Fisheries Oceanography最新文献

{"title":"Linking Early Growth Rate and Recruitment Variability of Japanese Anchovy (Engraulis japonicus) in the Central Seto Inland Sea, Japan","authors":"Michio Yoneda,&nbsp;Tatsunori Fujita,&nbsp;Masayuki Yamamoto,&nbsp;Masahiro Nakamura,&nbsp;Masanori Takahashi,&nbsp;Naoaki Kono,&nbsp;Takeshi Tomiyama","doi":"10.1111/fog.70017","DOIUrl":"10.1111/fog.70017","url":null,"abstract":"<div>\u0000 \u0000 <p>Early growth rate in small pelagic fish is influenced by both exogenous and endogenous factors, and faster growth within a cohort is generally associated with higher survival and successful recruitment. In the central Seto Inland Sea, Hiuchi-Nada, western Japan, recruitment of Japanese anchovy (<i>Engraulis japonicus</i>) has markedly decreased over the past decade due to reduced early-life survival. This study assessed the link between early growth rate and recruitment indices by comparing growth rates of recruits between periods of high (2002–2006) and low (2013 and 2015–2019) recruitment. Growth rates were significantly lower during the low recruitment period, with fish exhibiting only about 80% of the growth rate observed during the high recruitment period at a given temperature. A time-series analysis revealed that prey biomass per spawning female, maternal condition factor, and nauplius density per larval density declined over the study period, while temperature increased. During the low recruitment period, recruits generally exhibited higher early growth rates than larvae (original population) of the same age, suggesting that faster growing individuals were more likely to survive. However, in 2017, the highest growth rate among recruits coincided with the lowest recruitment and survival indices, implying that the elevated growth may have resulted from growth-selective mortality favoring a small subset of rapid-growing individuals under intense top-down pressures. These findings suggest that the recent decline in early growth rates may be attributable to deteriorating maternal conditions and increased intracohort competition for prey under warming conditions, while year-specific growth-selective mortality may further shape recruitment outcomes.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"35 3","pages":"320-332"},"PeriodicalIF":2.7,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668046","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":"The Evidence for Nekton Distribution Modulated by Plankton Abundance in the High Seas Area of Northwest Pacific During Summer Season","authors":"Na Zang,&nbsp;Dongming Lin,&nbsp;Yizhen Shan,&nbsp;Bilin Liu,&nbsp;Xinjun Chen","doi":"10.1111/fog.70015","DOIUrl":"10.1111/fog.70015","url":null,"abstract":"<div>\u0000 \u0000 <p>Deterministic biotic interactions and abiotic conditions define species distributions and abundance, with plankton underpinning food webs to spatially structure predator distributions through bottom-up processes. However, characterizing the mechanism underlying species abundance formation in an oceanic system remains challenging. We applied piecewise structural equation models to examine plankton abundance and environmental conditions in nekton assembly, combined with joint species distribution models to investigate the distribution associations between nekton and plankton in the high-seas area of northwest Pacific. Results revealed that nekton distribution (fish and squid) showed significant associations with plankton abundance, where zooplankton correlations markedly surpassed phytoplankton associations. The fluctuations of plankton abundance directly influence nekton abundance, whereas the effects of environmental conditions were mediated indirectly through effects on plankton. These findings affirm the primacy of plankton abundance in driving nekton distribution and advance understanding of how bottom-up trophic pathways modulate nekton distribution dynamics in pelagic ecosystems.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"35 3","pages":"309-319"},"PeriodicalIF":2.7,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668228","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":"Compound-Specific Stable Isotope Analysis Reveals Population-Specific Differences in Chinook Salmon Trophic Level and Basal Resource Use in the Northeast Pacific","authors":"Jacob E. Lerner,&nbsp;Brian P. V. Hunt","doi":"10.1111/fog.70024","DOIUrl":"10.1111/fog.70024","url":null,"abstract":"<p>Chinook salmon exhibit far-flung and disparate population-specific marine migrations that have made it difficult to assess their trophic ecology. In this study, we collected returning and resident subadult Fraser River Chinook salmon in 2018 and 2019 from population groups with different known run-timings (spring, summer, and fall) and marine distributions relative to the Fraser River (local/south, north, offshore) and processed them for carbon and nitrogen CSIA-AA. We investigated population-specific differences in trophic level using <i>δ</i>¹⁵N_AA, and used <i>δ</i>¹³C_AA with published taxon-specific fingerprints of phytoplankton groups to investigate differences in the primary producer base that underpinned the food web they experienced. The south/local Fraser Fall 4₁ population exhibited distinct <i>δ</i>¹³C_AA values from the north and offshore Summer 4₁, Spring 5₂, and Summer 5₂ populations, likely due to their different geographic distributions and corresponding differences in primary producer communities. Chinook salmon trophic level was variable, with evidence for more omnivory and lower trophic levels in the southern distributing populations (TL = 3.7 ± 0.2) relative to the northern ones (TL = 3.9 ± 0.1), although there was interannual variability in the trophic level of the southern distributing population. This analysis builds on previous investigations of Chinook salmon marine ecology, linking distribution to basal food web resources to trophic level, and highlights the importance of population-specific marine distributions in structuring Chinook salmon trophic ecology. Knowledge of their food web ecology is necessary to understand how this species is and will respond to changing climate and ocean conditions and support management and conservation efforts.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"35 3","pages":"397-412"},"PeriodicalIF":2.7,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.70024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668290","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":"Analysis of Sea Turtle Bycatch by Andalusia Pelagic Longline Fleet in the Northeast Atlantic","authors":"Marina Tortosa,&nbsp;Jose Francisco Moreno,&nbsp;Ángel David Macías,&nbsp;Francisco Javier Abascal,&nbsp;Salvador García-Barcelona,&nbsp;Juan Jesús Bellido,&nbsp;José Carlos Báez","doi":"10.1111/fog.70025","DOIUrl":"10.1111/fog.70025","url":null,"abstract":"<p>The Northeast Atlantic is one of the most crucial foraging grounds for juvenile loggerhead (<i>Caretta caretta</i>) and leatherback turtles (<i>Dermochelys coriacea</i>), while also serving as an important fishing area for the Andalusia surface longline fishery. The main aim of present study is to assess the sea turtle interaction with the Andalusia pelagic longline fleet operating in the Northeast Atlantic. Between 2004 and 2023, a total of 235 sea turtles were observed incidentally caught during longline fishing operations in 975,379 hooks. These records correspond to data collected by the onboard observer program of the Spanish Institute of Oceanography (IEO), which covered 4.82% of total fishing activity in the area. Loggerhead turtles (<i>n</i> = 218) and leatherbacks (<i>n</i> = 17) were the only turtle species caught, with catch rates of 0.251 and 0.017 turtles per 1000 hooks, respectively. A generalized linear mixed model (GLMM) with negative binomial distribution revealed that season and moon phase significantly influenced catch per unit effort (CPUE), with spring (<i>p</i> = 0.024) being associated with fewer incidental captures and new moon (<i>p</i> = 0.035) with higher captures. Additionally, increased distance from the coast was positively correlated with higher CPUE (<i>p</i> = 0.006), while latitude exhibited a negative relationship with CPUE (<i>p</i> = 0.020). These findings contribute to our understanding of the variables involved in the incidental capture of sea turtles in surface longline fisheries targeting swordfish around the Canary Islands and may support the development of improved management strategies for their conservation.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"35 3","pages":"386-396"},"PeriodicalIF":2.7,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.70025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668347","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":"Natal Origin and Trans-Pacific Migration of Pacific Bluefin Tuna (Thunnus orientalis) Inferred From Otolith Oxygen and Carbon Isotope Analysis","authors":"Chia-Cheng Ku,&nbsp;Travis Richards,&nbsp;Owyn E. Snodgrass,&nbsp;Chien-Bang Jin,&nbsp;Pei-Ling Wang,&nbsp;Jen-Chieh Shiao","doi":"10.1111/fog.70032","DOIUrl":"10.1111/fog.70032","url":null,"abstract":"<div>\u0000 \u0000 <p>Pacific bluefin tuna (<i>Thunnus orientalis</i>, PBF) are highly migratory, with a single Pacific-wide stock facing complex management challenges due to extensive transoceanic movements and a recent population recovery. This study addresses persistent knowledge gaps regarding the quantitative contributions of different natal origins to key feeding grounds and the proportions of trans-Pacific migrants in spawning grounds. We used stable isotope analysis of otoliths (δ¹⁸O_oto and δ¹³C_oto) to investigate natal origins and migratory patterns of PBF collected from three key locations: the Philippine Sea–East China Sea (PS-ECS), the Sea of Japan (SoJ), and the California Current Large Marine Ecosystem (CCLME). Our analysis of δ¹⁸O_oto values effectively discriminated natal origins, revealing a strong dominance of PS-ECS-origin fish in catches across all areas. Specifically, 91% of PBF captured in the CCLME originated from the PS-ECS spawning grounds, a proportion that surpassed estimates from those captured in SoJ and PS-ECS. Additionally, the δ¹³C_oto analysis successfully distinguished between trans-Pacific migrants and resident individuals, confirming that a substantial proportion (87%) of adult PBF caught in the PS-ECS spawning grounds have previously migrated to the CCLME. These results confirm the high connectivity of PBF across the Pacific and support its management as a single stock. The high proportion of PS-ECS-origin fish utilizing the CCLME as a critical feeding ground underscores the necessity of managing juvenile exploitation in Eastern Pacific waters to ensure sufficient survivorship and maximize the reproductive output of the adult spawning stock in the Western Pacific. The quantitative estimates of natal origins and migratory patterns derived from this study provide crucial data for future stock assessments and the development of improved spatially explicit management models.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"35 3","pages":"462-476"},"PeriodicalIF":2.7,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668622","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":"Capelin Size, Condition, and Abundance Through Multiple Heatwaves in Alaska","authors":"Robert M. Suryan,&nbsp;Jacek Maselko,&nbsp;Emily A. Fergusson,&nbsp;Fletcher Sewall,&nbsp;Johanna J. Vollenweider,&nbsp;Alexander G. Andrews III,&nbsp;James M. Murphy,&nbsp;Ellen M. Yasumiishi","doi":"10.1111/fog.70022","DOIUrl":"10.1111/fog.70022","url":null,"abstract":"<p>Capelin (<i>Mallotus</i> spp.) are pelagic forage fishes that can be especially abundant in sub-arctic marine ecosystems and are important prey for upper trophic-level consumers. Abundance and distribution of capelin have been linked to ocean temperature, but the magnitude and directionality of thermal sensitivity can vary regionally. We used data spanning two decades (2002–2022) from autumn surface trawl surveys in three Alaska large marine ecosystems to evaluate how size, body condition, abundance, and distribution of age 1+ (60–130 mm) capelin responded to two marine heatwaves occurring within a 6-year period from 2014 to 2019. Body size did vary with ocean temperature and declines in body condition during heatwave years were observed in the Chukchi Sea and Gulf of Alaska where water temperatures were approaching the lower and upper bounds, respectively, of the species' known temperature range. There was no clear directional change in body condition during heatwave years in the Bering Sea where temperatures were intermediate among the three regions. Changes in capelin abundance, however, were dramatic and primarily driven by reduced encounter probability, which declined to zero in the upper water column of the Chukchi Sea and Gulf of Alaska during heatwave years. When capelin were encountered, however, catch-per-unit-effort was similar among regions and years. In the Bering Sea, encounter probability fluctuated but remained above zero during all years, with core areas of biomass distribution near St. Lawrence Island. Changes in abundance (primarily) and body condition reduced energy available to capelin predators by up to 600-fold during marine heatwave years.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"35 3","pages":"413-429"},"PeriodicalIF":2.7,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.70022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668294","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":"Latitudinal Differences in Age at First Maturity of the Largehead Hairtail (Trichiurus japonicus) Under Environmental Variability","authors":"Congxian Chen,&nbsp;Peng Sun,&nbsp;Guankui Liu,&nbsp;Fengming Lv,&nbsp;Yongjun Tian","doi":"10.1111/fog.70021","DOIUrl":"10.1111/fog.70021","url":null,"abstract":"<div>\u0000 \u0000 <p>The largehead hairtail (<i>Trichiurus japonicus</i>), a key commercial species in China Seas, has undergone life-history modifications including earlier maturation and decreased body size, attributed to prolonged overharvesting and environmental changes. However, spatial patterns of Age at first maturity (AFM) across its distribution range remain systematically uncharacterized. This study compared AFM between the Bohai Sea (temperate) and the East China Sea (subtropical) populations through otolith microstructure analysis and probabilistic maturation reaction norms (PMRNs). Daily age distributions showed no regional structural differences (independent <i>t</i>-test, <i>p</i> &gt; 0.05), enabling construction of a unified PMRN model. The model identified a baseline maturation threshold at 178 days and showed the presence of population-specific deviations, with 50% maturity occurred at 176 days in Bohai specimens versus 181 days in East China Sea. Gradient forest analysis revealed sea bottom temperature (SBT) as the primary environmental factor influencing AFM difference. Comparative quantification demonstrated that specimens from warmer habitats exhibited systematically earlier maturation than those in cooler regions, with SBT variations accounting for the observed 5-day interpopulation difference. The methodological integration of PMRNs with environmental covariates provides a replicable framework for predicting climate-mediated shifts in fishery species phenology. Results advocate for regionally adaptive management protocols that account for temperature-dependent maturation plasticity to stabilize recruitment in spatially heterogeneous marine environments.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"35 3","pages":"359-369"},"PeriodicalIF":2.7,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668783","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":"Joint Spatiotemporal Models for the Estimation of Prey Consumption and Predator–Prey Overlap: Dynamics of Pacific Cod Predation on Snow and Tanner Crab in the Eastern Bering Sea","authors":"Jonathan C. P. Reum,&nbsp;James T. Thorson,&nbsp;Erin J. Fedewa","doi":"10.1111/fog.70023","DOIUrl":"10.1111/fog.70023","url":null,"abstract":"<p>Pacific cod (<i>Gadus macrocephalus</i>) are important predators of juvenile snow (<i>Chionoecetes opilio</i>) and Tanner crab (<i>Chionoecetes bairdi</i>) in the eastern Bering Sea (EBS), yet the relationship between cod–crab spatial overlap and total crab consumption is only partially understood. We developed a joint spatiotemporal model that simultaneously estimates crab densities, cod densities, mass-specific cod consumption rates of crab, and their residual covariation. From the model, we obtain spatial “predator-expanded” consumption rates (local mass-specific rates scaled by cod biomass) and annual, area-integrated time-series indices of crab consumption, cod–crab overlap, and cod and crab abundance. At local scales, spatial variation in predator-expanded consumption rates was largely driven by mass-specific consumption rates of crab rather than cod biomass densities. However, area-integrated crab consumption indices were strongly related to area-integrated indices of cod biomass, explaining &gt; 65% of interannual variance across indices built for different cod size classes and crab species. Cod–crab overlap accounted for intermediate levels of variance (15%–17%) for consumption indices of small cod (30–60 cm) preying on large juvenile crab (2.1–4 cm carapace width) but was unrelated to indices for large cod. Other predictors, including juvenile crab abundance and the spatial extent of cold bottom waters, explained &lt; 15% of variance, with effects varying by crab species and cod size class. The modeling framework should streamline production of overlap and consumption indices for use in population models and can facilitate understanding of natural mortality in this and other systems.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"35 3","pages":"370-385"},"PeriodicalIF":2.7,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.70023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668378","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":"Niche Differentiation Among Large Pelagic Fishes in the Southwest Atlantic Revealed by Stable Isotope Analysis","authors":"Bruna N. Machado,&nbsp;Gleici Natali Montanini dos Santos,&nbsp;Alexandre Freitas de Azevedo,&nbsp;José Lailson-Brito,&nbsp;Tatiana Lemos Bisi","doi":"10.1111/fog.70020","DOIUrl":"10.1111/fog.70020","url":null,"abstract":"<div>\u0000 \u0000 <p>Understanding the trophic ecology of large pelagic fishes is essential to assess their ecological role in marine ecosystems and to develop effective conservation strategies. In the present study, we aimed to provide new information on the trophic ecology of eight large pelagic fish species (<i>Thunnus atlanticus</i> (blackfin tuna), <i>Thunnus albacares</i> (yellowfin tuna), <i>Katsuwonus pelamis</i> (skipjack tuna), <i>Sarda sarda</i> (Atlantic bonito), <i>Euthynnus alletteratus</i> (little tunny<i>)</i>, <i>Coryphaena hippurus</i> (dolphinfish), <i>Istiophorus albicans</i> (Atlantic sailfish), and <i>Kajikia albida</i> (white marlin)) using carbon and nitrogen stable isotope analysis. The isotopic data were used to determine the foraging range and trophic position of the species and to assess the isotopic niche widths and resource partitioning between them. Pelagic fish samples (<i>N</i> = 163) were acquired from the Cabo Frio commercial fleet, Rio de Janeiro, Brazil, between February 2009 and January 2010. We found significant differences in both δ¹³C and δ¹⁵N values among the species. <i>S. sarda</i> appears to feed at higher trophic levels and shows isotopic niche segregation with the species analyzed. However, there was a high degree of niche overlap between the other species, with the exception of the genus <i>Thunnus</i>. The isotopic niche width varied among species, with <i>C. hippurus</i> and <i>E. alletteratus</i> showing the widest niches, while <i>S. sarda</i> had the narrowest. These results highlight relevant aspects of the trophic dynamics of species of high commercial value in a region that has not been previously studied. The information contained here can serve as a basis for future conservation and management strategies for these species in the southwest Atlantic.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"35 3","pages":"347-358"},"PeriodicalIF":2.7,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668714","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":"Catch Efficiency and Biomass Estimates of Walleye Pollock (Gadus chalcogrammus) in Relation to Lagrangian Indicators and Surface Temperature of Water in the Okhotsk Sea","authors":"Vladimir V. Kulik,&nbsp;Evgeniy E. Ovsyannikov,&nbsp;Alexander I. Varkentin,&nbsp;Oleg I. Ilyin,&nbsp;Maxim V. Budyansky,&nbsp;Michael Yu. Uleysky,&nbsp;Sergey V. Prants","doi":"10.1111/fog.70026","DOIUrl":"10.1111/fog.70026","url":null,"abstract":"<div>\u0000 \u0000 <p>A generalized additive model (GAM), incorporating sea surface temperature (SST) as a predictor of catch per unit effort (CPUE; tons per hour) from commercial fishing, has been used for the assessment of the major stock of walleye pollock in the Okhotsk Sea. We evaluated 47 GAM configurations and 5 generalized linear model (GLM) configurations for commercial CPUE standardization, including SST and Lagrangian indicators (LIs) as explanatory variables. Incorporating LIs as a regression spline in the GAM improved model performance. Moreover, the vector autoregressive spatiotemporal model (VAST) and generalized additive mixed model (GAMM) including SST and/or LIs were tested to standardize total stock biomass (TSB), based on area-swept data (t/km²) from scientific surveys. The stock assessment model using standardized TSB outperformed models without the standardized TSB with respect to retrospective analysis and model convergence. These findings highlight the importance of SST and LIs in standardized indices for biomass estimation using cohort models, thereby improving the stock assessments of walleye pollock in the Okhotsk Sea.</p>\u0000 </div>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"35 3","pages":"430-444"},"PeriodicalIF":2.7,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668799","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}