Fisheries Oceanography最新文献

{"title":"Recurrence of the Spatial Structure of Summer Larval Fish Assemblages Linked to Hydrodynamics in the NW Mediterranean","authors":"Vanesa Raya,&nbsp;Jordi Salat,&nbsp;Ana Sabatés","doi":"10.1111/fog.12738","DOIUrl":"https://doi.org/10.1111/fog.12738","url":null,"abstract":"<p>In this study, we aim to investigate the contribution of various sources of variability, environmental, spatial and interannual on the larval fish assemblages (LFA) in summer off the Catalan coast, an area with a wide array of environmental conditions. The hydrodynamics of the area is controlled by the Northern Current, flowing southwestwards along the continental slope. This current displays high mesoscale variability presenting a meandering path and a series of anticyclonic eddies over the shelf. The study was based on three ichthyoplankton surveys carried out in July 2003, 2004 and 2012. The number of identified taxa, belonging to shelf and oceanic fish species, was quite similar among cruises, around 80, with the small pelagics <i>Engraulis encrasicolus</i> and <i>Sardinella aurita</i> being the dominant species. A high spatial heterogeneity in LFA was detected throughout the studied area. Most of this heterogeneity was related to the spatial variability of environmental factors, such as the continental shelf structure, latitudinal difference in surface temperature, chlorophyll-<i>a</i> concentration and stratification level. Hydrodynamic structures, mainly instabilities of the Northern Current and anticyclonic eddies, and the thermal front across the shelf, also played an important role in the configuration of the LFA. Although these showed certain interannual variability, mainly related to the 2003 heat wave and the low surface productivity of 2012, the recurrence of hydrodynamic structures, together with the spawning habits of adults, means that the spatial structure of LFA is maintained in different years.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"34 5","pages":"99-120"},"PeriodicalIF":2.7,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.12738","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144774059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feeding Ecology of Rough Scad Trachurus lathami in the South West Atlantic Ocean: Seasonal Diet Variability in Response to the Río de la Plata Plume Salinity Shifts","authors":"Brenda Temperoni,&nbsp;Santiago Aldo Barbini,&nbsp;Manuela Parietti,&nbsp;Paula Orlando,&nbsp;Claudio César Buratti","doi":"10.1111/fog.12739","DOIUrl":"https://doi.org/10.1111/fog.12739","url":null,"abstract":"<div>\u0000 \u0000 <p>This research examines <i>Trachurus lathami</i> diet composition and ontogenetic shifts (stomach content analysis and multiple hypothesis modeling) in the Northern Argentinean Continental Shelf (NACS, 34°–41° S, Southwest Atlantic Ocean), related to season (warm: October–March; cold: April–September) and water salinity (low &lt; 33.5, ls; high ≥ 33.5, hs), influenced by the Río de la Plata plume. A diet shift with fish size and a preference for larger prey during the cold season, linked to offshore distribution in hs waters, are hypothesized. Copepods dominated the diet, with larger species (&gt; 1.5 mm, e.g., <i>Calanoides carinatus</i>) prevalent in hs waters and smaller species (&lt; 1.5 mm, e.g., <i>Oncaea</i> spp.) in ls waters. Amphipods (<i>Themisto gaudichaudii</i>), decapod, and barnacle larvae were significant in the warm season, and the former was absent in the cold period. Ontogenetic shifts were minimal, being copepods the primary prey across sizes. Results indicate <i>T. lathami</i> is a generalist feeder, with diet changes driven by seasonal copepod availability linked to the Río de la Plata plume dynamics. These findings underscore the importance of long-term monitoring amid NACS warming and prey shifts to support fisheries' sustainability, given <i>T. lathami</i> rising biomass since the mid-90s and interactions with commercial pelagic species.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"34 5","pages":"83-98"},"PeriodicalIF":2.7,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144774113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Climate Change Opens Up New Fishing Possibilities for Large-Scale Trawling Vessels Off West Greenland","authors":"Matthew Hatton,&nbsp;Jack Laverick,&nbsp;Neil Banas,&nbsp;Elliot Sivel,&nbsp;Michael Heath","doi":"10.1111/fog.12736","DOIUrl":"https://doi.org/10.1111/fog.12736","url":null,"abstract":"<p>Climate change is transforming marine ecosystems, opening new fishing possibilities for large-scale trawling vessels in the Arctic. This study investigates the potential for new fishing grounds to emerge in West Greenland. We employed a maximum entropy model to predict fishing suitability based on climatological and time-invariant variables alongside public fishing vessel data. The model, validated with high accuracy, identified maximum depth, ice thickness and ice concentration as the most important predictors of fishing suitability. Results indicate a 6.2% increase in whole domain suitable fishing grounds from the 2010s to the 2040s, and a 11.4% increase from the 2010s to the 2090s. This change is driven by decreasing ice coverage, allowing extended access to the productive shelf edge. Increased fishing suitability could enhance fishing opportunities leading to increased economic benefits. However, the prolonged fishing season also raises concerns about overexploitation, ecological sustainability and sediment dispersion. Earlier access would enable trawling over carbon-rich sediments for extended periods, leading to a resuspension of sediment-bound carbon. Our findings highlight the need for adaptive management strategies to balance economic gains with the protection of marine ecosystems in the face of ongoing climate changes.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"34 5","pages":"59-69"},"PeriodicalIF":2.7,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.12736","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144774045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Environmental Drivers of the Summer Distribution of Lumpfish (Cyclopterus lumpus) in the Eastern Atlantic Ocean","authors":"James Kennedy,&nbsp;Søren Post,&nbsp;Caroline M. F. Durif,&nbsp;Jan Arge Jacobsen,&nbsp;Kai Wieland,&nbsp;Leif Nøttestad","doi":"10.1111/fog.12737","DOIUrl":"https://doi.org/10.1111/fog.12737","url":null,"abstract":"<div>\u0000 \u0000 <p>Lumpfish (<i>Cyclopterus lumpus</i>) spawn in coastal waters in the North Atlantic Ocean, yet little is known about the distribution outside of the spawning season. Using data from an extensive pelagic trawl survey that takes place annually in the Nordic Seas, we examine the distribution and abundance of different life stages of lumpfish during summer. Utilising generalised additive models, random forest and support vector machine, we investigate environmental variables that potentially could influence their distribution. Our results reveal that lumpfish have an extensive distribution covering the Irminger Sea, Denmark Strait and Norwegian Sea. However, their frequency of capture is lower south of Iceland and in the North Sea in comparison with other coastal and oceanic areas. Temperature emerged as a primary constraint on the distribution. Lumpfish were caught at over 90% of the stations when temperature at 20-m depth ranged between 4°C and 9°C but less frequently when temperature was outside of this range. Other environmental variables, such as salinity, mixed layer depth and measures of primary and secondary production, had low influence on the distribution of lumpfish.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"34 5","pages":"70-82"},"PeriodicalIF":2.7,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144774103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spring Food Spectrum of Two Planktivores (Sardina pilchardus Walbaum 1792 and Sardinella aurita Valenciennes 1847) From the Central Algerian Coast (3° E to 4° E—South West Mediterranean Sea) in Relation to Sexes and Sizes","authors":"Aziz Hafferssas,&nbsp;Zakia Mokrane,&nbsp;Lilia Mellak,&nbsp;Aldjia Kherchouche-Ait Kherchouche- Ait Ouadour","doi":"10.1111/fog.12735","DOIUrl":"https://doi.org/10.1111/fog.12735","url":null,"abstract":"<div>\u0000 \u0000 <p><i>Sardina pilchardus</i>, Walbaum 1792, and <i>Sardinella aurita</i>, Valenciennes 1847, are the fish most consumed by the Algerian population. Sardine has become increasingly rare in commercial fishing catches, whereas round sardinella is being sold at excessively high prices. Given the importance of trophic interactions between clupeids and the low levels of the pelagic food web (plankton and others), the stomach contents of the two species of <i>S. pilchardus</i> and <i>S. aurita</i> are studied. Samples are collected from the spring commercial fishery (April and May 2023) associated with the two main ports on the central coast (Algiers and Bou Ismail) justified by the intense trophic activity of these two predators. High feeding intensity (or stomach vacuity coefficient) is recorded in both males and females. Our results support the hypothesis that the diet of species in specific zones remains consistent due to stable local trophic resources. This is underscored by the lack of variation in prey quality and quantity across size and sex in both clupeid species, emphasizing the role of these interactions within the pelagic food web. Using the morphological identification and counting technique, the preys are linked to 12 taxonomic units belonging to the zooplankton, phytoplankton, and miscellaneous communities. The analysis of the diet is carried out by classifying the prey on the basis of the frequency index (<i>If</i>), taking into account the sex and the size where three categories of prey are defined. Copepods are the preferred prey with rates that did not differ significantly by sex and place of origin of the two clupeids. These findings extended to secondary prey (other zooplankton and phytoplankton). Also, the composition of the diet remained homogeneous in the Gulfs of Algiers and Bou Ismail. Quantitative and qualitative results on diet composition of the two clupeids and their trophic interactions within the two target ecosystems will serve as a basis for fisheries management (i.e., Ecosystem Approach to Fisheries Management [EAFM] and Ecosystem-Based Fisheries Management [EBFM]). The modeling of all the variables will allow decision makers to predict the level of exploitable biomass in the medium and long term.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"34 5","pages":"46-58"},"PeriodicalIF":2.7,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144773506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconsideration of Parapatric Distribution Between Pacific Saury (Cololabis saira) and Japanese Sardine (Sardinops melanostictus) in the Western North Pacific Ocean: Comparisons of Two Long-Term Field Survey Results","authors":"Akihiko Yatsu,&nbsp;Ryuuji Yukami,&nbsp;Yasunori Sakurai,&nbsp;Kazuyoshi Watanabe","doi":"10.1111/fog.12733","DOIUrl":"https://doi.org/10.1111/fog.12733","url":null,"abstract":"<div>\u0000 \u0000 <p>Pacific saury (<i>Cololabis saira</i>) and the Pacific stock of Japanese sardine (<i>Sardinops melanostictus</i>) are dominant small pelagic fishes and are targeted by international fisheries in the western North Pacific (WNP). Using monitoring results of a pelagic trawl survey during 2003–2019 in WNP and central North Pacific, a previous study detected a shift in the center of distribution along sea surface temperature gradient (<i>GT</i>) of saury only in WNP, together with “parapatric” horizontal distribution between the two species during the 2010s, when saury biomass declined and sardine biomass increased. Thus, it suggested biological interactions between the two species. To corroborate this “parapatric” distribution, we applied basically the identical statistical analyses to driftnet survey results along longitudinal transects at 155°E, 170°E, and 175.5°E during 1979–1999, when saury stock was abundant and sardine stock declined since 1989. Our results indicated <i>GT</i> of saury slightly shifted after 1989 at 155°E, and spatial distribution of the two species largely overlapped before 1989, which do not support the previous study. While saury biomass drastically declined in the western areas of their overall distribution since 2003 and age-0 sardine dominated in the pelagic trawl survey, age-0 sardine occupied the southern area of overall distribution in the driftnet survey. These observations suggest that interspecies interactions between saury and sardine, if existed, are unlikely to take a form of parapatry. The apparent parapatric distribution can be explained by different age compositions of sardine between the two surveys and biomass-derived eastward shrinkage of saury distribution since 2003.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"34 5","pages":"33-45"},"PeriodicalIF":2.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144774155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interaction Between Anchovy and Squat Lobster in Northern Patagonia: Effects on Trophic Relationships and Ecological Implications","authors":"Elvio Agustín Luzenti,&nbsp;Raúl Gonzalez,&nbsp;Silvana Laura Dans","doi":"10.1111/fog.12734","DOIUrl":"https://doi.org/10.1111/fog.12734","url":null,"abstract":"<div>\u0000 \u0000 <p>In the last decades, the population of the squat lobster <i>Munida gregaria</i> inhabiting the water column in the Patagonian Sea, Argentina, has expanded. This crustacean shares its habitat with the Argentine anchovy <i>Engraulis anchoita</i>, a key species in the marine food web. Existing information suggests that <i>M. gregaria</i> may compete with anchovy causing spatial segregation or interfere with the formation of fish schools. This study examines anchovy schools and squat lobster swarms sharing the water column in San Matías and Nuevo gulfs, in northern Patagonia. A total of four acoustic zigzag surveys were performed in San Matías gulf and five in Nuevo gulf, covering all the seasons. The echoes of both species were characterized and discriminated, measuring a set of shape, location, and density properties. A linear model was built to determine which factors affect anchovy school morphology. Anchovy schools presented well-defined edges, were amoeboid in shape, and occupied a wide range of depths in the water column. <i>M. gregaria</i> formed large and irregular aggregations, mainly in the upper half water column. Anchovy schools that interacted with <i>M. gregaria</i> tended to be larger and less dense, especially in spring and summer. This may result from either physical interference between individuals, leading to greater laxity in anchovy schools, or the partial dispersal of anchovies feeding on juvenile <i>M. gregaria</i>.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"34 5","pages":"17-32"},"PeriodicalIF":2.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144773455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Early Growth Pattern of Japanese Anchovy Engraulis japonicus in the Coastal Yellow Sea and Its Influencing Factors","authors":"Wenchao Zhang,&nbsp;Zhenjiang Ye,&nbsp;Yiqian Jiang,&nbsp;Chi Zhang,&nbsp;Jianchao Li,&nbsp;Yongjun Tian","doi":"10.1111/fog.12732","DOIUrl":"https://doi.org/10.1111/fog.12732","url":null,"abstract":"<div>\u0000 \u0000 <p>The growth rate during the early life stages is a key factor influencing fish recruitment variability. Extrinsic environmental factors such as temperature are generally having significant effects on early growth of larvae, while the intrinsic effects (e.g., ontogenetic or individual-specific differences) are often underestimated. In this study, the early growth pattern of Japanese anchovy (<i>Engraulis japonicus</i>) in the coastal Yellow Sea was estimated using otolith daily growth increments and the effects of both extrinsic and intrinsic factors on the early growth of anchovy were investigated using increasingly complex mixed-effects models. Mean growth rate during first otolith increment deposition to capture, estimated from otolith daily increment trajectories, was 0.43 ± 0.11 mm day⁻¹, and the proportion of anchovy larvae that hatched during neap tidal periods was relatively high. Early growth rate of anchovy was positively correlated with intrinsic factors (age, width of the first daily increment) and extrinsic factors (seawater temperature at hatching and during growth). The results of mixed-effects model also detected the faster growth occurred during the spring tide and that later hatching larvae were characterised by a higher growth rate. In addition, anchovy larvae exhibited a marked aggregation in the nearshore area and showed negative distribution characteristics in the upwelling areas. These results provide new evidence on the early growth pattern with intrinsic factors and spring tide; it is crucial for understanding the early growth and recruitment variability of anchovy in the context of climate change and may contribute to sustainable management policies for this valuable resource.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"34 5","pages":"1-16"},"PeriodicalIF":2.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144773454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial and Temporal Heterogeneity of Fish Spawning Dynamics on the West Florida Shelf During Fall","authors":"Keith Keel,&nbsp;Makenzie Kerr,&nbsp;Laura Y. Liu,&nbsp;Yonggang Liu,&nbsp;Joshua P. Kilborn,&nbsp;Glenn Zapfe,&nbsp;Ernst B. Peebles,&nbsp;Christopher D. Stallings,&nbsp;Mya Breitbart","doi":"10.1111/fog.12731","DOIUrl":"https://doi.org/10.1111/fog.12731","url":null,"abstract":"<p>Identifying spawning areas for economically and ecologically important fishes is critical for fisheries conservation and ecosystem-based management. We used genetic barcoding to identify fish eggs collected across the West Florida Shelf (WFS) during September of 2013, 2014, and 2019. Fish eggs were collected on Southeast Area Monitoring and Assessment Program (SEAMAP) ichthyoplankton cruises using a Continuous Underway Fish Egg Sampler. Analysis of 4833 fish eggs from the 3 years resulted in the identification of 82 species within 35 families. A 78% DNA barcoding success rate was achieved, with 46% of all identifications being at the species level. PERMANOVA results revealed significant differences in fish egg beta-diversity across time (the 3 years sampled) and space (preassigned levels of both depth class and regional strata). Our findings generally aligned with known adult fish distributions and spawning patterns, and we found that water-column depth played a more important role than regional strata in structuring the fish egg assemblages. Eggs from several economically important species were collected and observed at relatively high frequencies, including red snapper, lane snapper, vermilion snapper, yellowedge grouper, and king mackerel. We used the West Florida Coastal Ocean Model to hindcast the trajectories of all fish eggs and trace them back to possible spawning locations. We conducted backward tracking over a span of 36 h based on the assumption that most fish eggs on the WFS undergo hatching within this time window. The model estimated egg transport distances ranging from 1 to 79 km (mean distance of ~21 km), with greater transport distances estimated on the outer shelf in comparison to the middle and inner shelf. These results further our understanding of the spatial and interannual variation of fish spawning dynamics on the WFS and mark the beginning of a long-term monitoring effort.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"34 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.12731","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Marine Heatwaves and Climate-Driven Warming Impact Availability of Sardine Subpopulations to Northeast Pacific Fishing Ports","authors":"Barbara A. Muhling,&nbsp;Juan P. Zwolinski,&nbsp;Peter T. Kuriyama,&nbsp;Toby D. Auth,&nbsp;Richard D. Brodeur,&nbsp;Sylvia P. A. Jiménez Rosenberg,&nbsp;Gerardo Aceves-Medina,&nbsp;Jose Augusto Valencia Gasti,&nbsp;Michael G. Jacox,&nbsp;Mercedes Pozo Buil,&nbsp;Jerome Fiechter,&nbsp;Felipe J. Quezada Escalona,&nbsp;Desiree Tommasi","doi":"10.1111/fog.12730","DOIUrl":"https://doi.org/10.1111/fog.12730","url":null,"abstract":"<p>Changing ocean conditions are leading to spatial redistribution of many marine species, including those that support fisheries. A combination of gradual climate trends and shorter-lived extreme events, such as marine heatwaves, can change the availability of species or stocks to fishing ports, impacting fishing communities and challenging fisheries management frameworks. Pacific sardine (<i>Sardinops sagax</i>) in the California Current System are currently considered as two subpopulations for management purposes. They are separated from each other using oceanographic conditions, based on the assumption that each subpopulation is associated with different habitats and geographic areas. However, as climate change and marine heatwaves lead to increasingly novel environmental conditions in the region, habitat-based assignments may become impractical or unrealistic. In this study, we use generalized additive models to define sea surface temperature and surface chlorophyll conditions associated with the occurrence of multiple sardine life stages in fishery-independent surveys conducted in the California Current System. We then show how the spatial distribution of habitats across life stages and putative subpopulations may be influenced by both gradual climate change and marine heatwaves. Our results highlight the potential impacts of changing ocean conditions near major sardine landing ports. During recent marine heatwaves, habitat associated with the northern subpopulation became less available to southern California Current ports, and this trend is projected to continue through the end of the 21st century. Future spatial shifts in sardine habitat may increasingly challenge the practicality of habitat-based subpopulation separation and introduce more uncertainty into management frameworks.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"34 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.12730","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}