Fisheries Research最新文献

{"title":"Estimating the trapping area and density of common whelk (Buccinum undatum) using experimental fishing","authors":"Matthew J. Garratt,&nbsp;Isobel S.M. Bloor,&nbsp;Matthew T. Coleman,&nbsp;Charlotte N. Colvin,&nbsp;Jan Geert Hiddink,&nbsp;Natalie Hold,&nbsp;Stuart R. Jenkins","doi":"10.1016/j.fishres.2025.107320","DOIUrl":"10.1016/j.fishres.2025.107320","url":null,"abstract":"<div><div>For many species targeted by static gear fisheries, the relationship between catch per unit effort (CPUE) and density on the seabed is poorly understood. One aspect that is crucial in understanding this relationship is the area from which catches are drawn, known as the trapping area, yet this remains largely unquantified. In this paper we investigate the size of the trapping area for the commercially important common whelk (<em>Buccinum undatum</em>) by studying variations in CPUE in relation to the distance between pots. With declining spacing, the sphere of attraction will increasingly overlap, leading to reductions in catches and allowing the density of catchable animals to be estimated. Experimental fishing took place with pot distances ranging from 4 to 50 m, with catches recorded for over 500 pots over a week-long period. In addition to pot spacing, deployment location and haul date were significant factors influencing CPUE. For the study site, and based on environmental conditions at the time, the trapping area was estimated to be 120 m², indicating whelk pots spaced at least 12–13 m apart are likely to fish independently of each other. This resulted in a density estimate of 0.9 individuals m⁻², with spatial variation between 0.4 and 1.2 individuals m⁻². Results suggest pot spacings in the local fishery are sufficient to avoid interactions, and there is potential to predict densities from commercial CPUE, although further work is needed to understand variability in the size of the trapping area in relation to environmental and biotic factors.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"284 ","pages":"Article 107320"},"PeriodicalIF":2.2,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610779","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":"Marking Bolinus brandaris (Gastropoda: Muricidae) shells","authors":"Sílvia Peréz-Mayol ,&nbsp;Montserrat Ramón ,&nbsp;Joan Mir-Arguimbau ,&nbsp;Beatriz Morales-Nin","doi":"10.1016/j.fishres.2025.107329","DOIUrl":"10.1016/j.fishres.2025.107329","url":null,"abstract":"<div><div>Marking biominerals is a well-established technique for validating and monitoring the growth of calcified marine organisms. <em>Bolinus brandaris,</em> a commercially valuable gastropod in the Mediterranean and Portugal, has an unknown growth and age profile, which hinders its exploitation. The main objective of this study was to determine the effectiveness of several shell-marking techniques: two external marks (plastic label tags and nail polish), and internal calcein staining at two concentrations (30 and 60 mg·L⁻¹) and immersion times (3 and 6 hours). After 454 days, mortality remained low, and external marks were well preserved. Of the combinations here tested, calcein treatment at 60 mg·L⁻¹ for 3 hours yielded the clearest fluorescence and best experimental handling. These findings support the combined use of external and internal marking of shells as a reliable method for growth studies in support of science-backed fisheries management decisions.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"285 ","pages":"Article 107329"},"PeriodicalIF":2.2,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143609609","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":"Testing the effect of square mesh window position on Atlantic cod (Gadus morhua) size selectivity in a trawl codend","authors":"Niels Madsen ,&nbsp;Russell B. Millar","doi":"10.1016/j.fishres.2025.107324","DOIUrl":"10.1016/j.fishres.2025.107324","url":null,"abstract":"<div><div>Atlantic cod (<em>Gadus morhua</em>) is one of the most economically important species for commercial fisheries in the Northern Atlantic, but the stocks have been declining in many areas for decades. Few size selectivity studies on cod in directed trawl fisheries for gadoid species have been conducted in the Greater North Sea ecoregion, where cod is highly economically important. Improvements in the size selectivity of cod trawls are essential to improve the exploitation pattern because there is a wide range of challenges. Square mesh net panels are the most used selective device to improve cod selectivity, henceforth referred to as windows (inserted square mesh net panels). The positioning of the window is a main controllable influential factor on cod escape. This study tests the effect of square mesh windows (inserted square mesh net panels) position on cod absolute size selectivity conducted in directed gadoid fisheries in the North Sea and Skagerrak. Four identical 120 mm standard diamond mesh codends (henceforth referred to as a standard codend), designed as those that are commercially used, with a nominal inside mesh size of 120 mm were constructed. Windows with square meshes and a nominal mesh size of 180 mm were inserted in three codends in positions located 0ꟷ3 m, 3ꟷ6 m, and 6ꟷ9 m from the end of the codend and are all allowed to be used by the legislation. The four codends were fished pairwise in a twin trawl rig using the covered codend technique with a total of 20 paired tows (40 hauls). To identify escape proportion during towing separately from haul-back escape, an acoustically released sampler unit (named Minisampler) was attached to each codend cover. The 50 % retention length (L50) and selection range (SR) were estimated for all codends using a generalized additive modelling approach to fit monotone increasing curves. The L50 values of the codends with windows were all statistically significantly higher and around double that of the standard codend. The selectivity curves of the three codends with windows were very similarly shaped and not statistically significantly different. The Minisampler was successfully released in only some hauls, and only four or five hauls for each codend were included in the analysis, giving wide 95 % confidence limits. In the standard codend, only 21 % of the escape of cod &lt; 35 cm occurred during towing. The escape of cod &lt; 35 cm was higher in the codends with windows but still with a marked proportion not escaping during towing (39ꟷ64 %, &lt;35 cm). A window was an efficient way to increase L50, and the window mesh size can be used to control the size of fish allowed to escape.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"284 ","pages":"Article 107324"},"PeriodicalIF":2.2,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610778","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":"Investigating the relative vulnerability of a temperate coastal fish community to a live wrasse pot fishery","authors":"Calum J. Pritchard ,&nbsp;Nabeil K.G. Salama ,&nbsp;Iain Berrill ,&nbsp;Samuel A.M. Martin ,&nbsp;C. Tara Marshall","doi":"10.1016/j.fishres.2025.107327","DOIUrl":"10.1016/j.fishres.2025.107327","url":null,"abstract":"<div><div>The European live wrasse fishery is a data limited fishery without a formal assessment. ICES recommends using the Productivity Susceptibility Analysis (PSA) to determine the relative vulnerabilities of species caught within data-limited fisheries. The PSA framework evaluates species’ relative vulnerability to overexploitation by scoring productivity and susceptibility attributes, from which relative vulnerability is calculated as a combination of these scores. The relative vulnerability of five target species and 55 potential bycatch species was investigated using the PSA framework, and findings were compared with published vulnerability estimates achieved by other methods. One target species, cuckoo wrasse <em>Labrus mixtus</em>, was of major concern, and another, ballan wrasse <em>Labrus bergylta</em>, was of moderate concern. Both are long-lived sequential hermaphrodites and should be prioritised for further quantitative assessment. Two bycatch species, viviparous eelpout <em>Zoarces viviparus</em> and spurdog <em>Squalus acanthias</em>, were of high concern. Both are viviparous fishes with low fecundity and long gestation periods. However, spurdog are distributed outside of the wrasse fishery and have never been reported as bycatch, so this species should not be considered vulnerable to this fishery. These results highlight the need to prioritize data collection for cuckoo and ballan wrasse and establish bycatch reporting for high-concern species. Vulnerability estimates were not consistent with those achieved by other methods, except for spurdog, which were of high concern due to their low productivity. However, discrepancies in the output of these methods are expected as the PSA framework incorporates fishery context, not just life-history traits.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"284 ","pages":"Article 107327"},"PeriodicalIF":2.2,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610777","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":"Identifying capacity limitations and training needs using a stock assessment game","authors":"André E. Punt (Lead author) ,&nbsp;Catherine M. Dichmont ,&nbsp;Natalie A. Dowling ,&nbsp;Roy A. Deng ,&nbsp;Sean Pascoe ,&nbsp;Ingrid van Putten ,&nbsp;Pia Bessell-Browne ,&nbsp;Paul Burch ,&nbsp;Owen Burnell ,&nbsp;Rowan C. Chick ,&nbsp;Simon de Lestang ,&nbsp;Ainslie Denham ,&nbsp;Rubie T. Evans-Powell ,&nbsp;Greg Ferguson ,&nbsp;Ashley M. Fowler ,&nbsp;Alise Fox ,&nbsp;Fay Helidoniotis ,&nbsp;S. Alex Hesp ,&nbsp;Geoffrey Liggins ,&nbsp;Deepak G. Pazhayamadom ,&nbsp;Geoffrey N. Tuck","doi":"10.1016/j.fishres.2025.107319","DOIUrl":"10.1016/j.fishres.2025.107319","url":null,"abstract":"<div><div>The technical capability of stock assessment analysts, along with characteristics of their operating environment, often limits the development of suitable population dynamics models and affects the accuracy of estimated quantities used for fisheries management. Following a series of training workshops focused on the Stock Synthesis and Stock Assessment Continuum Tool packages, Australian stock assessment scientists were invited to participate in a hypothetical stock assessment “Game” to explore the repercussions , for assessment, of different levels of experience and technical capability in an informal “consequence-free” manner. A fishery data set was generated using a simulation model that represented a stock distributed over 12 regions and harvested by three fishing fleets. The simulation model was made complex by including spatial structure, time-varying selectivity for some fleets, and changes over time in expected recruitment due to the effects of an environmental driver. The analysts self-organized into six (mostly within-agency) groups and reported estimates of current biomass, current depletion and advice regarding the possibility of local depletion. The results of the Game were used to evaluate the approaches used by the various groups and to identify areas where future training would be most beneficial. The results highlighted opportunities for additional training in spatially-explicit population dynamics modelling, the use of methods for pre-processing monitoring data to select appropriate fleet and population structures, as well as the use of methods to provide values related to growth and natural mortality. The groups treated the Game more seriously than was originally intended by the organizers, with several analysts concerned that any errors or assumptions that were mis-matched with the simulated reality may have brought embarrassment to themselves and their agency. Care should therefore be taken that simulation experiments intending to foster collaboration and learning do so in an explicitly understood risk-free environment. Overall, the Game proved valuable in contributing to the development of an Australian community of practice for stock assessment and identifying how to strengthen assessment capabilities.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"284 ","pages":"Article 107319"},"PeriodicalIF":2.2,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610814","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":"Impacts of different types of data integration on the predictions of spatio-temporal models: A fishery application and simulation experiment","authors":"Arnaud Grüss ,&nbsp;Richard L. O’Driscoll ,&nbsp;James T. Thorson ,&nbsp;Jeremy R. McKenzie ,&nbsp;Sira L. Ballara ,&nbsp;Anthony R. Charsley","doi":"10.1016/j.fishres.2025.107321","DOIUrl":"10.1016/j.fishres.2025.107321","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Integrated spatio-temporal models, which enable the sharing of information across locations, time and data sources, are gaining traction for their potential to generate more precise and more accurate estimations compared to models fitted to single data sources. Standard integrated spatio-temporal models combine multiple data sources via a catchability factor. Recently, spatially varying catchability (SVC) integrated spatio-temporal models were developed to implement data integration via the estimation of an SVC term for the least reliable data sources. Expanded-domain integrated spatio-temporal models are models integrating data from different spatial areas. Spatio-temporal models can combine standard or SVC integrated modelling with expanded-domain integrated modelling. The above-mentioned types of data integration have never been evaluated through a comparative analysis. Here, we investigate the impacts of these different types of data integration on the predictions of spatio-temporal models, via an application to the southern hake (&lt;em&gt;Merluccius australis&lt;/em&gt;) HAK4 stock, where the bottom trawl data collected within the New Zealand observer programme are integrated with data from five different bottom trawl research surveys, and a simulation experiment. In total, six models were compared in the present study, where the three last models constitute expanded-domain integrated models: (Model 1) a model fitted to observer-only data for HAK4; (Model 2) a standard integrated model fitted to both observer and survey data for HAK4; (Model 3) an SVC integrated model fitted to both observer and survey data for HAK4; (Model 4) a model fitted to observer-only data for HAK4 and the other New Zealand hake stocks (HAK1 and HAK7); (Model 5) a standard integrated model fitted to both observer and survey data for HAK4, HAK1 and HAK7; and (Model 6) an SVC integrated model fitted to both observer and survey data for HAK4, HAK1 and HAK7. For the simulation experiment, we produced simulated data from Model 5, fitted the six models to the simulated data, and evaluated the performance of the models by comparing their estimations to the simulated data. Overall, the indices obtained with the different types of integrated models outperformed the indices obtained with models using observer-only data: indices from the integrated models were more precise, better matched the traditional stratified random index and had less bias and a smaller root-mean-squared-error, yet characterised uncertainty less well. Moreover, expanded-domain integrated models outperformed other models regarding habitat assessments: (1) they provided insights into spatial density patterns for much larger regions and predicted these patterns more precisely for the area common to all models; and (2) models combining expanded-domain integrated modelling with standard or SVC integrated modelling predicted patterns of distribution shifts and range expansion/contraction more precisely than the e","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"284 ","pages":"Article 107321"},"PeriodicalIF":2.2,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592109","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":"Inter-annual dispersal stability within the Atlantic salmon metapopulation from the Bay of Biscay","authors":"A. Fontaine ,&nbsp;M. Vignon ,&nbsp;H. Tabouret ,&nbsp;A. Holub ,&nbsp;G. Barranco ,&nbsp;S. Bosc ,&nbsp;I. Caux ,&nbsp;D.J. Nachón ,&nbsp;J. Elso ,&nbsp;P. Caballero ,&nbsp;C. Pécheyran ,&nbsp;G. Bareille","doi":"10.1016/j.fishres.2025.107323","DOIUrl":"10.1016/j.fishres.2025.107323","url":null,"abstract":"<div><div>Natural biocomplexity, characterized by genetic and phenotypic diversity, enhances the resilience of metapopulations by buffering against environmental fluctuations and stochastic events. This diversity acts as a natural bet hedge, where different populations may thrive under varying conditions, ensuring the overall stability and survival of the species. Regarding migratory salmonids, the portfolio effect is particularly important due to their complex life cycles and reliance on diverse and interconnected habitats along their ontogenic migration. To date, little is known about the temporal variability of dispersal movements, both in terms of intensity and direction. Yet, dispersal behavior is expected to vary over the next decades, in response to the overwhelming stressors (biotic and abiotic, from natural and anthropogenic sources) that salmonids are facing. In this study, we investigated Atlantic salmon (<em>Salmo salar</em>) dispersal patterns on a regional scale in western Europe, <em>i.e.</em> the Bay of Biscay, using otolith chemistry (Ba/Ca, Sr/Ca, and ⁸⁷Sr/⁸⁶Sr). Our results display significant connectivity between salmon subpopulations, particularly that of the Adour, which appears to be both a source (emigration rate: 1.3 ± 1.0 %) and a sink (immigration rate: 4.9 ± 4.3 %) for related populations. Although changes in Atlantic salmon dispersal could be expected with the acceleration and intensification of global change effects, our study shows very stable philopatric and dispersal rates over the last decade. Combined with genetic studies, our observations suggest that the metapopulation structure may help in the stability of the system, probably via a demographic but also perhaps genetic rescue effect.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"284 ","pages":"Article 107323"},"PeriodicalIF":2.2,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579360","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":"Does increased complexity improve performance: Evaluating a constrained biomass dynamics model and an empirical harvest control rule","authors":"Pia Bessell-Browne ,&nbsp;André E. Punt ,&nbsp;Miriana Sporcic ,&nbsp;Geoffrey N. Tuck ,&nbsp;L. Richard Little","doi":"10.1016/j.fishres.2025.107317","DOIUrl":"10.1016/j.fishres.2025.107317","url":null,"abstract":"<div><div>Biomass dynamics models are a common stock assessment method applied in-data limited situations. We present a management strategy based on a new constrained biomass dynamics model (‘dynamic tier 4’) as an alternative to the currently applied empirical management strategy (‘empirical tier 4’) used in Australia’s Southern and Eastern Scalefish and Shark Fishery (SESSF). The dynamic tier 4 management strategy is constrained because the biomass dynamics model on which it is based involves the assumption that yield corresponding to the biomass target occurred during a pre-specified set of reference years. This is the same assumption that is made by the empirical tier 4 management strategy. Management strategy evaluation is used to evaluate performance among three ways of accounting for error when fitting the dynamic tier 4 approach, and to evaluate performance against the empirical tier 4 management strategy as well as a management strategy based on an integrated assessment implemented using Stock Synthesis (‘tier 1’). Finally, the sensitivity of the empirical tier 4 and dynamic tier 4 management strategies to an incorrect choice for the pre-specified reference years is explored. The results demonstrate improved performance by the dynamic tier 4 management strategy compared to the empirical tier 4 management strategy. As expected, the data-rich, tier 1 management strategy had the best performance. The dynamic tier 4 management strategy has a reduced probability of the stock falling below the limit reference point, reduced catch variability and is less sensitive to incorrect reference year choice than the empirical tier 4 management strategy. These results demonstrate that the dynamic tier 4 management strategy is a suitable alternative to the empirical tier 4 management strategy in the SESSF, and more generally, can be considered as a robust option for forming the basis for management recommendations for data-limited situations.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"284 ","pages":"Article 107317"},"PeriodicalIF":2.2,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548392","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":"The complex age and growth of Chloroscombrus chrysurus: Formation of two increments per year in the otolith and biphasic growth","authors":"Kathleen Angélica Rautenberg ,&nbsp;Dimitris V. Politikos ,&nbsp;Eduardo Luis Cupertino Ballester ,&nbsp;Paulo Ricardo Schwingel ,&nbsp;André Martins Vaz-dos-Santos","doi":"10.1016/j.fishres.2025.107322","DOIUrl":"10.1016/j.fishres.2025.107322","url":null,"abstract":"<div><div>Fish age and growth are essential information for fisheries management and ecological assessment. <em>Chloroscombrus chrysurus</em> is a small pelagic fish distributed along both margins of the Atlantic Ocean, with a key ecological role and fishery relevance. In the Southeastern Brazilian Bight (21°S-28°40'S), it is one of the three main target species of the industrial purse seine fishery, and there is no detailed study of its sagitta otolith focusing on age structure and growth pattern in this area. To this end, a dataset of 1009 otoliths from individuals ranging from 155 to 400 mm TL was analyzed. Techniques to assess the relative growth and absolute growth were used. Both techniques revealed a biphasic growth pattern. The stanza changing point in the otoliths corresponds to a total length of 245.43 mm. Two increments (translucent zones) are formed in the otolith per year. Up to eight increments were observed, corresponding to ages ranging from 0.8 to 4.5 years. The biphasic von Bertalanffy growth model best described the growth of the species: <span><math><mrow><mi>TL</mi><mo>=</mo><mn>356.10</mn><mspace></mspace><msub><mrow><mi>A</mi></mrow><mrow><mi>t</mi></mrow></msub><mo>[</mo><mn>1</mn><mo>−</mo><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo><mn>0.758</mn><mspace></mspace><mrow><mfenced><mrow><mi>t</mi><mo>+</mo><mn>0.0027</mn></mrow></mfenced></mrow></mrow></msup><mo>]</mo></mrow></math></span>, <em>t</em>_<em>h</em> = 2.32 years, <em>h</em> = 0.180. The total length and age of the transitional growth phase correspond to the total length at which all individuals are adults (<em>TL</em>_<em>100</em>), indicating a rapid growth pattern during first maturity, followed by relatively stable length in older individuals. These results represent a novel approach to age and growth of <em>C. chrysurus</em> and provide a standard for accurate age estimation based on otolith analysis for small and medium-sized pelagic species.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"284 ","pages":"Article 107322"},"PeriodicalIF":2.2,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548394","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":"Assessing the applicability of diver-based surveys for monitoring fish populations in lentic lakes","authors":"Michaela Holubová ,&nbsp;Jiří Richta ,&nbsp;Martin Čech ,&nbsp;Lukáš Vejřík ,&nbsp;Vladislav Draštík ,&nbsp;Luboš Kočvara ,&nbsp;Jiří Peterka","doi":"10.1016/j.fishres.2025.107308","DOIUrl":"10.1016/j.fishres.2025.107308","url":null,"abstract":"<div><div>Giving the increasing degradation of aquatic ecosystem, it is important to prioritise harmless methods when selecting appropriate research gear. This study confirmed that Underwater Visual Census (UVC) using SCUBA divers and parallel, depth-stratified transects can produce results comparable to standardized gillnet sampling in terms of fish species proportions in lentic freshwater ecosystems with sufficient water transparency. The proportions of young-of-the-year (YOY) fish were similar between the two methods. In older fish, the species proportions showed minor, non-significant variations between methods. Despite some variability in performance during UVC surveys, this variation is not necessarily indicative of an error but may reflect natural fluctuations in fish distribution. Notably, UVC detected a significantly higher number of fish individuals compared to gillnets. Our findings suggest that UVC is a viable, non-invasive alternative to gillnets for surveying nearshore fish populations, providing comparable data quality with negligible impact on the fish community.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"284 ","pages":"Article 107308"},"PeriodicalIF":2.2,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548393","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}