Fisheries Research最新文献

{"title":"Maximizing growth, efficiency, and cost-effectiveness: Evaluating feed strategies for flathead lobsters","authors":"Rungkan Klahan ,&nbsp;Kritsana Krajabthong ,&nbsp;Krit Chaiwong","doi":"10.1016/j.fishres.2024.107249","DOIUrl":"10.1016/j.fishres.2024.107249","url":null,"abstract":"<div><div>The study aimed to identify the most suitable feed for flathead lobsters (<em>Thenus oreintalis</em>) regarding growth performance and cost-effectiveness. Four treatments were evaluated, including sinking pellet (shrimp feed), green mussel, clam, and mackerel, with each treatment replicated three times. Wild flathead lobsters with sizes ranging from 60 to 70 g were randomly assigned to each treatment group, with five lobsters per replication. The lobsters were fed twice daily with different feeds for 90 days in a recirculating closed system. Results showed that flathead lobsters fed with green mussels had the highest growth performance and utilization while having lower feed costs and total costs than other treatments (P &lt; 0.05). The proximate analysis of flesh and exoskeleton revealed that flathead lobsters fed with sinking pellets had the highest protein percentage. In contrast, those fed with green mussels had the highest lipid and chitin percentage. Moreover, protease activity extracted from the hepatopancreases of flathead lobsters fed with green mussels exhibited the highest activity, while the amylase and lipase activity varied among groups. The chitin structure analysis using SEM, FTIR, and FTIR assays revealed that the feed pattern closely matched the optimal growth and feed utilization, including the B/C ratio, for flathead lobsters cultured in a closed system were green mussels.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107249"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133798","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":"Allocating catches to species in mixed species data – A model-based approach","authors":"D. Parker ,&nbsp;A.E. Punt ,&nbsp;R.A. Deng ,&nbsp;W.N. Venables ,&nbsp;C.M. Dichmont ,&nbsp;A.G. Donovan ,&nbsp;R.A. Kenyon ,&nbsp;T. van der Velde ,&nbsp;M. Miller ,&nbsp;T. Hutton","doi":"10.1016/j.fishres.2024.107240","DOIUrl":"10.1016/j.fishres.2024.107240","url":null,"abstract":"<div><div>Stock assessments should ideally be conducted at the species level, but this can be difficult when commercial catches are reported by species group rather than by species. This is a common problem if species are hard to identify or it is too time consuming to do so. Species split algorithms are applied in such cases. We outline a GAM-based approach for splitting species-aggregated catch and effort data to species and apply them to two species groups (tiger and endeavour prawns) in Australia’s Northern Prawn Fishery. The best models incorporate spatial, temporal and biophysical covariates, demonstrating strong explanatory power and robust performance in cross-validation tests. The results suggest that the annual split to species by location and day of the year is constant over time for the endeavour prawns. However, evidence exists for long-term trends (i.e., non-stationary) when splitting the tiger prawns. This highlights the importance of regularly updating this information.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107240"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133802","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":"What is an appropriate spatial scale for ecosystem based fishery management of kōura, spiny lobster Jasus edwardsii, in the Hauraki Gulf Marine Park, Aotearoa New Zealand?","authors":"Alison MacDiarmid","doi":"10.1016/j.fishres.2024.107261","DOIUrl":"10.1016/j.fishres.2024.107261","url":null,"abstract":"<div><div>Ecosystem based fishery management (EBFM) remains an aspiration in Aotearoa New Zealand where single species fisheries assessments at large quota management area (QMA) spatial scales are standard. This review of the available information for the spiny lobster or kōura (<em>Jasus edwardsii</em>) in the Hauraki Gulf Marine Park (part of the CRA2 QMA) indicates that the present large scale fisheries assessment violates the modelling assumption of a unit stock because of smaller scale spatial patterns of puerulus settlement, juvenile and adult movement, abundance, ecological interactions, and fishing. While EBFM at the reef scale would be consistent with the limited movement of juvenile and adult kōura among adjacent reefs, high information requirements at this small scale demand a stepped transition from the QMA scale. Assessments of the CRA2 kōura stock based on six subregions would allow the identification of routes for population rebuilding in each sub-region and the development of EBFM of kōura at scales more relevant to its biology, ecology and fisheries as well as the communities with a stake in its sustainability. Management at these scales will require using existing fine-scale data where it exists and consideration of new ways to collect the required data at a suitable spatial scale to help fill the information gaps.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107261"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133951","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":"Fish ID face-off: A comparison of genetic barcoding and otolith shape analysis for streamlining species identification of mesopelagic fishes","authors":"Lydia N. Walton ,&nbsp;Micah Quindazzi ,&nbsp;Stéphane Gauthier ,&nbsp;Catherine Stevens","doi":"10.1016/j.fishres.2024.107254","DOIUrl":"10.1016/j.fishres.2024.107254","url":null,"abstract":"<div><div>Identifying fish to species level is important for fisheries research as it ensures the accuracy of catch data reported by fishing vessels and informs best management strategies for harvested taxa. Genetic methods are one of the most common techniques used for identifying fish species but can be time-consuming and costly and may lead to incorrect or incomplete identifications if genetic baselines do not exist. Visual identifications using otolith shape are an inexpensive alternative that can be used to identify large numbers of fish samples quickly and with high accuracy. The objective of this study was to compare two methods of taxonomic identification (<em>i.e.</em>, DNA barcoding of the COI-5P marker and visual identifications using body morphology, distinguishing features and otolith shape) for 240 specimens of mesopelagic fishes as they occupy a critical role in marine food webs. We also tested the effectiveness of geometric morphometrics in delineating species of mesopelagic fishes based on otolith shape. Our results showed that visual identifications agreed with genetic identifications 89 % of the time, and that both techniques were effective for identifying mesopelagic fishes. Additionally, we found that geometric morphometrics were successful in distinguishing mesopelagic fishes using otolith shape 86 % of the time. Otolith shape is a useful tool for the taxonomic identification of mesopelagic fishes in the Northeast Pacific Ocean and should be employed with higher frequency by fisheries researchers, especially in the absence of taxonomic or genetic expertise.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107254"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133984","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":"Time series of otolith growth patterns reflects oxygen depletion tolerance in an abundant mesopelagic fish species","authors":"Francesco Saltalamacchia ,&nbsp;Martine Røysted Solås ,&nbsp;Anne Gro Vea Salvanes ,&nbsp;Arild Folkvord","doi":"10.1016/j.fishres.2024.107258","DOIUrl":"10.1016/j.fishres.2024.107258","url":null,"abstract":"<div><div>Mesopelagic fishes play a key role in marine ecosystems worldwide and are considered a potential future resource for fisheries. It is therefore crucial to fully understand their long-term growth drivers and ability to respond to ongoing global changes. In the last decade, reduced water exchange due to the warming of the North Atlantic Ocean has caused oxygen depletion in the basin water of Masfjorden, a deep Norwegian fjord hosting a large biomass of mesopelagic fishes. Semi-enclosed estuarine systems such as fjords, characterised by strong ecological and physical gradients, provide unique conditions to study the effects of environmental change on marine populations. Drawing on this natural infrastructure and a long-standing annual survey, we aimed to describe general patterns of variation and assess whether low-oxygenated waters affect the growth of one of the key mesopelagic species in the North Atlantic, the glacier lanternfish <em>Benthosema glaciale</em> (Myctophidae). We collected biological samples and environmental information spanning several years before, during and after a prolonged hypoxic period. Using otolith annual increments as a proxy for individual growth in a mixed-effects model framework, we examined growth variability in relation to internal (individual-specific) and environmental factors. Adult fish demonstrated tolerance to the measured environmental fluctuations, with minimal changes in growth trajectories. While ocean deoxygenation poses a major challenge to marine regions at a global scale, the resilience of <em>B. glaciale</em> to mild hypoxia suggests promising prospects for population persistence.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107258"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133781","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":"Utilizing the random forest algorithm and interpretable machine learning to inform post-stratification of commercial fisheries data","authors":"Jason Gasper ,&nbsp;Jennifer Cahalan","doi":"10.1016/j.fishres.2024.107253","DOIUrl":"10.1016/j.fishres.2024.107253","url":null,"abstract":"<div><div>Federal groundfish fisheries off Alaska are managed based on near-real time estimates of catch generated using a combination of data from the North Pacific Groundfish and Pacific Halibut Observer Program, which deploys observers and Electronic Monitoring systems into the fisheries to sample catch, and industry-reported information. Catch is carefully monitored against limits that are based on biological constraints, quota allocations, or to control discard amounts. However, estimates of fish discarded at-sea (not retained for sale) can have large variance due to factors such as fishing behavior, species-specific vulnerability to fishing, and sample sizes. Post-stratification is a statistical approach widely used to improve the precision of catch estimates within a population because it controls for variance while also not relying on covariates known prior to sampling, which can be costly to collect or are unknown. Strategic use of post-stratification may increase the precision of estimates when compared to designs without post-stratification. However, choosing fishery characteristics to define post-strata may be elusive due to the high dimensionality of fishery data and complexity of creating post-strata that are optimized for multiple species. We propose a novel application of random forest classification and design-based estimation to explore multivariate post-stratification designs. These designs were evaluated by selecting the best performing trees from an ensemble using design-based estimation metrics. Results showed a large improvement in the precision of estimates by using the best-performing trees to label data and create post-strata. Moreover, through the use of subject matter expertise to evaluate the best performing trees, this method identified combinations of covariates that were not considered in previous estimation designs, and allows for exploration and testing of alternative post-strata designs that could be implemented in a management system.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107253"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133989","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":"Varying organic content in fish otoliths: Effects on SIMS-based δ18O measurements and possible corrections","authors":"Timo D. Rittweg ,&nbsp;Michael Wiedenbeck ,&nbsp;Jan Fietzke ,&nbsp;Clive Trueman","doi":"10.1016/j.fishres.2024.107239","DOIUrl":"10.1016/j.fishres.2024.107239","url":null,"abstract":"<div><div>Varying organic contents in otoliths have complex and sometimes counterintuitive effects on intra-otolith δ¹⁸O measurements. This is often addressed by roasting otoliths or applying fixed corrections, however, the underlying chemical and physiological mechanisms involved are poorly understood and have not been tested in a quantitative manner, potentially rendering such corrections unreliable. Using high-resolution secondary ion mass spectrometry (SIMS) measurements of δ¹⁸O values paired with OH/¹⁶O ion ratios as organic proxy, we derived quantitative relationships of these measurements over the entire life of a large sample of northern pike (<em>Esox lucius</em>) otoliths from freshwater and brackish habitats. We assessed OH/¹⁶O ion count ratio as an organic tracer, and estimated its relationship with δ¹⁸O determinations. We developed a pointwise correction approach that accounted for variations in otolith organic contents. OH/¹⁶O ion ratio profiles agreed with other organic proxies, confirming them as reliable tracer of organic content. We detected an inverse relationship between δ¹⁸O values and OH/¹⁶O ion ratio, with elevated OH/¹⁶O ion ratios near otolith cores. OH/¹⁶O ratios decreased with distance to the core. Pairwise corrections for the effect of OH/¹⁶O ratios on δ¹⁸O values resulted in a mean offset between uncorrected and corrected values of 0.52 ‰, suggesting an approximately 2°C bias towards warmer temperature if uncorrected data were to be used for δ¹⁸O thermometry. Simultaneous determination on organic- and inorganic-bound oxygen resulted in a negative offset of δ¹⁸O, which varies with the life history of individual fish. Varying offsets in δ¹⁸O values within individual life histories could be accounted for using our correction. We recommend future SIMS-based δ¹⁸O thermometry studies to estimate the local organic content to assess whether correction is warranted. We further offer more general recommendations on how future studies may assess whether corrections for organics are necessary.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107239"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133794","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":"“Toki”, a light low-cost video system for seabed research: Performance and precision of Tehuelche scallop (Aequipecten tehuelchus) survey estimates in San José Gulf, Argentina","authors":"Gastón Trobbiani ,&nbsp;Getino Mamet Leandro ,&nbsp;Irigoyen Alejo ,&nbsp;Parma Ana María","doi":"10.1016/j.fishres.2024.107248","DOIUrl":"10.1016/j.fishres.2024.107248","url":null,"abstract":"<div><div>The monitoring of benthic biomass and biodiversity is essential for fisheries management and environmental impact assessments. In the case of commercial species, such as Tehuelche scallop (<em>Aequipecten tehuelchus</em>), accurate information on stock density and distribution is key for regulating the harvest. The standard survey method used to estimate abundance of Tehuelche scallops in San José Gulf, Argentine Patagonia, based on visual counts obtained by divers, is labor-intensive and limited to diving depths. This study introduces a light low-cost video remote system, named “Toki”, for monitoring scallop beds from small boats. Toki consists of a steel pyramidal structure that houses two cameras, capable of capturing georeferenced high-definition images. The performance of Toki for estimating the density and size composition of scallops was evaluated. The results demonstrate that Toki provides efficient and accurate density estimates, with estimation errors that vary with observer experience and environmental factors such as bottom algal cover. The size frequency distribution obtained from Toki aligned well with that of hand-collected samples, making it possible to obtain size-composition information for beds beyond diveable depths. Toki offers advantages in terms of spatial coverage, simple survey logistics and permanent data records. While there are some limitations, such as processing time for image analysis, future developments based on artificial intelligence may overcome these challenges. Toki has the potential to improve the regular monitoring of scallop beds.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107248"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133743","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":"A mathematical proof comparing the statistical properties between two common approaches for parameterizing sex-composition likelihoods in fishery stock assessments","authors":"Matthew LH. Cheng ,&nbsp;Peter-John F. Hulson ,&nbsp;Daniel R. Goethel ,&nbsp;Curry J. Cunningham","doi":"10.1016/j.fishres.2024.107231","DOIUrl":"10.1016/j.fishres.2024.107231","url":null,"abstract":"<div><div>Two primary methods for parameterizing sex-specific age and length composition likelihoods in fishery stock assessments exist, which we refer to as the ‘Joint and ‘Split’ approaches. When using the ‘Joint’ approach, sex-composition data are assumed to arise from a single statistical model that describes the probability of sampling across all ages and sexes in a given year. By contrast, the ‘Split’ approach assumes that sex-composition data arises from several statistical models: sex-specific models that describe the probability of sampling ages within each sex, and an additional model that describes the sex-ratio information from composition data. In this mathematical proof, we derive the statistical properties of both approaches under multinomial and Dirichlet-multinomial sampling and show that they produce equivalent model expectations. However, we illustrate that the ‘Split’ approach leads to smaller assumed variances when sampling follows a Dirichlet-multinomial distribution, because overdispersion acts independently within each sex rather than jointly across sexes. Given that both approaches yield equivalent model expectations, we generally recommend using the ‘Joint’ approach for parameterizing sex-composition likelihoods. The ‘Joint’ approach is simpler to implement, aligns with most fisheries sampling designs, and is able to jointly account for overdispersion and sampling correlations across sexes. However, we acknowledge that in some cases, the ‘Split’ approach may be more appropriate.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107231"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133800","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":"Stock assessment good practices: The crescendo of CAPAM’s workshop series and their consequent special issues","authors":"Mark N. Maunder,&nbsp;Andre E. Punt,&nbsp;Rishi Sharma,&nbsp;Richard D. Methot","doi":"10.1016/j.fishres.2024.107211","DOIUrl":"10.1016/j.fishres.2024.107211","url":null,"abstract":"","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107211"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133961","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}