Fisheries Oceanography最新文献

{"title":"Extended and spatially asynchronous reproductive periodicity in a harvested, warm-temperate rocky-reef gastropod (Turbinidae)","authors":"Kate Seinor,&nbsp;Steven W. Purcell,&nbsp;Hamish Malcolm,&nbsp;Stephen D. A. Smith,&nbsp;Kirsten Benkendorff","doi":"10.1111/fog.12653","DOIUrl":"10.1111/fog.12653","url":null,"abstract":"<p>Turban snails are targeted for their high-quality meat and, consequently, are often subjected to heavy harvesting pressure. Managing recreational and small-scale fisheries is challenging, partly due to a lack of biological data underpinning certain regulatory measures. This study aimed to fill current knowledge gaps on the reproductive cycle of the recreationally and culturally harvested Australian turbinid, <i>Turbo militaris</i>. The objectives were to investigate the reproductive timing of <i>T. militaris</i> in New South Wales (NSW) and identify likely environmental drivers of reproductive periodicity. Oocytes and gonads were sampled from wild animals monthly over 15 months at two sites separated by ~500 km. Analysis of oocyte size frequency and gonadosomatic index revealed that <i>T. militaris</i> has a pattern of extended reproduction, which is synchronous between sexes. <i>Turbo militaris</i> was ripest during summer, and spawning appears to have occurred over multiple events, although primarily during winter. Reproductive timing was associated with environmental explanatory variables, including sea surface temperature, wave height, salinity, phytoplankton and nitrate concentration, together accounting for 81% of the variation in oocyte size frequency and 67% in the gonadosomatic index. Reproductive periodicity was correlated with wave conditions and phytoplankton concentrations inconsistently between sites, indicating that the effect of some environmental conditions may be unpredictable or site-specific. Reproductive timing was asynchronous between two sites in the NSW fishery, posing challenges for designing seasonal fishing closures and community-based harvesting rules. Spatial closures for species with spawning over extended timeframes, or spatially asynchronous reproductive cycles, are potentially more suitable for achieving fisheries management objectives.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"33 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.12653","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135258943","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":"Prediction of potential fishing grounds of swordtip squid (Uroteuthis edulis) based on a physical–biochemical coupled model","authors":"Takeshi Ito,&nbsp;Katsumi Takayama,&nbsp;Naoki Hirose","doi":"10.1111/fog.12652","DOIUrl":"10.1111/fog.12652","url":null,"abstract":"<p>Swordtip squid (<i>Uroteuthis edulis</i>), which is sometimes eaten alive (lively squid) in northwest Kyushu, Japan, is an economically important fish species in the region. However, the total catch of this species in Japan has declined by more than 80% in the last three decades. To understand and predict the spatio-temporal distribution of fish species, we developed a one-dimensional ecosystem (NPZD) model and a habitat suitability index (HSI) model for southwest Iki Island, northwest Kyushu, Japan. Subsequently, we conducted three numerical experiments with the HSI model, with and without the NPZD model data (with the NPZD model data: phytoplankton or zooplankton concentrations, without the NPZD model data: only the physical data of the ocean). In the HSI model with zooplankton concentrations, we found a stronger positive relationship between the HSI model values and the daily fisheries catch data of <i>U. edulis</i> than that using only the physical variables of the ocean as the environmental parameters. Our study thus indicates that the performance of the fishing ground prediction model will improve by utilizing the lower trophic ecosystem model such as zooplankton concentrations. Furthermore, our results would provide important implications for the efficiency of fishing operations and the conservation and management of this species.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"32 6","pages":"559-570"},"PeriodicalIF":2.6,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48896225","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":"Characterizing dominant patterns of spatiotemporal variation for a transboundary groundfish assemblage","authors":"Lukas B. DeFilippo,&nbsp;James T. Thorson,&nbsp;Cecilia A. O'Leary,&nbsp;Stan Kotwicki,&nbsp;Jerry Hoff,&nbsp;James N. Ianelli,&nbsp;Vladimir V. Kulik,&nbsp;Andre E. Punt","doi":"10.1111/fog.12651","DOIUrl":"10.1111/fog.12651","url":null,"abstract":"<p>Many mobile marine taxa are changing their distributions in response to climate change. Such movements pose a challenge to fisheries monitoring and management, particularly in systems where climate-adaptive and ecosystem-based management objectives are emphasized. While shifts in species distributions can be discerned from long-term fisheries-independent monitoring data, distilling coherent patterns across space and time from such datasets can be challenging, particularly for transboundary stocks. One approach for identifying dominant patterns of spatiotemporal variation that has been widely used in physical atmospheric and oceanographic studies is empirical orthogonal function (EOF) analysis, wherein spatiotemporal variation is separated into time-series of annual factor loadings and spatial response maps. Here, we apply an extension of EOF analysis that has been modified for compatibility with biological sampling data to a combined US–Russian fisheries-independent survey dataset that spans the eastern (United States) and western (Russia) Bering Sea shelf to estimate dominant patterns of spatiotemporal variation for 10 groundfish species at a shelf-wide scale. EOF identified one axis of variability that was coherent with the extent of cold (≤0°C) near-bottom waters (the cold pool) previously shown to be a key influence on species distributions and ecosystem structure for the Bering Sea. However, the leading axis of variability identified by our EOF analysis was characterized by low frequency changes in the distributions of several species over longer time scales. Our analysis has important implications for predicting variation in species distributions over time and demonstrates a widely applicable method for leveraging combined fisheries-independent survey datasets to characterize community-level responses to ecosystem change at basin-wide scales.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"32 6","pages":"541-558"},"PeriodicalIF":2.6,"publicationDate":"2023-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46528303","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":"Stage-specific drivers of Pacific hake (Merluccius productus) recruitment in the California Current Ecosystem","authors":"Cathleen D. Vestfals,&nbsp;Kristin N. Marshall,&nbsp;Nick Tolimieri,&nbsp;Mary E. Hunsicker,&nbsp;Aaron M. Berger,&nbsp;Ian G. Taylor,&nbsp;Michael G. Jacox,&nbsp;Brendan D. Turley","doi":"10.1111/fog.12634","DOIUrl":"10.1111/fog.12634","url":null,"abstract":"<p>Understanding environmental drivers of recruitment variability in marine fishes remains an important challenge in fish ecology and fisheries management. We developed a conceptual life-history model for Pacific hake (<i>Merluccius productus</i>) along the west coast of the United States and Canada to generate stage-specific and spatiotemporally-specific hypotheses regarding the oceanographic and biological variables that likely influence their recruitment. Our model included seven life stages from pre-spawning female conditioning through pelagic juvenile recruitment (age-0 fish) for the coastal Pacific hake stock. Model-estimated log recruitment deviations from the 2020 hake assessment were used as the dependent variable, with predictor variables drawn primarily from a regional ocean reanalysis for the California Current Ecosystem. Indices of prey and predator abundance were also included in our analysis, as were predictors of local- and basin-scale climate. Five variables explained 59% of the recruitment variability not accounted for by the stock–recruitment relationship in the hake assessment. Recruitment deviations were negatively correlated with May–September eddy kinetic energy between 34.5° and 42.5°N, the North Pacific Current Bifurcation Index, and Pacific herring (<i>Clupea pallasii</i>) biomass during the spawner preconditioning stage, alongshore transport during the yolk-sac larval stage, and the number of days between storm events during the first-feeding larval stage. Other important predictors included upwelling strength during the preconditioning stage, the number of calm periods during the first-feeding larval stage, and age-1 hake predation on age-0 pelagic juveniles. These findings suggest that multiple mechanisms affect Pacific hake survival across different life stages, leading to variability in population-level recruitment.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"32 4","pages":"352-389"},"PeriodicalIF":2.6,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48022936","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":"Influence of El Niño-Southern Oscillation on bigeye and yellowfin tuna longline catch per unit effort in the equatorial Pacific","authors":"Réka Domokos","doi":"10.1111/fog.12644","DOIUrl":"10.1111/fog.12644","url":null,"abstract":"<p>Bigeye tuna (BET) and yellowfin tuna (YFT) are economically important target species of pelagic fisheries worldwide, especially for tropical Pacific nations whose economies and food sources are heavily affected by commercial and sustenance tuna fishing. The El Niño-Southern Oscillation (ENSO) has a strong effect on the oceanographic conditions in the equatorial Pacific, including BET and YFT equatorial habitat and fishing grounds. For optimal fisheries management, the effects of environmental variability such as ENSO on the stocks and on the performance of fisheries must be known and predictable. However, besides some model predictions, the effects of ENSO on these two tuna species are not well understood. In this study, I investigate the statistical relationships between past ENSO conditions and equatorial fisheries using the Multivariate ENSO Index, sea surface temperature (SST), and catch and effort records from the longline fisheries in the region. Results of this study indicate that El Niño events have both delayed and concurrent positive effects on BET and YFT catch per unit effort (CPUE). The delayed positive ENSO effect on CPUE is hypothesized to be the result of enhanced recruitment acting via different mechanisms in the west than in the east. The concurrent positive effects on CPUE could be due to catchability, abundance, and/or vertical distribution of BET and YFT relative to fishing gear and require further investigation. Further exploration of the mechanisms that may underlie the results presented here could lead to predictability of CPUE of these two tuna species.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"32 6","pages":"527-540"},"PeriodicalIF":2.6,"publicationDate":"2023-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.12644","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47062559","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":"Trivial gain of downscaling in future projections of higher trophic levels in the Nordic and Barents Seas","authors":"I. Nilsen, F. Fransner, A. Olsen, J. Tjiputra, R. Hordoir, C. Hansen","doi":"10.1111/fog.12641","DOIUrl":"https://doi.org/10.1111/fog.12641","url":null,"abstract":"","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"1 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63459409","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":"Trivial gain of downscaling in future projections of higher trophic levels in the Nordic and Barents Seas","authors":"Ina Nilsen,&nbsp;Filippa Fransner,&nbsp;Are Olsen,&nbsp;Jerry Tjiputra,&nbsp;Robinson Hordoir,&nbsp;Cecilie Hansen","doi":"10.1111/fog.12641","DOIUrl":"https://doi.org/10.1111/fog.12641","url":null,"abstract":"<p>Downscaling physical forcing from global climate models is both time consuming and labor demanding and can delay or limit the physical forcing available for regional marine ecosystem modelers. Earlier studies have shown that downscaled physics is necessary for capturing the dynamics of primary production and lower trophic levels; however, it is not clear how higher trophic levels respond to the coarse resolution physics of global models. Here, we apply the Nordic and Barents Seas Atlantis ecosystem model (NoBa) to study the consequences of using physical forcing from global climate models versus using that from regional models. The study is therefore (i) a comparison between a regional model and its driving global model to investigate the extent to which a global climate model can be used for regional ecosystem predictions and (ii) a study of the impact of future climate change in the Nordic and Barents Seas. We found that few higher trophic level species were affected by using forcing from a global versus a regional model, and there was a general agreement in future biomass trends and distribution patterns. However, the slight difference in temperature between the models dramatically impacted Northeast Arctic cod (<i>Gadus morhua</i>), which highlights how species projection uncertainty could arise from poor physical representation of the physical forcing, in addition to uncertainty in the ecosystem model parameterization.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"32 5","pages":"479-493"},"PeriodicalIF":2.6,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.12641","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50150929","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":"Shelf break exchange processes influence the availability of the northern shortfin squid, Illex illecebrosus, in the Northwest Atlantic","authors":"Sarah L. Salois,&nbsp;Kimberly J. W. Hyde,&nbsp;Adrienne Silver,&nbsp;Brooke A. Lowman,&nbsp;Avijit Gangopadhyay,&nbsp;Glen Gawarkiewicz,&nbsp;Anna J. M. Mercer,&nbsp;John P. Manderson,&nbsp;Sarah K. Gaichas,&nbsp;Daniel J. Hocking,&nbsp;Benjamin Galuardi,&nbsp;Andrew W. Jones,&nbsp;Jeff Kaelin,&nbsp;Greg DiDomenico,&nbsp;Katie Almeida,&nbsp;Bill Bright,&nbsp;Meghan Lapp","doi":"10.1111/fog.12640","DOIUrl":"10.1111/fog.12640","url":null,"abstract":"<p>The United States Northern Shortfin squid fishery is known for its large fluctuations in catch at annual scales. In the last 5 years, this fishery has experienced increased availability of <i>Illex illecebrosus</i> along the Northeast US continental shelf (NES), resulting in high catch per unit effort (CPUE) and early fishery closures due to quota exceedance. The fishery occurs within the Northwest Atlantic, whose complex dynamics are set up by the interplay between the large-scale Gulf Stream, mesoscale eddies, Shelfbreak Jet, and shelf-slope exchange processes. Our ability to understand and quantify this regional variability is requisite for understanding the availability patterns of <i>Illex</i>, which are largely influenced by oceanographic conditions. In an effort to advance our current understanding of the seasonal and interannual variability in this species' relative abundance on the NES, we used generalized additive models to examine the relationships between the physical environment and hotspots of productivity to changes in CPUE of <i>I. illecebrosus</i> in the Southern stock component, which comprises the US fishery. Specifically, we derived oceanographic indicators by pairing high-resolution remote sensing data and global ocean reanalysis physical data to high-resolution fishery catch data. We identified a suite of environmental covariates that were strongly related to instances of higher catch rates. In particular, bottom temperature, warm core rings, subsurface features, and frontal dynamics together serve as indicators of habitat condition and primary productivity hotspots, providing great utility for understanding the distribution of <i>Illex</i> with the potential for forecasting seasonal and interannual availability.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"32 5","pages":"461-478"},"PeriodicalIF":2.6,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fog.12640","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47290507","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":"Restricted connectivity for cobia Rachycentron canadum (Perciformes: Rachycentridae) in the Western Atlantic Ocean","authors":"Maria Raquel M. Coimbra,&nbsp;Emilly Benevides,&nbsp;Renata da Silva Farias,&nbsp;Bruno C. N. R. da Silva,&nbsp;Sara Cloux,&nbsp;Vicente Pérez-Muñuzuri,&nbsp;Manuel Vera,&nbsp;Rodrigo Torres","doi":"10.1111/fog.12642","DOIUrl":"10.1111/fog.12642","url":null,"abstract":"<p>Cobia (<i>Rachycentron canadum</i>) is a coastal pelagic migratory fish species of tropical and subtropical waters, where it is an important game fish and it has been commercially expanded in offshore aquaculture systems. Understanding population connectivity is of utmost importance to the sustainable use and conservation of aquatic resources, and information on genetic diversity and structure is key element in unraveling differentiation when no clear physical barriers exist. In the present study, cobia genetic diversity and structure were depicted using mitochondrial DNA cytochrome b sequencing and microsatellite genotyping in samples from the Southwestern Atlantic and showed that a major single population inhabits the southern hemisphere. Cytochrome b sequencing also suggested that the Indian Ocean is the center of origin for this species' diversification. A hierarchical analysis of AMOVA compared sampling locations from the Northwestern Atlantic (from a previous study) with the Southwestern ones using nine shared microsatellite markers. Differentiation among groups (F_<i>CT</i> <i>=</i> 0.41), Bayesian clustering analysis, and complementary ordination analyses (by discriminant analysis of principal components [DAPC] and factorial correspondence analysis [3D-FCA]) presented a clear separation between the two hemispheres, supported by a Lagrangian model that explained the ocean dynamics over larval retention on the Western Atlantic. Another genetic subgroup intermingled with the main Southwestern group may also exist further south, probably associated with the Vitória-Trindade Ridge and the local current systems. The distribution of this species in metapopulations is of extreme relevance for fisheries and fish hatcheries management in the Atlantic Ocean.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"32 6","pages":"495-508"},"PeriodicalIF":2.6,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45969298","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":"Comparison of machine learning models within different spatial resolutions for predicting the bigeye tuna fishing grounds in tropical waters of the Atlantic Ocean","authors":"Liming Song,&nbsp;Tianlai Li,&nbsp;Tianjiao Zhang,&nbsp;Hengshou Sui,&nbsp;Bin Li,&nbsp;Min Zhang","doi":"10.1111/fog.12643","DOIUrl":"10.1111/fog.12643","url":null,"abstract":"<p>To understand the effects of the machine learning models and the spatial resolutions on the prediction accuracy of bigeye tuna (<i>Thunnus obesus</i>) fishing grounds, logbook data of 13 Chinese longliners operating in the high seas of the Atlantic Ocean from 2016 to 2019 were collected. The environmental factors were selected based on the correlation analysis of calculation of catch per unit effort (CPUE) and the marine vertical environmental factors. Five machine learning models: random forest, gradient-boosting decision tree, <i>K</i>-nearest neighbor, logistic regression and stacking ensemble learning (STK) within four spatial resolutions of .5° × .5°, 1° × 1°, 2° × 2° and 5° × 5° grids were constructed and compared. Results showed that (1) the prediction performance of STK model was the best, with the highest scores of the four evaluation indexes, accuracy (Acc), precision (P), recall (R), and F1-score (F1), and the highest correct prediction rate for predicting “high CPUE fishing ground”; (2) models within the spatial resolution of 1° × 1° grids predicted the better results compared with .5° × .5°, 2° × 2° and 5° × 5° grids; (3) the vertical environmental factors selected based on the correlation analysis could be used as reliable predictors in the models. Results suggested that using STK within 1° × 1° grids could improve the generalization performance and prediction accuracy for predicting the bigeye tuna fishing grounds in the Atlantic Ocean.</p>","PeriodicalId":51054,"journal":{"name":"Fisheries Oceanography","volume":"32 6","pages":"509-526"},"PeriodicalIF":2.6,"publicationDate":"2023-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43887142","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}