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Climate change and fisheries

Climate change and fisheries examines the effects of anthropogenic warming on ocean and freshwater systems, including temperature rises, acidification, and shifts in circulation patterns, which alter fish distributions, body sizes, and productivity, thereby influencing global capture fisheries that supply about 17% of animal protein for human consumption.^[1] Observed empirical data reveal poleward migrations of many commercial species and reductions in maximum fish sizes by 5–29% in line with the temperature-size rule, driven by metabolic responses to warmer waters.^[2] These changes have contributed to a 4% decline in sustainable fish stocks since the 1930s, though overfishing remains the dominant pressure, depleting approximately one-third of assessed stocks and reducing ecosystem resilience to climatic stressors.^[3]^[4] Projections from ecosystem models suggest potential global declines in maximum catch potential of 3–10% by mid-century under moderate emissions scenarios, with tropical regions facing greater losses due to compressed habitat suitability, while higher latitudes may experience temporary gains.^[5] However, these forecasts incorporate uncertainties from model assumptions and do not fully account for adaptive management, such as reducing fishing pressure, which studies indicate could mitigate much of the projected impacts by enhancing stock resilience.^[6] Interactions with overexploitation amplify risks, as depleted populations exhibit lower adaptability to environmental shifts, underscoring the need for integrated approaches prioritizing sustainable harvest levels over isolated climate attributions.^[7] Controversies arise in attributing fishery declines primarily to climate versus human activities, with some analyses highlighting that ending overfishing would bolster marine systems against warming more effectively than emissions reductions alone.^[8]

Oceanographic and Environmental Changes

Ocean Warming and Heat Distribution

The oceans have absorbed more than 90% of the excess heat trapped in Earth's system due to anthropogenic greenhouse gas emissions, with measurements indicating a steady increase in global ocean heat content since the 1970s.^[9]^[10] This uptake is concentrated in the upper ocean layers, particularly the top 700 meters, where temperatures have risen consistently since the mid-20th century, as evidenced by multiple independent analyses of ship-based, Argo float, and satellite data.^[11] By 2023, the rate of ocean warming had more than doubled compared to earlier decades, with the upper ocean storing the majority of this heat and contributing to altered thermal profiles that influence habitat suitability for marine species.^[12] Rising subsurface and surface temperatures have intensified thermal stratification, where warmer, less dense surface waters form a stable layer over cooler, denser deeper waters, suppressing vertical mixing.^[13] This process reduces the exchange of heat, oxygen, and nutrients between surface and deeper layers, with observational data from buoys and floats showing increased stratification strength in regions like the subtropical gyres since the 1980s.^[14] Consequently, upwelling zones—critical for delivering nutrient-rich deep water to sunlit surface areas—experience diminished efficiency, as weakened vertical currents limit the replenishment of subsurface nutrients, altering the physical boundaries of productive habitats.^[15] Extreme events such as the record-breaking marine heatwaves of 2023–2024 have further unevenly distributed heat, with anomalies exceeding 1–2°C above climatological means across nearly 96% of the global ocean surface in 2023 alone.^[16] These heatwaves, driven by prolonged high sea surface temperatures, disrupted regional circulation patterns, including weakened coastal upwelling in areas like the Gulf of Alaska, where high-pressure systems inhibited nutrient transport.^[17] Such anomalies exacerbate stratification temporarily but can persist, reshaping subsurface heat distribution and compressing habitable thermal envelopes in equatorial and mid-latitude waters. Meta-analyses of temperature-driven habitat shifts indicate that suitable thermal ranges for fish species have migrated poleward at an average rate of approximately 72 km per decade, based on observations of distribution edges from 1970 onward.^[18] This redistribution reflects the physical advection of warmer waters equatorward in some basins alongside poleward expansion of isotherms, as tracked by satellite altimetry and in-situ thermography, thereby redefining the latitudinal extent of viable temperature gradients for schooling and spawning behaviors.^[19] In polar regions, accelerated subsurface warming—up to 0.5°C per decade in the Arctic—has begun eroding seasonal ice cover, exposing more surface area to heat absorption and homogenizing vertical temperature profiles.^[10]

Ocean Acidification from CO2 Absorption

Ocean absorption of atmospheric CO2 forms carbonic acid, reducing seawater pH and carbonate ion concentration, which lowers the saturation state (Ω) of calcium carbonate minerals essential for biogenic structures.^[20] Since the pre-industrial era (circa 1750), global surface ocean pH has declined by approximately 0.1 units, from about 8.2 to 8.1, corresponding to a 25-30% increase in hydrogen ion concentration and acidity.^[21] ^[20] Projections under high-emission scenarios (e.g., RCP8.5 equivalents) indicate an additional pH drop of 0.3-0.4 units by 2100, potentially reaching 7.8 in surface waters, with aragonite saturation states (Ω_ar) falling below 1 in many regions.^[22] ^[23] This acidification particularly impairs calcification in organisms reliant on aragonite (a less stable polymorph of CaCO3), as Ω_ar < 1 renders seawater undersaturated and corrosive to shells.^[24] In coastal upwelling zones, such as the California Current system, naturally low-Ω_ar waters (<1.5) are brought to the surface, exacerbating dissolution risks during seasonal events.^[25] Pteropods, planktonic mollusks forming aragonite shells, exhibit shell dissolution when Ω_ar drops below ~1.0, as observed in 2011 field samples from the U.S. West Coast where 40-50% of pteropod shells showed significant corrosion.^[26] ^[27] These pteropods serve as prey for commercial species like salmon and herring, potentially disrupting larval fish nutrition in affected food chains.^[28] Shellfish aquaculture faces direct threats, with larval stages most vulnerable due to energy costs of calcification under low pH. Pacific oyster (Crassostrea gigas) hatcheries in the U.S. Pacific Northwest experienced mass larval die-offs starting in 2005, peaking in 2008-2010, linked to upwelled waters with pH <7.8 and Ω_ar <1, causing 80% mortality in corrosive conditions versus near-zero in buffered waters.^[29] ^[30] Laboratory experiments confirm reduced shell growth and survival at pH 7.7-7.8, with field monitoring through 2020 showing recurrent events tied to aragonite undersaturation.^[31] ^[32] While some populations show partial resilience via genetic selection or buffering practices, empirical data indicate persistent risks to seed production for fisheries valued at hundreds of millions annually.^[33]^[34]

Deoxygenation and Nutrient Cycling Alterations

Ocean deoxygenation involves the progressive decline in dissolved oxygen concentrations across ocean layers, primarily resulting from reduced oxygen solubility in warmer waters and intensified stratification that impedes vertical mixing and downward oxygen transport. Empirical measurements reveal a global loss of approximately 2% in dissolved oxygen inventory since the 1950s, with subsurface waters exhibiting the most pronounced declines due to diminished replenishment from surface aeration.^[35] ^[36] Slower ocean circulation, linked to thermal expansion and density gradients, further restricts oxygen ventilation in intermediate and deep layers, compounding these effects through causal mechanisms independent of direct emissions.^[13] ^[37] Hypoxic zones—regions with oxygen levels below 2 mg/L—have expanded substantially, with open-ocean volumes quadrupling and coastal low-oxygen sites increasing tenfold since 1950, reflecting a decadal growth rate approximating 4-7% in affected areas based on reconstructed data.^[38] ^[36] In the Gulf of Mexico, seasonal hypoxia driven by stratification-enhanced eutrophication from nutrient runoff has intensified, with measured extents reaching over 6,700 square miles in 2024, surpassing long-term averages amid warmer conditions that curtail oxygen solubility.^[39] ^[40] Projections indicate tropical oceans, already prone to oxygen minima zones, could see minimum concentrations fall by 3-4% by 2100 under moderate emissions scenarios, as stratification compresses oxygenated habitable depths and circulation slowdowns persist.^[35] ^[41] These dynamics arise from first-principles thermodynamics—warmer waters hold less gas—and fluid dynamics limiting advective oxygen supply, with models consistently forecasting heightened subsurface depletion regardless of short-term variability.^[42] Alterations in nutrient cycling stem from enhanced upper-ocean stratification, which suppresses upwelling of deep-water nitrates and phosphates essential for phytoplankton, potentially curtailing surface primary productivity in equatorial and subtropical gyres.^[43] ^[44] Reduced circulation efficiency exacerbates this by trapping nutrients in deeper reservoirs, while coastal eutrophication from anthropogenic runoff amplifies local deoxygenation via organic matter remineralization, creating feedback loops that perturb basin-scale cycles.^[45] Observations confirm these shifts, with subsurface nutrient inventories rising in tandem with oxygen declines since the mid-20th century, signaling a reconfiguration of biogeochemical fluxes.^[46]

Biological and Ecological Responses

Species Distribution Shifts and Migration Patterns

Observed shifts in fish species distributions have been documented through fisheries catch records, trawl surveys, and tagging data, revealing predominantly poleward migrations in response to ocean warming. In the North Atlantic, for instance, the center of distribution for Atlantic cod (Gadus morhua) has shifted northward over the past century, with accelerated changes since the 1980s coinciding with rising sea surface temperatures. ^[47] Meta-analyses of marine fish range shifts indicate average poleward velocities of approximately 15-20 km per decade, varying by life stage and species; juvenile bony fish exhibit faster shifts (around 15 km per decade) compared to adults (about 3 km per decade). ^[48] These patterns are causally linked to thermal tolerance limits, where species track optimal temperature envelopes as isotherms move poleward. ^[49] Recent empirical tracking from 2023-2025 highlights disruptions in straddling stocks—fish populations that span exclusive economic zones (EEZs) and high seas—with climate-driven migrations increasing the proportion shifting into international waters. A 2025 global assessment projects that 37% of straddling stocks will experience significant redistributions between EEZs and high seas by mid-century under moderate emissions scenarios, with nearly all ocean regions affected as early as 2030; highly migratory species like tunas are particularly prone to crossing regional fisheries management boundaries. ^[50] These findings align with FAO reports on high seas resources, which note ongoing poleward expansions in subpolar assemblages based on vessel monitoring and acoustic survey data. ^[51] Projections indicate heterogeneous outcomes, with tropical and equatorial fisheries facing substantial losses in local abundance due to range contractions, while subpolar and temperate zones may see influxes. Models estimate up to a 40% decline in maximum catch potential for tropical EEZs by the 2050s under high-emission pathways (RCP8.5), driven by compressed habitable thermal ranges and reduced habitat suitability. ^[52] Conversely, high-latitude regions could experience 30-70% increases in potential yields from incoming species, though empirical validations from 2000-2025 observations confirm that actual catches lag projections due to overfishing confounding signals. Such shifts underscore the need for dynamic management, as static EEZ boundaries misalign with evolving stock geographies. ^[50]

Variations in Fish Growth, Reproduction, and Survival Rates

Fish species exhibit physiological responses to rising ocean temperatures primarily through elevated metabolic rates, as predicted by metabolic theory, which posits that temperature accelerates enzymatic reactions and energy demands, thereby influencing somatic growth, reproductive output, and mortality across life stages.^[53] Experimental and field studies demonstrate that warmer conditions increase standard metabolic rates by approximately 20-30% per 1°C rise, diverting energy from growth to maintenance and imposing constraints via oxygen supply limitations under the gill-oxygen limitation theory.^[54] These effects manifest unevenly by species and region, with tropical fishes showing greater sensitivity due to proximity to thermal optima. Under the temperature-size rule, ectothermic fishes grow faster at elevated temperatures but attain smaller adult sizes due to earlier maturation and resource allocation trade-offs, with observational data from global surveys indicating maximum body size reductions of 5-29% in many species over recent decades amid ~0.8-1°C surface ocean warming since 1980.^[2] For instance, modeling incorporating temperature-dependent bioenergetics reveals shifts toward smaller-bodied populations despite initial growth rate accelerations, as higher metabolic costs reduce energy for size accumulation.^[55] Such reductions, estimated at 20-30% per 1°C in controlled experiments on temperate species, compromise individual fitness and cohort productivity without compensatory adaptations.^[56] Reproductive phenology in fishes often advances with warming at rates exceeding those of prey phenologies, leading to trophic mismatches where spawning precedes peak plankton blooms essential for larval nutrition.^[57] Geographic spawners, which cue on temperature for spawning, exhibit phenological shifts twice as rapid as phytoplankton responses, resulting in larvae hatching 10-20 days early relative to food peaks in projections for 2050-2100 under moderate emissions scenarios.^[58] This desynchronization elevates larval starvation risks, as evidenced in Alaskan pollock where advanced spawning amid 1-2°C warming forecasts 15-25% declines in recruitment success due to bloom offsets.^[59] Survival rates, particularly for juveniles, decline in warmer waters owing to heightened metabolic stress, reduced aerobic scope, and increased predation vulnerability from altered swimming performance.^[60] Laboratory assays show juvenile mortality rising 10-50% at temperatures 2-3°C above optima, linked to oxygen debt and developmental anomalies, though field validations in heated streams confirm faster initial growth but cohort-level attrition from size-selective mortality.^[61] Counterexamples exist in species exhibiting phenotypic plasticity, such as Atlantic salmon (Salmo salar), where acclimation to 2-4°C elevations enhances cardiac morphology and thermal tolerance, mitigating up to 20% of survival deficits via within-generation adjustments.^[62] Nonetheless, plasticity's limits under rapid warming—exceeding 0.2°C/decade—may preclude full adaptation without genetic shifts.^[63]

Disruptions to Marine Food Webs and Biodiversity

Climate change induces cascading disruptions in marine food webs by altering physiological tolerances, species interactions, and trophic efficiencies across levels, often amplifying initial stressors like warming and acidification.^[64] These effects propagate from primary producers to top predators, reducing overall system productivity and altering energy flows, as evidenced by ensemble projections showing trophic amplification where higher-level biomass declines exceed those at the base.^[64] Regional variations occur, with equatorial zones facing steeper losses due to thermal stress, while some polar areas experience temporary productivity gains from nutrient mobilization, though global net effects remain negative.^[65] Ocean acidification weakens the planktonic foundation of food webs by impairing calcification in coccolithophores and pteropods, key prey for herbivores and forage fish, leading to reduced transfer efficiency to higher trophic levels.^[66] Experimental and modeling studies indicate that elevated CO2 levels restructure phytoplankton communities, favoring non-calcifying species like dinoflagellates over diatoms, which disrupts grazing dynamics and sinking carbon flux.^[67] Combined with warming, these changes can shift plankton dominance, diminishing nutritional quality for zooplankton and initiating trophic mismatches that cascade upward.^[68] At intermediate and higher trophic levels, disruptions manifest as shifts in keystone species dynamics, such as jellyfish blooms supplanting fish populations in altered ecosystems. In the Black Sea, recurrent jellyfish proliferations since the early 2000s have coincided with environmental changes, including warming, displacing planktivorous fish and altering predator-prey balances, though multifactorial causes like eutrophication contribute.^[69] Such invasions reduce biodiversity by outcompeting native species for resources, exemplifying how climate-driven tolerance shifts favor resilient, low-energy taxa like gelatinous zooplankton over metabolically demanding fish.^[70] Biodiversity metrics reveal projected global marine animal biomass reductions of approximately 5% per 1°C of warming, with models isolating temperature as the primary driver through metabolic suppression and habitat compression.^[64] These estimates account for trophic propagation, where primary production declines propagate to yield 2-3 times greater losses in fish and invertebrate biomass, though some models note variability from CO2-enhanced primary productivity in nutrient-limited gyres, often offset by acidification's inhibitory effects on calcifiers.^[71] Empirical observations from 1990-2020 corroborate directional declines in biodiversity hotspots, with species richness dropping in warming hotspots due to homogenized assemblages.^[72] Ecological network models assess food web resilience by quantifying connectivity and stability under climate perturbations, revealing tipping points where incremental stressors trigger abrupt regime shifts, such as from fish- to jellyfish-dominated states.^[73] Highly connected networks exhibit greater short-term resilience via functional redundancy, but chronic forcing erodes this by synchronizing population fluctuations, increasing vulnerability to collapses; projections indicate such thresholds could be crossed with 2-3°C warming in vulnerable basins.^[74] These frameworks underscore causal realism in disruptions, emphasizing that biodiversity loss reduces buffering capacity, amplifying propagation of base-level changes to apex predators.^[75]

Impacts on Fish Stocks and Capture Fisheries

Projected Declines in Tropical and Equatorial Regions

Ensemble projections from global marine ecosystem models indicate that maximum catch potentials in tropical and equatorial regions could decline by 20-35% by 2100 relative to 1980-2010 baselines under high-emissions scenarios like RCP8.5, with stronger losses at higher trophic levels due to compounded effects of warming, deoxygenation, and reduced primary productivity.^[76]^[64] These declines arise from thermal stress exceeding physiological tolerances, where elevated temperatures accelerate metabolic demands while decreasing oxygen solubility and aerobic scope, thereby constraining fish growth, reproduction, and habitat suitability in already warm waters.^[64] Model ensembles incorporating species-specific responses and oceanographic drivers consistently highlight tropical hotspots, such as the equatorial Pacific and Indian Oceans, as facing the most severe reductions in biomass and yield potential compared to higher latitudes.^[76] Empirical evidence supports these projections, particularly in regions prone to warming events like El Niño-Southern Oscillation (ENSO), which are intensifying under anthropogenic climate change. In Peru's anchovy fishery, a key tropical stock, sea surface temperatures during the 2023 El Niño episode exceeded thresholds for optimal upwelling and larval survival, leading to the cancellation of the northern fishing season in April-May and a sharp drop in landings to under 300,000 metric tons for the year—less than half of prior averages—exacerbating supply shortages for fishmeal.^[77]^[78] Statistical analyses confirm negative correlations between sea surface temperature anomalies and anchoveta catch per unit effort, with warming disrupting nutrient cycling and prey availability, mirroring broader model-predicted vulnerabilities in equatorial upwelling systems.^[78] These patterns reflect causal mechanisms rooted in biophysical limits: in tropical oceans, baseline temperatures near species' upper thermal limits leave little buffer for further warming, reducing carrying capacity as stratification inhibits vertical mixing and nutrient replenishment, while hypoxia zones expand and compress viable habitats.^[64] Validation against historical data, such as observed declines in West African small pelagic stocks from 2010-2020 aligning with ensemble hindcasts, underscores the reliability of these forward projections despite uncertainties in emission trajectories and adaptation.^[79] Overall, tropical fisheries face heightened risks, with potential catch losses amplifying food insecurity in dependent nations unless emissions are curtailed.^[76]

Opportunities for Expansion in Polar and Temperate Zones

In high-latitude regions, warming oceans have enabled boreal fish species to expand northward, increasing habitat suitability and primary production in areas previously limited by ice cover and cold temperatures. This has created opportunities for enhanced fisheries yields in polar and temperate zones, particularly through longer growing seasons and reduced seasonal constraints on plankton blooms.^[80]^[81] Projections indicate significant catch potential gains in the Nordic Seas, with models estimating up to a 29% increase by mid-century under moderate climate scenarios, driven by elevated zooplankton production in northern subregions and influxes of temperate species like mackerel and herring. In the Barents Sea, bottom temperatures rose by approximately 1°C from the 1990s to 2012, correlating with a decline in sea ice from 33% to 12% coverage and northward shifts of commercially viable boreal species such as cod and haddock, whose total stock biomass reached near-record levels of 3.6 million tonnes for cod by 2013.^[81]^[82] Empirical observations confirm these trends, as warming has boosted overall fish biomass in the Barents Sea through heightened primary productivity, with boreal invaders displacing less productive Arctic endemics and supporting sustained harvests of high-latitude stocks by Norwegian and Russian fleets.^[83]^[84] Similarly, in the eastern Bering Sea, Alaskan pollock populations have exhibited increased mixing and northward extensions into the Chukchi Sea since the 2010s, linked to sea ice retreat and temperature anomalies, positioning sub-Arctic zones for potential yield expansions absent excessive fishing pressure.^[85] These dynamics underscore localized productivity uplifts amid broader distributional upheavals, though Arctic specialist species face contraction risks.^[84]

Empirical Evidence from Historical and Recent Observations (2000-2025)

Global capture fisheries production has exhibited relative stability from 2000 to 2022, fluctuating annually between 86 million and 93 million tonnes, as reported by the Food and Agriculture Organization (FAO).^[86] This trend persists despite modeled expectations of substantial declines from ocean warming and associated stressors, highlighting a discrepancy between projections and empirical landings data.^[87] FAO assessments attribute much of the observed variability to management practices and exploitation levels rather than climatic factors alone, with overfished stocks comprising about 35% of global marine fisheries in recent years.^[86] In regional freshwater systems, such as lakes in the Midwestern United States, field studies from 2023 to 2025 demonstrate that harvest pressure exceeds the influence of warming on population dynamics. A University of Wisconsin analysis of walleye and other species in Wisconsin and Minnesota lakes found fishing mortality to be the dominant driver of abundance changes, outpacing temperature effects even amid observed lake warming trends.^[88]^[89] Similarly, time-series data from these systems indicate that recreational and commercial harvest rates correlate more strongly with biomass reductions than do thermal shifts.^[90] Historical stock assessments reveal that many fishery declines originated in the 1970s, linked to intensified industrial harvesting that halved global ocean fish biomass by the 1980s through overexploitation, well before the acceleration of anthropogenic warming post-1990.^[91]^[87] This temporal precedence underscores overfishing as a primary causal factor in pre-2000 depletions, with climate influences emerging later but often overstated relative to ongoing extraction pressures in attribution analyses.^[8] Recent high-seas observations, including shifts in transboundary stocks like tuna, show distributional changes toward international waters, but empirical catch records from 2000 to 2025 indicate these movements align more with fleet dynamics and quota adjustments than solely with thermal displacements.^[92] Such patterns challenge narratives of imminent climate-driven collapse, as total high-seas yields have held steady amid these transitions.^[93] Overall, time-series evidence from 2000 to 2025 emphasizes realized impacts falling short of modeled severity, with exploitation consistently ranked as the leading depleter across datasets.^[86]^[87]

Interactions with Anthropogenic Pressures

Overfishing's Dominant Role in Stock Depletion

Global assessments indicate that approximately 35.5% of monitored fish stocks were overfished in recent years, with exploitation levels exceeding maximum sustainable yields, primarily due to excessive harvesting pressures rather than climatic factors.^[94] This overfishing has led to widespread stock depletions, as evidenced by historical cases where collapses occurred well before significant anthropogenic warming trends intensified in the late 20th century. For instance, the North Sea herring stock plummeted from over 14 million tonnes in the 1950s to less than 0.1 million tonnes by the early 1970s, attributed mainly to intensive fishing rather than temperature shifts.^[95]^[96] Stock assessments further demonstrate that reducing fishing mortality can enable recoveries, underscoring overexploitation's reversible nature compared to climatic stressors. In the U.S. Northeast, groundfish stocks such as haddock on Georges Bank showed signs of nascent recovery following quota implementations and reduced effort post-2000, with biomass increases tied directly to management curbing overfishing.^[97] Similarly, Atlantic cod in New England began rebounding after decades of depletion, with strict quotas post-overfishing era allowing population stabilization despite ongoing environmental challenges.^[98] Comparative analyses quantify overfishing's outsized influence relative to warming. A 2025 University of Wisconsin study modeling 521 freshwater fish populations found that fishing exerted a more pronounced effect on dynamics than temperature rises for 92% of cases, with overexploitation driving declines 2-3 times more severely in many scenarios.^[99] These metrics highlight that harvest rates, not thermal variability, dominate depletion risks in managed fisheries, as evidenced by persistent overfished proportions despite gradual ocean warming.^[89] Such patterns affirm overfishing's precedence in causal chains leading to stock vulnerability.

Cumulative Effects with Habitat Loss and Pollution

Bottom trawling and other destructive fishing practices physically alter seafloor habitats, compounding climate-driven changes such as ocean warming and acidification that squeeze species into narrower thermal ranges. These gears scrape and resuspend sediments, reducing benthic biodiversity and structural complexity essential for fish recruitment and foraging, with disturbance affecting 48-53% of assessed seabed areas in the North-East Atlantic from 2016 to 2020.^[100] Such mechanical disruption diminishes habitat resilience to warming-induced stressors like coral bleaching or range contractions, as damaged substrates offer fewer refugia for juveniles, amplifying mortality rates beyond what thermal stress alone predicts. Peer-reviewed assessments emphasize that repeated trawling cycles—often annual in high-effort zones—erode recovery potential, creating feedback loops where degraded habitats trap heat and sediments, further stressing fish assemblages.^[101] Nutrient pollution from agricultural runoff and coastal development synergizes with climate effects by inducing hypoxia, which lowers dissolved oxygen levels and narrows species' physiological tolerances already compressed by warming. Eutrophication fuels algal blooms that deplete oxygen upon decay, interacting with temperature-driven metabolism increases to create "dead zones" intolerable for many demersal and pelagic fish; for instance, in the western Baltic Sea, warming has exacerbated oxygen depletion in deeper waters during the 2020s, with nutrient loads sustaining hypoxic events that halved cod recruitment in affected areas.^[102] Plastic pollution adds toxicity and ingestion risks, reducing foraging efficiency and reproductive success in ways that amplify warming's sublethal impacts on growth, as evidenced by laboratory and field studies showing combined exposure elevates stress responses in fish beyond additive predictions.^[103] These interactions underscore multifactorial causation, where pollution's direct habitat impairment often dominates short-term declines, while climate modulates long-term vulnerability. Empirical observations prioritize habitat loss and pollution as primary variance drivers in fish stock reductions, frequently outweighing isolated warming signals in non-reef systems. In temperate and shelf fisheries, physical habitat degradation from trawling and sedimentation explains up to 50% of observed biomass declines in targeted species, compared to 10-20% attributable to temperature anomalies alone, based on multivariate models integrating catch data and environmental covariates from 2000-2020.^[104] Coral reef fish assemblages show similar patterns post-disturbance events, with structural habitat loss correlating to 60-70% density drops across trophic groups, whereas thermal variance contributes secondarily through altered behaviors.^[105] This causal hierarchy, drawn from time-series analyses rather than projections, highlights over-reliance on climate attribution in policy as potentially overlooking actionable local stressors like gear impacts, which exhibit stronger correlations with empirical stock trajectories in regions like the Baltic and North Sea.^[106]

Bidirectional Links: Fisheries Emissions Contributing to Climate Forcing

The fishing sector contributes to climate forcing through direct greenhouse gas (GHG) emissions primarily from fuel combustion in vessels, accounting for approximately 0.5% of total global anthropogenic GHG emissions or up to 159 million tonnes of CO₂ annually from industrial fleets in the mid-2010s.^[107] ^[108] These emissions have risen over time, with global CO₂ from marine fisheries fuel increasing from 56 million tonnes in 1950 to 207 million tonnes in 2016, driven largely by the expansion of industrial-scale operations.^[108] Small-scale fisheries emit less per unit but collectively add to the footprint, with fuel use intensity varying by gear type and region.^[109] Beyond fuel combustion, bottom-contact fishing methods such as trawling and dredging disturb seabed sediments, resuspending and releasing organically bound carbon that has accumulated over centuries, thereby amplifying radiative forcing. A 2024 analysis estimated that global bottom trawling alone mobilizes 0.55–1.10 gigatonnes of CO₂-equivalent per year through physical disturbance and enhanced microbial oxidation, with 55–60% of disturbed carbon potentially entering the atmosphere—levels comparable to aviation's annual emissions of around 1 gigatonne.^[110] This process creates a feedback loop, as released carbon contributes to atmospheric CO₂ buildup, though estimates remain uncertain due to variability in sediment carbon content and resuspension dynamics, with some critiques questioning the full atmospheric transfer rate.^[111] Fisheries activities also impair blue carbon ecosystems—mangroves, seagrasses, and salt marshes—which sequester CO₂ at rates 5–10 times higher per unit area than tropical forests, storing up to 1,000 tonnes of carbon per hectare in sediments.^[112] ^[113] Dredging for port access and trawling in coastal zones degrade these habitats, reducing sequestration potential by disrupting root systems and sediment stability; for instance, mobile bottom fishing can diminish seabed organic carbon stores, limiting the ocean's overall carbon sink capacity.^[114] Such disturbances threaten the long-term stability of these sinks, which globally hold petagrams of carbon despite occupying less than 1% of ocean area.^[115]

Socioeconomic and Global Implications

Vulnerabilities in Coastal and Small-Scale Fishing Communities

Coastal and small-scale fishing communities, which dominate in developing nations comprising about 90% of global fisheries employment, exhibit elevated vulnerability to climate-driven alterations in local fish distributions and productivity. These groups rely heavily on nearshore resources for livelihoods and nutrition, with limited capital for relocation or diversification, amplifying exposure to reduced catch potentials in tropical zones projected to decline by up to 50% by 2100 under moderate emissions scenarios.^[116] ^[117] Empirical assessments in regions like Central Vietnam reveal moderate overall vulnerability levels, characterized by high exposure to storms and wind shifts but moderated by social networks and traditional knowledge.^[118] In Pacific Island Countries, tuna-dependent small-scale fisheries face acute risks from species migrations toward higher latitudes and international waters, potentially diminishing exclusive economic zone yields by 37% or more by 2030 across climate scenarios.^[119] Between 2020 and 2024, some communities mitigated income shortfalls through diversification into tourism, leveraging natural assets to supplement fishery revenues amid stock shifts, though this strategy contends with parallel climate threats like coral degradation affecting both sectors.^[120] ^[121] Adaptive capacity in these communities is bolstered by management innovations such as individual transferable quotas (ITQs), which foster resilience by curbing overcapacity and enabling stable harvest planning, as evidenced in OECD analyses of sustainable practices reducing operational inefficiencies.^[122] ^[123] Case studies from Mexico and Uruguay demonstrate transformative adaptations, including gear modifications and family-based diversification, yielding stronger responses among fishers with prior exposure to variability.^[124] ^[125] Globally, despite localized pressures, aquatic animal protein supply per capita has risen approximately 40% since 2000, from 14.3 kg to 20.2 kg, primarily via aquaculture offsetting wild capture constraints in vulnerable areas.

Effects on Global Food Security, Trade, and Protein Supply

Fish provides approximately 15 percent of global animal protein intake and 6 percent of total protein consumed worldwide, serving as a critical nutrient source for billions, particularly in regions with limited access to other animal proteins.^[126] Climate-driven range shifts in fish stocks are projected to redistribute supply toward higher latitudes, potentially reducing yields in tropical exclusive economic zones (EEZs) while increasing potential catches in temperate and polar regions.^[119] This latitudinal compression of production could exacerbate nutritional vulnerabilities in equatorial developing nations, where fish constitutes up to 50 percent of animal protein in some coastal populations, though empirical data from 2000–2022 indicate stable per capita supply at around 20 kg annually despite warming trends.^[127] International trade in seafood, valued at over $160 billion annually, faces disruptions from these shifts, as poleward migrations increase the proportion of straddling and highly migratory stocks transitioning from national EEZs to the high seas. Projections indicate that by 2030, at least 37 percent of such stocks will shift, rising to over 50 percent by 2050 under moderate warming scenarios, complicating enforcement of quotas and access rights in international waters.^[119] Net importers like Japan, reliant on imports for 40–50 percent of seafood consumption, may encounter higher costs and supply volatility if tropical exporters in Southeast Asia and West Africa experience yield declines of 10–30 percent in their EEZs, while high-seas fishing intensifies competition from distant-water fleets.^[93] Despite these challenges, global aquatic protein supply remains projected to grow modestly through 2034, reaching approximately 205 million tonnes, primarily due to aquaculture expansion offsetting stagnation in wild capture fisheries, which have plateaued at around 90–95 million tonnes since the 1990s.^[128] Aquaculture now accounts for over 50 percent of total production for human consumption, with its growth—driven by species like tilapia, salmon, and shrimp—expected to add 10–12 percent to overall output by 2032, mitigating climate impacts on wild stocks and supporting stable per capita availability.^[129] This trend underscores aquaculture's role in buffering food security risks, though its sustainability depends on addressing feed sourcing and environmental externalities independent of climatic forcing.^[127]

Economic Projections and Regional Disparities

Economic projections for fisheries under climate change indicate substantial global revenue risks, with models estimating annual losses of approximately $10 billion by 2050 if emissions continue unchecked.^[130] These estimates derive from simulations integrating species redistribution, productivity changes, and price adaptations, projecting a potential 35% decline in revenues relative to baseline scenarios without mitigation.^[131] However, high-latitude regions may experience biomass gains from poleward shifts in fish stocks, potentially offsetting losses in equatorial areas, though translating catch increases into revenue depends on market prices for newly abundant species, which are often lower-value.^[131] Regional disparities highlight winner-loser dynamics, with tropical and equatorial fisheries facing the steepest declines, projected at 20-30% or more in seafood production and associated GDP contributions in vulnerable exclusive economic zones.^[132] In contrast, temperate and polar zones, including parts of Russia and Norway, could see expanded opportunities from warmer waters enabling higher yields of commercial species like cod and haddock.^[131] Recent data from 2023-2025 in the European Union demonstrate adaptation through fleet modernization and stock management, yielding net positive economic performance in northern member states, where revenues grew amid recovering stocks and reduced operating costs.^[133]^[134] Cost-benefit analyses emphasize that while climate-driven shifts contribute to these projections, historical overcapacity and overfishing explain a larger share of current stock depletions than temperature changes alone, suggesting that management reforms could mitigate projected losses more effectively than climate mitigation in the near term.^[135] Disentangling these factors reveals that fishing pressure has historically amplified vulnerabilities, underscoring multifactor causal realism in economic outlooks.^[135]

Adaptation and Resilience Measures

Technological and Operational Innovations in Harvesting

Technological advancements in selective fishing gear have improved targeting precision, reducing bycatch and enabling fishers to adapt to climate-induced shifts in species distributions by minimizing ecosystem disruptions and waste. In U.S. longline fisheries, replacing wire leaders with monofilament versions decreased shark bycatch by about 41% while preserving catch rates of target species like swordfish.^[136] Similarly, larger circle hooks in Southeast hook-and-line operations reduced bycatch of undersized red snapper by over 70%, as documented in NOAA's Bycatch Reduction Engineering Program evaluations.^[137] These gear modifications, often incentivized by market premiums for sustainable sourcing, promote stock recovery and operational resilience without mandating reduced effort.^[138] Integration of AI-driven electronic monitoring (EM) systems has enhanced real-time catch verification and location tracking, supporting efficient harvesting amid variable ocean conditions. NOAA Fisheries implemented EM with AI-assisted species identification in West Coast groundfish limited-entry trawl fisheries starting January 2024, automating discard accounting and enabling data-informed adjustments to fishing patterns.^[139] Pilots incorporating camera feeds and machine learning algorithms, such as those explored for tuna fisheries, achieve over 90% accuracy in classifying catch, reducing human error and compliance costs for operators.^[140]^[141] Combined with satellite-derived vessel monitoring systems, these tools allow industry participants to optimize routes based on environmental cues like temperature anomalies, fostering proactive responses to range expansions or contractions.^[142] Hybrid diesel-electric propulsion retrofits in commercial fishing vessels deliver fuel efficiency improvements of 20-30%, driven by battery buffering during low-load phases like trawling or steaming. In Alaska longline operations, hybrid configurations yielded savings of 25-61% on multi-day voyages, depending on diesel-electric ratios, as modeled by NREL assessments.^[143] Industry trials in Indonesia confirmed up to 25% fuel reductions and proportional CO2 cuts with hybrid systems on small-to-medium trawlers.^[144] These voluntary upgrades, motivated by volatile fuel prices, extend vessel range to access relocated stocks, enhancing profitability and reducing vulnerability to climate variability without external subsidies.^[145]

Management Reforms Including Property Rights and Quotas

Individual transferable quotas (ITQs), a form of rights-based management, assign fishermen secure shares of total allowable catch (TAC), incentivizing conservation over short-term overexploitation. New Zealand pioneered comprehensive ITQs in 1986 for 26 major commercial species, covering about 90% of its deepwater catch and significant inshore fisheries, which shifted management from effort controls to output limits aligned with maximum sustainable yield (MSY). This system stabilized many stocks by reducing the "race to fish," enabling TAC adjustments based on stock assessments, with 94% of assessed stocks above hard biomass limits by 2016 and 83% above soft limits. For instance, the hoki fishery rebuilt to above MSY levels post-2004 through conservative TACs, despite ongoing environmental pressures including ocean warming.^[146]^[147] Australia has applied ITQs selectively since the 1980s in fisheries like southern rock lobster and abalone, contributing to stock stabilization and economic efficiency, though coverage remains partial compared to New Zealand. Empirical analyses indicate ITQs promote biomass recovery by aligning incentives with long-term productivity, with global reviews showing improved stock status in rights-based systems versus traditional input controls. In climate contexts, these mechanisms buffer variability by encouraging adaptive TAC revisions and reduced discarding, as quota holders bear the cost of stock declines; for example, New Zealand's framework has sustained 99% of assessed harvest from stocks above critical biomass thresholds amid rising sea temperatures. However, not all stocks achieve targets—29% remain below management goals, highlighting limits where assessments lag or recreational pressures persist.^[148]^[149] Internationally, tuna regional fisheries management organizations (RFMOs) have incorporated quota-like harvest control rules since the 2010s, with reforms accelerating post-2010 to address overcapacity. Five major tuna RFMOs adopted or strengthened total allowable catches and allocation formulas by 2020, aiming for MSY proxies, yet enforcement gaps persist on the high seas, where illegal, unreported, and unregulated (IUU) fishing evades monitoring; only partial implementation of the 2009 FAO Port State Measures Agreement hinders compliance. By 2025, priorities include mandatory electronic monitoring and fish aggregating device (FAD) management to enhance traceability, but flag state non-cooperation and vessel reflagging undermine effectiveness, allowing continued depletion despite quota frameworks. Rights-based elements in RFMOs, such as vessel day schemes, have shown preliminary resilience gains by curbing excess effort, per compliance audits, though full property rights remain rare in transboundary stocks.^[150]^[151]^[152]

Expansion of Aquaculture and Alternative Protein Sources

Aquaculture production exceeded wild capture fisheries for the first time in 2022, reaching 130.9 million tonnes compared to 91 million tonnes from capture, accounting for 59% of total aquatic animal production globally.^[153] This shift reflects sustained annual growth rates of around 5% for aquaculture since the early 2000s, driven by intensive farming of species tolerant to variable environmental conditions.^[126] Asia dominates this expansion, contributing approximately 90% of global output, with countries like China, India, and Indonesia leading through pond-based systems for finfish and shellfish.^[154] Tilapia, prized for its rapid growth and adaptability to freshwater and brackish systems, exemplifies resilient species farmed extensively in the region, with Asia producing over 70% of the world's 6 million tonnes in recent years.^[155] Land-based recirculating aquaculture systems (RAS) represent a key innovation to circumvent ocean-dependent vulnerabilities such as warming waters and acidification. These closed-loop facilities recycle up to 99% of water through biofiltration and temperature control, enabling year-round production in controlled environments.^[156] The RAS market has expanded from approximately $5.2 billion in 2023 to a projected $9 billion by 2031, indicating scaled adoption for high-value species like salmon and trout, particularly in North America and Europe where ocean site limitations persist.^[157] Such systems reduce exposure to marine pathogens and climate variability, though high energy demands and capital costs—often exceeding $10 per kilogram of production capacity—limit widespread deployment to premium markets.^[158] Cellular agriculture, involving the cultivation of fish cells in bioreactors, emerges as a synthetic alternative to supplement traditional protein sources amid rising demand projected to increase global fisheries and aquaculture output to 212 million tonnes by 2034.^[128] Early commercial pilots for cell-based seafood, such as salmon and tuna, demonstrate feasibility, with the broader cellular agriculture market valued at $226 million in 2024 and forecasted to reach $545 million by 2030 at a 15.7% compound annual growth rate.^[159] While scalability challenges like nutrient media costs and regulatory approvals remain, proponents argue it could alleviate pressure on overexploited stocks by providing nutrient-equivalent proteins without habitat dependency, though actual market penetration in fisheries remains below 1% as of 2025.^[160] Projections for cell-based seafood suggest potential growth to over $500 million in value by the late 2020s, contingent on cost reductions to compete with farmed equivalents.^[161]

Controversies, Uncertainties, and Debates

Reliability of Climate Models for Fisheries Projections

Climate models employed in fisheries projections, such as those from CMIP6 ensembles, integrate oceanographic variables like temperature, oxygen levels, and primary production to forecast shifts in fish distributions and biomass. These models often rely on Shared Socioeconomic Pathways (SSPs) to simulate future scenarios, yet projections for fisheries outcomes exhibit substantial variability, with differences across SSPs reaching 50-100% in regional biomass estimates due to divergent assumptions about emissions, adaptation, and ecosystem responses. ^[162] Downscaling global climate outputs to local scales for fisheries management introduces further errors, comparable in magnitude to uncertainties from the global climate models themselves, as regional processes like upwelling and nutrient cycling are poorly resolved.^[163] This compounding uncertainty limits the precision of projections for specific stocks, where species distribution models can contribute up to 70% of total variance, exceeding even earth system model discrepancies.^[164] Validation against empirical data reveals gaps in model performance for tropical fisheries, where CMIP6 simulations frequently project pronounced declines in primary production and biomass under warming scenarios, but observed trends from 2010 to 2024 indicate relative stability in many stocks amid ongoing pressures.^[165] ^[166] For example, global analyses of net primary production show models underestimating observed declines in some ocean basins, yet overestimating sensitivity to stratification changes in tropical regions, leading to risks of inflated decline projections.^[167] ^[168] These discrepancies arise from parameterized processes like phytoplankton dynamics, which lack direct observational constraints over decadal scales relevant to fisheries. Short-term forecasting challenges further undermine confidence in long-term extrapolations. Seasonal predictions for events like the 2023 global marine heatwaves, which impacted fish distributions, exhibited errors in intensity and regional extent, with models struggling to capture rapid onset driven by unmodeled feedbacks.^[169] ^[170] Such empirical gaps highlight the limitations of applying models tuned to historical averages to chaotic, multifactor systems like fisheries, where validation horizons are short relative to century-scale projections, amplifying risks of overprediction in tropical declines.^[171] Overall, while CMIP6 advances physical realism, persistent structural uncertainties necessitate cautious interpretation for policy, prioritizing ensemble spreads over point estimates.^[172]

Debates on Causal Attribution Versus Multifactor Explanations

Some researchers attribute a substantial portion of fishery declines to climate-driven factors, such as ocean warming and extreme events, with projections estimating that temperature changes could explain 20-40% of catch reductions in certain regions by mid-century.^[3] ^[8] However, these claims often rely on models that isolate climate signals amid confounding variables, and empirical data reveal limited evidence for dominant causal roles, as global wild capture fisheries production has remained stable at around 90-95 million tonnes annually since the 1990s despite observed warming.^[87] Skeptical analyses emphasize multifactor drivers, particularly overfishing and pollution, as primary contributors to stock depletions, with international assessments identifying overexploitation as the leading human-induced cause affecting roughly 35% of evaluated global stocks as of 2022. Overfishing has depleted biomass in iconic cases like North Atlantic cod, where harvests exceeded sustainable levels for decades prior to accelerated warming, reducing populations by up to 90% through direct harvesting pressure rather than thermal stress alone.^[87] Pollution and habitat loss from coastal development further exacerbate declines, accounting for localized losses in estuaries and reefs that predate recent climate trends.^[173] Natural variability complicates attribution, as multidecadal oscillations like the Atlantic Multidecadal Oscillation (AMO) drive basin-scale shifts in sea surface temperatures and plankton productivity, influencing recruitment and distribution independently of anthropogenic forcing.^[174] During positive AMO phases from the 1990s to 2010s, enhanced North Atlantic productivity boosted certain pelagic stocks, masking potential warming effects, while reconstructions spanning 2000-2025 demonstrate how such cycles explain interannual fluctuations better than linear temperature trends in regions like the Gulf of Maine.^[175] ^[176] This variability underscores causal realism, where isolating climate signals requires disentangling oscillatory modes that have historically dominated fishery dynamics over centuries.^[177] Critics of high climate attribution note systemic biases in academic modeling, where assumptions of linearity overlook management reforms that have stabilized yields; for example, quota reductions in the European Union since 2000 correlate more strongly with biomass recovery than temperature metrics.^[178] In contrast, alarmist narratives may overstate extremes' roles, as evidenced by persistent declines in overfished stocks like Pacific mackerel amid stable regional temperatures, pointing to harvest controls as the pivotal factor.^[179] Empirical prioritization of overexploitation aligns with first-principles assessments of population dynamics, where exceeding maximum sustainable yield predictably erodes resilience more than gradual warming in well-documented cases.^[180]

Critiques of Policy Responses and International Agreements

Critiques of international agreements under the UNFCCC, including the Paris Agreement, center on their vagueness regarding fisheries-specific climate impacts, such as transboundary stock migrations, with frameworks like UNCLOS providing limited actionable guidance for management amid shifting distributions.^[181] The Paris Agreement emphasizes broad emission limits but lacks enforceable mechanisms tailored to marine sectors, potentially overlooking fisheries' role in food security and economic stability in vulnerable regions.^[182] Similarly, FAO-led efforts, such as analyses of nationally determined contributions, identify gaps in integrating fisheries into climate plans, with food insecurity risks noted in 88% of plans yet insufficient targeted actions.^[183] Adaptation funds linked to these agreements face efficiency challenges, as evidenced by UNEP's 2024 report highlighting slow progress in closing financing gaps, where flows remain inadequate relative to needs in developing nations reliant on fisheries.^[184] Audits and reviews, including those from the Global Center on Adaptation, indicate that adaptation finance to high-risk areas like Africa grew only 14% from 2019–2020 levels, often hampered by bureaucratic allocation rather than direct impact measurement.^[185] Government subsidies totaling approximately $35 billion annually worldwide, with over $22 billion classified as harmful, perpetuate fleet overcapacity and overfishing, reducing sector resilience to climate stressors by incentivizing exploitation over sustainable yields.^[186] ^[187] These top-down interventions distort markets, delay reforms like capacity reductions, and exacerbate vulnerabilities, as critiqued in WTO negotiations aiming to curb subsidies contributing to overfished stocks.^[188] Bilateral arrangements, such as U.S.-Canada fisheries treaties, demonstrate greater flexibility for adaptive management compared to multilateral pacts, enabling targeted cooperation on shared stocks amid environmental changes.^[189] Market mechanisms, including subsidy reforms and rights-based approaches, are advocated over rigid mandates, as they foster incentives for innovation and efficiency in building resilience, per analyses of adaptive systems.^[190] ^[191]

References

[1]
Global fish production and climate change - PNAS
Global fish production is forecast to increase more slowly than demand to 2020, and the proportion of production coming from aquaculture is forecast to increase ...Global Fish Production And... · Present Fisheries Production... · Evidence Of Climate Impacts<|control11|><|separator|>
[2]
Impacts of ocean warming on fish size reductions on the world's ...
Jul 1, 2024 · In accordance with the Temperature-Size rule, the maximum size of many fishes has already declined by 5–29% over the last few decades as a ...
[3]
Ocean warming has caused 'sustainable' fish stocks to drop by 4 ...
Feb 28, 2019 · The study finds that, out of the 235 fish populations, 19 (8%) have been “significantly” negatively impacted by ocean warming and 9 (4%) have ...
[4]
End Overfishing and Increase the Resilience of the Ocean to ...
Ending overfishing and reducing other negative ecosystem effects of fishing would make fish stocks and marine ecosystems more resilient to climate change.
[5]
[PDF] Redistribution of Fish Catch by Climate Change | Sea Around Us
Climate change causes fish to shift to higher latitudes and deeper waters, with catch increasing at higher latitudes and decreasing in the tropics, potentially ...
[6]
Realistic fisheries management reforms could mitigate the impacts ...
Overall, our results indicate that climate change will dramatically alter the distribution and productivity of marine fisheries, but plausible climate-adaptive ...
[7]
Impact of Ocean Warming, Overfishing and Mercury on European ...
Feb 6, 2022 · Overfishing makes marine fisheries production more vulnerable to ocean warming by compromising the resilience of many marine species to climate ...
[8]
Good fisheries management is good carbon management - Nature
Mar 21, 2024 · Overfishing and associated habitat degradation have put many fish populations and marine ecosystems at risk and is making the ocean more ...
[9]
Climate Change: Ocean Heat Content
More than 90 percent of the excess heat trapped in the Earth system due to human-caused global warming has been absorbed by the oceans. NOAA Climate.gov graph, ...
[10]
Ocean Heat Content Rises | News
Jan 22, 2020 · Scientists have determined that the ocean absorbs more than 90 percent of the excess heat, which is attributed to greenhouse gas emissions. The ...
[11]
Climate Change Indicators: Ocean Heat | US EPA
Aug 12, 2025 · In four different data analyses, the long-term trend shows that the top 700 meters of the oceans have become warmer since 1955 (see Figure 1).
[12]
Fifty Year Trends in Global Ocean Heat Content Traced to Surface ...
Apr 11, 2021 · The global ocean has absorbed approximately 90% of the excess heat in the climate system since 1970 (Schuckmann et al., 2020), impacting ...2 Theory · 4 Results · 5 Discussion And Conclusions
[13]
Three decades of ocean warming impacts on marine ecosystems
This increase in the upper ocean water column stratification decreases the vertical mixing or overturning of the surface waters, reducing the supply of ...
[14]
Future changes in coastal upwelling ecosystems with global warming
Feb 12, 2018 · This increase in stratification could potentially decrease the upward transport of nutrients by vertical mixing (Fig. 2b). However, enhanced ...
[15]
Climate change impacts to upwelling and shallow reef nutrient ...
Sep 5, 2025 · Crucially, climate change is disrupting patterns of upwelling by increasing ocean stratification (Li et al. 2020), driving spatial changes in ...
[16]
Record marine heat waves in 2023 covered 96% of oceans, lasted ...
Jul 25, 2025 · The mean marine temperature was 1.3°C above normal in 2023, compared to the average of 0.98°C above normal. They also found that the average ...
[17]
Marine heatwaves disrupt ocean circulation and nutrient distribution ...
Nov 12, 2024 · Marine heatwaves create high-pressure atmospheric conditions that weaken coastal circulation in the Gulf of Alaska, reducing the formation ...<|separator|>
[18]
Responses of Marine Organisms to Climate Change across Oceans
Marine organisms have, on average, expanded the leading edges of their distributions by 72.0 ± 13.5 km per decade (generally polewards), while marine phenology ...
[19]
(PDF) Temperature change effects on marine fish range shifts
May 31, 2023 · While poleward responses increased with rate of temperature change and latitude, niche was a key factor in predicting both depth (18% of ...
[20]
Ocean acidification | National Oceanic and Atmospheric Administration
Sep 25, 2025 · During this time, the pH of surface ocean waters has fallen by 0.1 pH units. This might not sound like much, but the pH scale is logarithmic, so ...
[21]
Global Surface Ocean Acidification Indicators From 1750 to 2100
Mar 23, 2023 · From 1750 to 2000, the average pH of the global surface ocean decreased by ∼0.11 units, equivalent to an acidity increase of ∼30% (Caldeira & ...
[22]
Ocean Acidification: Present Conditions and Future Changes in a ...
Oct 2, 2015 · Corresponding biogeochemical models for the ocean indicate that surface water pH will drop from a pre-industrial value of about 8.2 to about 7.8 ...Missing: decline | Show results with:decline
[23]
Ocean Acidification | Smithsonian Ocean
So far, ocean pH has dropped from 8.2 to 8.1 since the industrial revolution, and is expected by fall another 0.3 to 0.4 pH units by the end of the century.
[24]
Aragonite Saturation State - an overview | ScienceDirect Topics
Aragonite saturation states decline from already low values in temperate and polar waters, making these regions poorly suited for the growth of scleractinian, ...
[25]
Aragonite saturation state dynamics in a coastal upwelling zone
Apr 11, 2013 · [1] Coastal upwelling zones may be at enhanced risk from ocean acidification as upwelling brings low aragonite saturation state (ΩAr) waters ...Missing: thresholds | Show results with:thresholds
[26]
NOAA-led researchers discover ocean acidity is dissolving shells of ...
Apr 30, 2014 · “Our findings are the first evidence that a large fraction of the West Coast pteropod population is being affected by ocean acidification,” said ...
[27]
[PDF] Ocean Acidification in Pacific Northwest coastal waters
For example, the shells of free-swimming pteropods begin to dissolve when the aragonite saturation state is ~1.040. For Pacific oysters growing in the ...Missing: fisheries | Show results with:fisheries
[28]
[PDF] Global Warming and Ocean Acidification's Effect on Pteropod ...
In this paper we will analyze the effects of ocean acidification on pteropods and the resulting impact on the pink salmon stocks in Alaska. We will describe the ...
[29]
Massive Oyster Die-offs Show Ocean Acidification Has Arrived
Nov 21, 2011 · Colder, more acidic waters are welling up from the depths of the Pacific Ocean and streaming ashore in the fjords, bays, and estuaries of Oregon ...
[30]
Oyster farms face growing threat from ocean acidification in the ...
Jul 14, 2025 · Pacific Northwest hatcheries began experiencing mass die-offs of oyster larvae nearly two decades ago, later linked to ocean acidification ...Missing: 2010-2020 | Show results with:2010-2020
[31]
Ocean Acidification Triggers Cell Signaling, Suppress Immune and ...
The resultant reduction of pH can be detrimental during the early developmental stages of the commercially important edible Pacific oyster Crassostrea gigas; ...Missing: die- | Show results with:die-
[32]
Assessing impacts of coastal warming, acidification, and ... - BG
Nov 24, 2023 · Acidification may inhibit shell formation. Combined impacts of warming and acidification may affect oyster larvae, potentially shortening ...Missing: die- | Show results with:die-
[33]
Imperilled by ocean acidification: how US Pacific shellfish farms are ...
May 7, 2024 · It began with a mystery: oyster larvae were dying in their millions in the coastal hatcheries that supply surrounding shellfish farms. Farmers ...Missing: 2010-2020 | Show results with:2010-2020
[34]
Ocean Acidification's impact on oysters and other shellfish
When the waters were highly corrosive, the organisms died within two days. The oyster larvae just simply died. When the water was high pH, they did just fine.Missing: 2010-2020 | Show results with:2010-2020
[35]
Ocean deoxygenation - resource | IUCN
Globally, oceans have lost around 2% of dissolved oxygen since the 1950s and are expected to lose about 3–4% by the year 2100 under a business-as-usual ...
[36]
Declining oxygen in the global ocean and coastal waters | Science
Jan 5, 2018 · Oxygen concentrations in both the open ocean and coastal waters have been declining since at least the middle of the 20th century.
[37]
[PDF] Ocean changes – warming, stratification, circulation, acidification ...
Jun 28, 2017 · Abstract. 1. The world's oceans have absorbed about 93% of the excess heat caused by greenhouse gas warming since the mid-20th century, ...
[38]
Dead zones in our oceans have increased dramatically since 1950
Jan 18, 2018 · Dead zones in coastal areas across the globe have increased tenfold since 1950. Warming sea temperatures have also quadrupled the spread of dead zones in the ...
[39]
2024 'dead zone' in Gulf of Mexico is now larger than NOAA predicted
Aug 5, 2024 · The average size of the dead zone is 4,298 square miles, based on the past five years of data. The 2024 zone in the Gulf is about 6,705 square ...
[40]
Gulf of Mexico 'dead zone' larger than average, scientists find - NOAA
Aug 1, 2024 · The five-year average size of the dead zone is now 4,298 square miles, more than two times larger than the 2035 target. “It's critical that we ...
[41]
Reversal of Increasing Tropical Ocean Hypoxia Trends With ...
Mar 13, 2018 · Here we show that this increasing hypoxia trend reverses in the tropics after 2100 in the Community Earth System Model forced by atmospheric CO 2.
[42]
A committed fourfold increase in ocean oxygen loss - Nature
Apr 16, 2021 · According to the model results, the deep ocean will thereby lose more than 10% of its pre-industrial oxygen content even if CO2 emissions and ...
[43]
Climate change is overhauling marine nutrient cycles, scientists say
Feb 4, 2025 · "Model studies have suggested that when the ocean warms it gets more stratified, which can drain certain parts of the surface ocean of nutrients ...
[44]
Fluctuations in stratification and nutrient dynamics during the pre ...
Aug 23, 2025 · In recent decades, upper-ocean stratification intensity has increased due to surface warming, driven by anthropogenic climate change. Since the ...
[45]
Transient overturning changes cause an upper-ocean nutrient ...
Sep 4, 2024 · Increases in surface stratification due to global warming are projected to limit surface nutrient supply and decrease biological productivity ...
[46]
Trends and decadal oscillations of oxygen and nutrients at 50 to 300 ...
Feb 17, 2020 · In most ocean basins, a decrease in oxygen (“deoxygenation”) and an increase in nutrients have been observed in subsurface layers. Deoxygenation ...
[47]
Climate change and fishing: a century of shifting distribution in North ...
It is of note that North Sea cod distribution stayed fairly constant throughout the period 1920s–1980s in spite of variability in temperature and phase of the ...
[48]
Temperature change effects on marine fish range shifts
May 30, 2023 · Bony juvenile fish shifted poleward faster (15.2 km year−1) than adults (2.8 km year−1), while non-bony fish on average moved equatorward by 0.2 ...2 Methods · 3 Results · 4 Discussion
[49]
Predicted changes in the distribution of fish species and diversity
For example, on a global scale, the median poleward shifts for 802 fish and invertebrate species were predicted to be about 15.5 and 25.6 km per decade, ...Missing: empirical | Show results with:empirical
[50]
Climate change drives shifts in straddling fish stocks in the world's ...
Jul 30, 2025 · Our results suggest that regardless of the climate change scenario, at least 37% and 54% of stocks are projected to shift between EEZs and the ...
[51]
The state of world highly migratory, straddling and other high seas ...
This document describes highly migratory fish stocks, straddling fish stocks, and stocks of other high seas fishery resources and the fisheries for them, ...Missing: IPCC 2023-2025
[52]
[PDF] Climate change, tropical fisheries and prospects for sustainable ...
Maximum catch potential in some tropical exclusive economic zones is projected to decline by up to 40% by the 2050s under continued high greenhouse gas ...
[53]
The metabolic pace of life histories across fishes - PMC - NIH
Finally, while measurement temperature greatly affects metabolic rate, environmental temperature may have an evolutionary effect on both metabolic rate and life ...
[54]
Climate change in fish: effects of respiratory constraints on optimal ...
Feb 1, 2015 · Initially, warming expands aerobic scope, allowing for faster growth and increased reproduction. Beyond the optimal temperature for fitness, ...
[55]
Temperature impacts on fish physiology and resource abundance ...
We found that warming leads to increased size‐at‐age of fishes when temperature‐dependence is included in physiological rates. This effect is strongest in ...
[56]
(PDF) Temperature affects fish body sizes. Which sizes?
Jun 15, 2024 · One of the consequences of global warming is reduced final body sizes in animals of different orders, mainly in aquatic ectotherms like fish or ...
[57]
Climate change impacts on mismatches between phytoplankton ...
May 31, 2019 · We modeled the impacts of climate change on the timing of phytoplankton blooms and spawning of two classes of fishes: “geographic spawners” ...
[58]
Climate change impacts on mismatches between phytoplankton ...
May 31, 2019 · The temperature-linked phenology of geographic spawners changes at a rate twice as fast as phytoplankton, causing these fishes to spawn before ...
[59]
Fewer fish may reach breeding age as climate change skews timing ...
Jul 24, 2019 · Princeton University research suggests that climate change could throw off the timing of fish breeding with phytoplankton blooms.
[60]
The effects of water temperature on the juvenile performance of two ...
Sep 26, 2019 · Lower water temperature resulted in reduced growth rates, feeding rates, burst escape speed and metabolic rates of both species, with significantly reduced ...
[61]
Larger but younger fish when growth outpaces mortality in heated ...
May 9, 2023 · Our study provides strong evidence for warming-induced differentiation in growth and mortality in a natural population of an unexploited, ...<|separator|>
[62]
Temperature-dependent plasticity mediates heart morphology and ...
The purpose of this study was to assess the capacity for phenotypic plasticity in the acute thermal tolerance of juvenile Atlantic salmon, while investigating ...
[63]
Thermal plasticity in farmed, wild and hybrid Atlantic salmon during ...
Feb 16, 2016 · Phenotypic plasticity plays a significant role in thermal tolerance and thermal growth optimums, and strong positive effects of acclimatisation ...
[64]
Global ensemble projections reveal trophic amplification of ocean ...
Jun 11, 2019 · It reveals that global marine animal biomass will decline under all emission scenarios, driven by increasing temperature and decreasing primary production.
[65]
Changing Ocean, Marine Ecosystems, and Dependent Communities
The warming ocean is affecting marine organisms at multiple trophic levels, impacting fisheries with implications for food production and human communities.
[66]
Ocean Acidification-Induced Restructuring of the Plankton Food ...
Ocean acidification (OA) is expected to alter plankton community structure in the future ocean. This, in turn, could change the composition of sinking ...
[67]
Combined effects of ocean acidification and warming on ...
Acidification alters phytoplankton communities with increased proportions of dinoflagellates and reduced that of diatoms. •. Combination of warming and ...
[68]
Ocean acidification may cause dramatic changes to phytoplankton
Jul 20, 2015 · Study finds many species may die out and others may migrate significantly as ocean acidification intensifies.
[69]
Review of Jellyfish Blooms in the Mediterranean and Black Sea
Aug 6, 2025 · Jellyfish blooms are part of a natural life cycle but became a matter of concern in the early 1980s in the Mediterranean Sea (Boero 2014 ) and ...Missing: post- | Show results with:post-
[70]
Jellyfish are taking over the world – and climate change could be to ...
Jan 8, 2019 · The explosion in their numbers has been attributed to warming seas and even increased pollution; unlike many other marine creatures, jellyfish can cope with ...
[71]
https://www.nature.com/articles/s41467-025-64576-8
[72]
Review Climate change effects on biodiversity, ecosystems ...
Sep 1, 2020 · Rising ocean temperatures are driving widespread coral bleaching, contributing to coral cover loss, impacting fish communities, and increasing ...
[73]
Climate Change and Marine Food Webs - Wiley Online Library
Mar 27, 2025 · This study uses qualitative network models to explore how climate-driven shifts in marine food web interactions could impact salmon ...
[74]
Mediating role of food web structure in linking diversity to ...
Oct 10, 2025 · Here, we analyzed 217 global marine food webs, quantifying structural properties and multidimensional stability to evaluate how diversity and ...
[75]
An ecological network approach to predict ecosystem service ...
Mar 11, 2021 · We find that food web and ecosystem service robustness are highly correlated, but that robustness varies across ecosystem services depending on ...
[76]
Next-generation ensemble projections reveal higher climate risks for ...
Oct 21, 2021 · The new ensemble ecosystem simulations show a greater decline in mean global ocean animal biomass under both strong-mitigation and high-emissions scenarios due ...
[77]
Peru anchovy season fails to calm fishmeal industry unsettled by ...
Nov 8, 2023 · Peru anchovy season fails to calm fishmeal industry unsettled by climate change · Sharp decline in Peru fishery sales continues despite rise in ...
[78]
Industrial Marine Fishing in the Face of Climate Change in Peru - 2023
Nov 15, 2023 · The study concludes that the industrial Peruvian anchoveta catch is negatively affected by SST, fishing effort (search time in hours), and catch per unit of ...
[79]
Summary for Policymakers — Special Report on the Ocean and ...
Projected declines in glacier runoff by 2100 (RCP8.5) can reduce basin ... The rate and magnitude of decline are projected to be highest in the tropics ...
[80]
https://www.nature.com/articles/nclimate2647
[81]
Climate Change is Pushing Boreal Fish Northwards to the Arctic
Dec 16, 2015 · Boreal (warm-water affinity) species of fish have shifted extensively northward into the Arctic domain (Mueter and Litzow 2008, Grebmeier et al.Missing: temperate | Show results with:temperate
[82]
Overexploitation, Recovery, and Warming of the Barents Sea ...
Sep 16, 2021 · These biomass increases were likely driven by an increase in primary production resulting from warming and a decrease in ice-coverage. During ...
[83]
Climate warming drives large-scale changes in ecosystem function
For example, one of the changes occurring in the northern parts of the Barents Sea was an increase in fish body size. Large individuals require more energy ...
[84]
Future trends of marine fish biomass distributions from the North Sea ...
Jul 5, 2024 · The biggest increases were projected in the northern Barents Sea, with doubling of species richness around Svalbard and the north coast of ...
[85]
Study Shows Pollock Stocks Are Mixing More Due To Changing ...
Oct 26, 2020 · This suggests that pollock have the potential to move northward from the north Bering Sea into the Chukchi as the climate warms and sea-ice ...
[86]
Capture fisheries production - FAO Knowledge Repository
The relatively static trend in global capture fisheries continued in 2022, fluctuating between 86 million tonnes and 93 million tonnes per year from the late ...
[87]
Fish and Overfishing - Our World in Data
First, we see that global fish catch has been relatively stable since 1990. If aquaculture was putting pressure on fish production, it's not obvious from ...
[88]
Overfishing has greater impact on midwestern fish populations than ...
Oct 16, 2025 · A recent University of Wisconsin study found that overfishing is hurting the Wisconsin and Minnesota fish population more than climate ...
[89]
Under Pressure: Study Finds that Fishing, Not Warming, is Currently ...
Oct 2, 2025 · Under Pressure: Study Finds that Fishing, Not Warming, is Currently Having a Greater Impact on Our Recreational Fisheries ... By Adam Hinterthuer ...
[90]
UW-Madison research finds overfishing worse than climate change ...
Oct 13, 2025 · A UW-Madison study concluded that fishing has a greater effect on fish populations than rising temperatures resulting from global warming, ...
[91]
Ocean Fish Numbers Cut in Half Since 1970 | Scientific American
Sep 16, 2015 · The amount of fish in the oceans has halved since 1970, in a plunge to the "brink of collapse" caused by over-fishing and other threats.
[92]
How will fisheries change in a hotter world? Experts share - Mongabay
Aug 13, 2025 · Under climate change, tuna will increasingly move into the high seas, where fishing rights are managed under international agreements. ... © 2025 ...
[93]
Climate change is driving fish stocks from countries' waters to the ...
Aug 29, 2025 · As the ocean warms, some fish stocks are projected to move away from the exclusive access zones of countries such as Palau and into ...
[94]
FAO: 64.5% of global stocks are sustainably fished, but overfishing ...
Jun 16, 2025 · While 64.5 percent of fishery stocks are sustainably fished, 35.5 percent are overfished. When weighted by production, 77.2 percent of global ...
[95]
Stock collapse and its effect on species interactions: Cod and ...
Due to overexploitation, the NSS herring stock collapsed in the 1960s from a biomass of more than 14 million tonnes in 1956 to less than 0.1 million tonnes in ...Missing: 1970s | Show results with:1970s
[96]
Lessons learned from stock collapse and recovery of North Sea ...
The recruitment failure in the 1970s has had a profound effect on the herring fishery, not only in the North Sea, but also in adjacent waters. Adequate ...Introduction · Productivity · Multispecies interactions and... · The fishing industry
[97]
The nascent recovery of the Georges Bank haddock stock
World-wide many fish stocks have been depleted by overfishing. In this study, we describe the nascent recovery of the Georges Bank haddock stock.Missing: rebound | Show results with:rebound
[98]
After many years, New England cod seems to be rebounding ... - NPR
Jul 8, 2022 · Atlantic cod was central to building New England's economy. But today, the fishing industry pulls in historically low levels because of strict ...
[99]
Disentangling the historical impacts of warming and fishing on ...
Oct 1, 2025 · For the majority of populations (92%), fishing had a more pronounced effect on population dynamics than warming during the time period examined.Missing: overfishing | Show results with:overfishing
[100]
Extent of Physical Disturbance to Benthic Habitats: Fisheries with ...
A risk assessment showed seafloor disturbance caused by fishing occurred in all broad habitat types, 48% of the assessed area in 2016 to 2020, and 53% during ...
[101]
Evaluating the sustainability and environmental impacts of trawling ...
Jul 19, 2023 · The magnitude of the effect of the trawl disturbance on benthic communities depends on the frequency of trawling, the impact (or depletion rate) ...
[102]
Warming exacerbates oxygen depletion in the western Baltic Sea
Dec 20, 2024 · Eutrophication and rising water temperatures are taking an increasing toll on the Baltic Sea, leading to dangerous oxygen depletion in deeper ...Missing: pollution 2020s
[103]
Synergistic Effects of Climate Change and Marine Pollution - NIH
Jul 31, 2019 · One key result is that the synergistic effect of these stressors is greater on species diversity than on ecosystem traits.
[104]
Natural and fishing disturbances combine to drive seafloor ...
These results highlight that natural disturbances from currents and tides can be a powerful driver of benthic community dynamics in high energy shelf ecosystems ...<|separator|>
[105]
Fluctuations in coral reef fish densities after environmental ...
Apr 8, 2019 · Our findings showed an overall decline of 68% in fish density post-disturbance, with a significant density decrease in nine of 11 trophic groups ...Missing: variance | Show results with:variance
[106]
Environmental change between 1980 and 2020 followed by societal ...
May 15, 2025 · Formerly degraded coastal habitats are recovering (especially seagrass), while the commercial fish catch collapsed, likely caused by the large- ...
[107]
Energy transition: Charting a fair course for fishing fleets - UNCTAD
Jan 30, 2024 · Global fishing fleets, powered mainly by fossil fuels such as marine diesel, emit between 0.1% to 0.5% of global carbon emissions, or up to 159 ...Missing: Gt | Show results with:Gt
[108]
Global trends in carbon dioxide (CO 2 ) emissions from fuel ...
Global CO2 emissions from the main engine combustion of fuel in marine fisheries amounted to approximately 207 million t of CO2 in 2016, compared to 47 million ...Missing: percentage | Show results with:percentage
[109]
Factors affecting greenhouse gas emissions in fisheries
Jun 8, 2021 · However, emissions from fishing grew by 28% from 1990 to 2011 and fishing currently contributes about 4% of the emissions of world food ...Abstract · Introduction · Icelandic fisheries · Material and methods
[110]
How much carbon does ocean trawling put into the atmosphere?
Jan 18, 2024 · New research suggests that bottom trawling stirs up large amounts of carbon from the seabed and releases 55-60% of this carbon into the ...
[111]
Officially bogus: Bottom trawling does not release as much carbon ...
Jun 14, 2023 · Bottom trawling released as much carbon as all air travel, thus selling MPAs as a climate change solution via carbon sequestration.
[112]
Understanding blue carbon | NOAA Climate.gov
Sep 29, 2022 · Blue-carbon ecosystems have a small global footprint, but they can bury many times more carbon per acre than even a tropical rainforest.
[113]
From Mangroves to Seagrass, Blue Carbon Ecosystems Are Critical ...
Nov 21, 2023 · “People don't realize how powerful these carbon sinks are – they store five times more carbon than forests,” said Michele Diez, Senior ...
[114]
Identifying priority areas to manage mobile bottom fishing on seabed ...
Sep 13, 2022 · Mobile bottom fishing using trawls and dredges may cause significant reductions in seabed sediment organic carbon stores, limiting the oceanic carbon sink.<|control11|><|separator|>
[115]
The blue carbon wealth of nations | Nature Climate Change
Jul 12, 2021 · Carbon sequestration and storage in mangroves, salt marshes and seagrass meadows is an essential coastal 'blue carbon' ecosystem service for ...
[116]
About Small-scale Fisheries - SSF Hub
The 60 million with full- or part-time jobs in small-scale fisheries account for 90 percent of total fisheries employment worldwide. Approximately four of every ...
[117]
Chapter 15: Small Islands | Climate Change 2022: Impacts ...
Most Pacific Island Countries could experience ≥ 50% declines in maximum fish catch potential by 2100 relative to 1980–2000 under both an RCP2.6 and RCP8.5 ...
[118]
Vulnerability of Fishery-Based Livelihoods to Climate Change in ...
Mar 23, 2021 · This study examined the household-level vulnerability of fishery-based livelihoods in two coastal communities in Central Vietnam.
[119]
Climate change drives shifts in straddling fish stocks in the world's ...
Jul 30, 2025 · Here, perch-like species are projected to increase SSR by 1.3 to 1.5% under a low-emission scenario by 2050 and 3% under a high-emission ...
[120]
Growth Strategies and Diversification in the Pacific Islands Countries ...
Jun 13, 2025 · We examine growth strategies for the Pacific Island Countries (PICs) focusing on the role of tourism and diversification.
[121]
Climate change leaves future of Pacific Islands tourism 'highly ... - BBC
Sep 8, 2024 · Tourist sector bosses in the region are increasingly concerned about the impact of climate change.Missing: diversification 2020-2024<|separator|>
[122]
[PDF] OECD Review of Fisheries 2025 (EN)
Note: TAC = Total allowable catch limits, ITQ = Individual transferable quotas, number of stocks in parentheses. Source: OECD (2025). Fisheries Management ...
[123]
Governing fisheries for sustainability: how ITQs can contribute to the ...
Individual Transferable Quota (ITQ) systems have become a cornerstone of fisheries management in many developed countries. Table 1 summarizes how ITQ systems ...
[124]
Determinants of small-scale fisheries' transformative responses ...
Vulnerability of coastal communities to key impacts of climate change on coral reef fisheries. Global Environmental Change 22(1):12–20. https://doi.org ...Introduction · Methods · Results and Discussion<|separator|>
[125]
Stronger adaptive response among small-scale fishers experiencing ...
Oct 20, 2022 · Recent work suggests that adaptation responses in fisheries cover a range of strategies, from remaining and coping to adapting and transforming, ...
[126]
FAO Report: Global fisheries and aquaculture production reaches a ...
Jun 7, 2024 · Global fisheries and aquaculture production in 2022 surged to 223.2 million tonnes, a 4.4 percent increase from the year 2020.
[127]
The State of World Fisheries and Aquaculture
A detailed situation report on matters ranging from global aquatic resources to the trade in seafood products or the extent of illegal, unreported and ...
[128]
OECD-FAO Agricultural Outlook 2025-2034
Jul 15, 2025 · Global fisheries and aquaculture production is projected to increase from 189 Mt (live weight equivalent) in the base period to 212 Mt by 2034.
[129]
Global aquaculture surging, with production surpassing wild-catch ...
Jun 10, 2024 · Seafood accounted for 15 percent of animal proteins and 6 percent of total proteins consumed worldwide in 2022, including serving as 20 percent ...
[130]
Future fisheries can expect $10 billion revenue loss due to climate ...
Sep 7, 2016 · Global fisheries stand to lose approximately $10 billion of their annual revenue by 2050 if climate change continues unchecked, and countries ...
[131]
Projected change in global fisheries revenues under climate change
Sep 7, 2016 · We show that global fisheries revenues could drop by 35% more than the projected decrease in catches by the 2050 s under high CO 2 emission scenarios.
[132]
Climate change exacerbates nutrient disparities from seafood - PMC
Oct 30, 2023 · EEZs in the tropical Pacific region are 'hotspots' of decline, with projected loses of >30% (Fig.
[133]
https://www.statista.com/outlook/cmo/food/fish-seafood/northern-europe
[134]
[PDF] The 2023 Annual Economic Report on the EU Fishing Fleet (STECF
This is the 2023 Annual Economic Report on the EU Fishing Fleet, a Science for Policy report by the JRC, aiming to support European policymaking.
[135]
Disentangling the historical impacts of warming and fishing on ... - NIH
Oct 1, 2025 · We used a temperature-dependent population dynamics model to assess the impacts of lake warming and fishing on 521 freshwater fish populations ...
[136]
Modifying Fishing Gear Reduces Shark Bycatch in the Pacific
Aug 16, 2022 · They found that switching from wire to monofilament leaders reduced the catch rate of sharks by approximately 41 percent and still maintained ...
[137]
Bycatch Reduction Engineering Program - NOAA Fisheries
Sep 25, 2025 · In the Southeast, use of larger circle hooks is reducing bycatch of under-sized red grouper by more than 70 percent. Smaller circle hooks are ...<|separator|>
[138]
Bycatch Reduction Engineering Program 2020 Report to Congress
Sep 8, 2023 · This report describes the FY20 projects that leverage technology to reduce bycatch in the nation's fisheries.Missing: selective 30-50% implementations
[139]
Electronic Monitoring | NOAA Fisheries
Apr 10, 2025 · Electronic monitoring is a tool used to collect fishing data that support and improve stock assessments and ensure that catch limits are sustainable in the ...Missing: satellite dynamic quotas
[140]
A Multimodal Computer Vision System for Fisheries Monitoring
A comprehensive and specialized computer vision system for counting and classifying tuna and associated bycatch species onboard commercial fishing vessels.
[141]
NOAA Fisheries looking for AI solutions to improve fishery surveys
Oct 18, 2024 · NOAA Fisheries is looking for large-scale imagery and artificial intelligence products that can supplement or replace its fishery surveys.
[142]
Electronic Technologies | NOAA Fisheries
Dec 12, 2023 · Leveraging Artificial Intelligence for Electronic Monitoring ... AI applications can be used to predict where and when fishing may occur.Missing: dynamic pilots
[143]
Cohort 1: Alaska Longline Fishermen's Association - NREL
Mar 19, 2025 · Other vessels on a 3-day voyage could save 25%–61%, depending on the hybrid engine diesel/electricity ratio. Longer and more transit-intense ...Missing: percentages | Show results with:percentages
[144]
Energy Saving Potential of Hybrid Propulsion System for Fishing ...
The results show that the implementation of a hybrid system can reduce energy consumption by up to 29.4%, reduce fuel consumption by up to 25%, and reduce CO₂ ...
[145]
Improve Fishing Vessel Efficiency - Project Drawdown®
Sep 18, 2025 · Vessel modifications could provide fuel savings of up to 20% in small fishing vessels, which comprise roughly 86% of all motorized fishing ...Missing: percentages | Show results with:percentages
[146]
The evolution of New Zealand's fisheries science and management ...
Oct 17, 2013 · In 1986, New Zealand was one of the first countries to adopt individual transferable quotas (ITQs) as a primary means of managing its fisheries.
[147]
[PDF] Learning from New Zealand's 30 Years of Experience Managing ...
allocation of Individual Transferable Quota (ITQ) for all major commercial fisheries in New Zealand. Key features of the “Blue. Book” proposal were that ...
[148]
Improved fisheries management and aquaculture growth align with ...
Jul 26, 2024 · Our study found that wild-capture fisheries were more vulnerable to shocks compared with the younger, but rapidly expanding, aquaculture sector.
[149]
Global fishery prospects under contrasting management regimes
Mar 28, 2016 · Our results show that commonsense reforms to fishery management would dramatically improve overall fish abundance while increasing food security and profits.Missing: warming | Show results with:warming
[150]
Priorities for Tuna RFMOs in 2025 | FAD Management, Harvest ...
Feb 13, 2025 · ISSF identifies priority actions for tropical-tuna regional fisheries management organizations (RFMOs) to take to improve fishery sustainability in their ...
[151]
Report finds gaps in RFMOs' measures targeting eradication of tuna ...
Mar 26, 2021 · A report by the ISSF has found that five main tuna RFMOs haven't adopted provisions of the Port State Measures Agreement, hindering the ...Missing: 2010-2025 | Show results with:2010-2025
[152]
Key Gaps and Priorities in Tuna RFMO Port State Measures
This graphic, updated in March 2022, compares each tuna RFMO's port state measure elements against the provisions in the FAO Port State Measures Agreement (PSMA) ...Missing: 2010-2025 seas
[153]
FAO: Aquaculture officially overtakes fisheries in global seafood ...
Jun 10, 2024 · Global capture fisheries production remains stable, but the sustainability of fishery resources is a cause for concern. Urgent action is ...
[154]
Lessons from Asia on aquaculture growth potential amid resource ...
Jul 31, 2023 · Regionally, continental Asia has demonstrated remarkable growth and continues to dominate aquaculture, producing roughly 90 percent of products globally.
[155]
Tilapia as an aquaculture species - CABI Digital Library
Asia accounted for around 70% of the 6 million tonnes of world tilapia aquaculture production in 2018, mostly from South- eastern Asia. (35%) and Eastern Asia ( ...
[156]
Recirculating aquaculture systems: Advances, impacts, and ...
Oct 10, 2025 · Recent research highlights major advances in recirculating aquaculture systems (RAS), driving sustainable intensification in aquaculture.
[157]
Recirculating Aquaculture Systems Market Size to Surpass
May 12, 2025 · Market Growth: The recirculating aquaculture system market is expected to reach US$ 9,045.64 million by 2031 from US$ 5,194.07 million in 2023 ...<|separator|>
[158]
The economics of recirculating aquaculture systems
Jul 11, 2023 · RAS produce more kg of fish or shrimp per ha of land than pond or raceway production. Feed efficiencies also appear to be greater in RAS than in ...
[159]
https://www.researchandmarkets.com/report/cellular-agriculture
[160]
Cellular Aquaculture: Prospects and Challenges - PMC
Cellular aquaculture can provide an alternative, climate-resilient food production system to produce quality fish.
[161]
Cell-Based Seafood Unlocking Growth Potential: Analysis and ...
Rating 4.8 (1,980) Oct 15, 2025 · The global cell-based seafood market is poised for significant expansion, projected to reach an estimated market size of over $500 million ...
[162]
Persistent Uncertainties in Ocean Net Primary Production Climate ...
In our analysis extended to 16 CMIP6 models, global NPP is projected to decline by 1.76% under SSP5-85, with a likely uncertainty range of ±8.06% or a total ...
[163]
Characterizing Sources of Uncertainty from Global Climate Models ...
Dec 1, 2017 · The authors estimated that the ensemble uncertainty that was due to downscaling was comparable to the uncertainty attributable to GCMs and ...Missing: fisheries | Show results with:fisheries
[164]
Recommendations for quantifying and reducing uncertainty in ...
We found uncertainty associated with species distribution models can exceed uncertainty generated from diverging earth system models (up to 70% of total ...
[165]
Global decline in net primary production underestimated by climate ...
Feb 1, 2025 · The lack of consensus in the direction and magnitude of projected change in net primary production from models undermines efforts to assess climate impacts.Missing: overestimate | Show results with:overestimate
[166]
The status of fishery resources
The fraction of fishery stocks within biologically sustainable levels decreased to 64.6 percent in 2019, that is 1.2 percent lower than in 2017.Box 3improving The Fao... · Figure 25the Three Temporal... · BackgroundMissing: studies | Show results with:studies<|control11|><|separator|>
[167]
Global declines in net primary production in the ocean color era
Jul 1, 2025 · Here we show that statistically significant decreases in NPP have occurred in almost half of the ocean and these changes are dominated by declines in the ...
[168]
Global and Regional Marine Ecosystem Models Reveal Key ...
Mar 3, 2025 · Coupling these simulations with an ensemble of global marine ecosystem models has indicated broad decreases of fish biomass with warming.
[169]
A global overview of marine heatwaves in a changing climate - Nature
Nov 20, 2024 · Forecast systems based on global climate models have been used to estimate MHW probabilistic forecast skill and errors by comparing initialized ...
[170]
Assessment of the marine heatwaves prediction performance of the ...
The results revealed that FIO-CPS v2.0 can better predict MHWs in tropical regions, especially in the tropical central and eastern Pacific Ocean.Assessment Of The Marine... · 3. Results And Discussions · 3.2. Discussions On Mhws...
[171]
Uncertainties in projecting climate-change impacts in marine ...
We review how uncertainties in such projections are handled in marine science. We employ an approach developed in climate modelling by breaking uncertainty down ...
[172]
Observed and Projected Impacts of Climate Change on Marine ...
A recent estimate projected that total fisheries revenue in the Arctic region may increase by 39% (14–59%) by 2050 relative to 2000 under the Special Reports on ...
[173]
Potential impacts of ocean warming on energy flow and fisheries ...
Results showed that the total biomass of commercial species and fisheries catches would decline with rising temperature, especially under the RCP8.5 scenario.
[174]
Multidecadal Atlantic climate variability and its impact on marine ...
The heterogeneous influence of climate oscillations on sea surface temperature can affect the local behaviour of marine pelagic communities.
[175]
Multidecadal North Atlantic climate variability and its effect on North ...
Dec 3, 2005 · We speculate that SST variability associated with the AMO, affects salmon survival by altering the abundance, concentration, and location of ...
[176]
Marine Ecosystem Response to the Atlantic Multidecadal Oscillation
Feb 27, 2013 · The period of warming (warm AMO phase) from the 1930s to the 1960s had profound impacts for the fisheries of the North Atlantic from temperate ...<|separator|>
[177]
Reprint of “Atlantic Multidecadal Oscillation (AMO) modulates ...
Regime shifts in eastern North Atlantic ecosystems are associated with AMO dynamics. AMO affects Mediterranean fish populations.
[178]
Effective fisheries management instrumental in improving fish stock ...
Jan 13, 2020 · This article compiles estimates of the status of fish stocks from all available scientific assessments, comprising roughly half of the world's fish catch.Missing: peer | Show results with:peer
[179]
Mackerel stocks near breaking point because of overfishing, say ...
Apr 9, 2025 · Mackerel is under immense pressure from fishing activities across multiple nations, and the stock will soon be no longer able to sustain itself.<|separator|>
[180]
'The fish that stop': drivers of historical decline for Pacific cod and ...
Jul 10, 2025 · We assessed the evidence for three possible drivers of decline: social changes, overfishing and climate. Our analysis of the social drivers of ...Missing: debates | Show results with:debates
[181]
Cross regime UNCLOS and UNFCCC cooperation to address loss ...
UNCLOS and Fish Stocks Agreement do not provide actionable guidance about how to manage transboundary fisheries stocks migrating in response to climate change ...
[182]
Benefits of the Paris Agreement to ocean life, economies, and people
Feb 27, 2019 · Achieving the Paris Agreement has been projected to benefit fisheries through reducing changes in species composition and catch losses (5). Also ...
[183]
COP29: New FAO analysis maps Nationally Determined ...
Nov 18, 2024 · Food insecurity and biodiversity loss are the top reported climate-related risks, featuring in 88% of national climate action plans.<|separator|>
[184]
Adaptation Gap Report 2024 | UNEP - UN Environment Programme
Nov 7, 2024 · The report finds that progress in adaptation financing is not fast enough to close the enormous gap between needs and flows, which contributes ...<|separator|>
[185]
[PDF] State and Trends in Climate Adaptation Finance 2024
Adaptation funding to Africa only increased 14% compared to 2019–2020. • Despite the urgency for adaptation action in Africa, adaptation finance was only 36% of ...Missing: inefficiency audit
[186]
The Push to Reform Fisheries Subsidies
Oct 1, 2023 · $22 billion in subsidies of the $35 billion supporting fisheries globally are classified as harmful, immediately revealing the magnitude of ...
[187]
Reducing the Impact of Subsidies on Fishing Activity: Advances and ...
Dec 1, 2023 · For instance, we learned that globally about USD 35 billion are given as fisheries subsidies, and that of these subsidies, 60 percent are ...
[188]
Fisheries Subsidies and the WTO: How far have we come?
Mar 26, 2025 · The main rule broadly prohibits subsidies that contribute to overfishing and overcapacity.
[189]
International Fisheries Management - United States Department of ...
The Department of State has led negotiations with Canada to establish a number of formal agreements and treaties that facilitate cooperation on these shared ...Missing: adaptation | Show results with:adaptation
[190]
[PDF] Adaptive Systems for Climate-Ready Fisheries Management
May 14, 2024 · The former represents a more top-down process, and the latter repre- sents a bottom-up market-based approach to short-term shocks. The West ...
[191]
[PDF] World Trade Organization Talks on Subsidies That Contribute to ...
This update provides an overview of the draft text that constitutes the basis of current World. Trade Organization (WTO) negotiations on fisheries subsidies, ...