Fisheries Research最新文献

{"title":"Twenty years of AFORO: New developments and connections enhancing otolith research","authors":"A. Manjabacas ,&nbsp;Ò. Chic ,&nbsp;E. García-Ladona ,&nbsp;V.M. Tuset ,&nbsp;J.R. Morros ,&nbsp;E. Sayrol ,&nbsp;P. Martí-Puig ,&nbsp;J. Forest ,&nbsp;J. Vasconcelos ,&nbsp;A. Lombarte","doi":"10.1016/j.fishres.2024.107242","DOIUrl":"10.1016/j.fishres.2024.107242","url":null,"abstract":"<div><div>Since 2003, with the aim of addressing different issues related to otoliths and the advancement of technologies, AFORO acronym of Anàlisi de FORmes d’Otòlits (otolith shape analysis), a computational environment with a set of tools including a website for this purpose, has gradually expanded its functionality. This implies different ways to measure otoliths in order to obtain different types of information of the same individual. The 2D otoliths shape description using different methods permits the comparison between classical methods and the Wavelet transform, used in the automatic classification system of AFORO. The 3D otoliths description in a few images opens the possibility of classifications using volumetric information, which they have performed well. The data of relationships between otolith and fish length in AFORO is used in predator-prey studies. Our website offers the possibility to display otolith georeferencing information interactively. Furthermore, the automatic classification system has been improved by incorporating geographic filters based on georeferenced data. The diverse information that AFORO offers on the otoliths opens the possibility to approach new studies or to improve the existing ones, combining this information or applying the most appropriate one to the specific problem. Classification cases with Wavelets that have been improved by introducing geographical area information will be presented. In addition, Deep Learning algorithms will be introduced by performing classifications with a small subset of otoliths of species which contain a sufficient number of specimens (&gt;8).</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107242"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133803","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":"Comparing top- and bottom-opening Nordmøre-grids in south-eastern Australian estuarine squid trawls","authors":"Matt K. Broadhurst","doi":"10.1016/j.fishres.2024.107246","DOIUrl":"10.1016/j.fishres.2024.107246","url":null,"abstract":"<div><div>In response to prolonged, regional jellyfish (mostly <em>Catostylus mosaicus</em>) blooms in the Hawkesbury River, south-eastern Australia, trawlers targeting broad squid, <em>Uroteuthis</em> sp. 3 and Luminous Bay squid, <em>U. noctiluca</em> have modified their trawls to include mechanical-separating devices, and mostly bottom-opening Nordmøre-grids. Three experiments were done here to incrementally assess the relative performances of Nordmøre-grids for maintaining squid and by-product (&gt;35 mostly fish species) catches, while reducing jellyfish and other bycatch. The Nordmøre-grids had identical bar spaces (∼42 mm), sizes (1200 × 725 mm), installation angles (30°) and escape-exit designs (with a mesh cover) but were compared as (1) top- or bottom-opening orientations with long guiding panels in the extension, and then bottom-opening designs with either (2) long or short guiding panels or (3) short or no guiding panels. There were few significant differences in catches of key groups or species between any of the grids, reiterating the generic utility of the design for consistently separating out large unwanted organisms (i.e. jellyfish). Nevertheless, trawls with the top-opening design retained significantly fewer small- and medium-sized silver biddy, <em>Gerres subfasciatus</em> (a by-product species) and slightly less total by-product (attributed to a tendency for some fish to rise in the extension). Among the bottom-opening designs, using a short guiding panel and a modification involving opening meshes opposite the leading edge of the panel allowed one strong-swimming bycatch species (silver trevally, <em>Pseudocaranx georgianus</em>) to escape, although there were few other perceived benefits. While Nordmøre-grids permit squid trawling during moderate jellyfish blooms in the Hawkesbury River, alternative catching methods (e.g. jigging) might also warrant investigation for more holistically improving environmental efficiencies.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107246"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133804","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":"Evidence of growth-selective mortality of European anchovy larvae in the Bay of Biscay based on otolith microstructure analysis","authors":"Naroa Aldanondo ,&nbsp;Agurtzane Urtizberea,&nbsp;Unai Cotano","doi":"10.1016/j.fishres.2024.107259","DOIUrl":"10.1016/j.fishres.2024.107259","url":null,"abstract":"<div><div>We tested the hypothesis that anchovy juveniles that survived until autumn in the Bay of Biscay were the larger and faster-growing members of their cohorts. Anchovy larvae and post-larvae were collected in August 2005 and juveniles in September-October 2005 in the south-eastern part of the Bay of Biscay. Their otoliths were analysed, and larval, post-larval, and juvenile hatch date distributions, as well as daily growth patterns, were estimated. Subsequently, larval growth trajectories of juveniles were compared with those of larvae and post-larvae from the same cohort. Additionally, a generalised additive mixed model was applied to characterize otolith growth trajectory. Juveniles exhibited higher growth rates than larvae and post-larvae, providing evidence of growth-selective mortality. These differences were observed from 16 to 20 days onwards and could be related to the onset of diel vertical migration and/or larval aggregation. Our results support the hypothesis that fast growth increases the survivorship of anchovy during the larval stage. These findings contribute to a better understanding of the role of predation pressure on anchovy survival in the Bay of Biscay.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107259"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133988","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":"Accounting for post-release mortality in data-limited, length-based assessments for four demersal fish species with varying life histories","authors":"Brett Crisafulli ,&nbsp;Sybrand Alexander Hesp ,&nbsp;Ebenezer Afrifa-Yamoah ,&nbsp;Ute A Mueller ,&nbsp;Karina L Ryan ,&nbsp;David V Fairclough ,&nbsp;Norman G Hall ,&nbsp;Johnny Lo","doi":"10.1016/j.fishres.2024.107238","DOIUrl":"10.1016/j.fishres.2024.107238","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Released (or discarded) fish from recreational and commercial line fisheries can experience significant levels of post-release mortality (PRM), affecting sustainability. Although PRM effects are often considered in data-rich (integrated model) assessments, this is uncommon in data-limited assessments. This study investigates impacts of PRM when applying data-limited, length-based assessment methods for four reef-dwelling demersal fish species in temperate Western Australia (&lt;em&gt;Glaucosoma hebraicum&lt;/em&gt;, &lt;em&gt;Chrysophrys auratus&lt;/em&gt;, &lt;em&gt;Choerodon rubescens&lt;/em&gt; and &lt;em&gt;Epinephelides armatus&lt;/em&gt;). These species differ considerably in their biology and susceptibility to PRM. For each species simulations were undertaken to (1) evaluate the reliability of a length-based catch curve (LBCC) method for estimating fishing mortality (&lt;span&gt;&lt;math&gt;&lt;mi&gt;F&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;) and selectivity parameters, and (2) predict the impacts of different PRM levels on values of relative biomass, i.e. ratios of fished to unfished equilibrium spawning biomass (&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;rel&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;), estimated using a length-based equilibrium analysis (LBEA). LBEA extends length-based per-recruit analysis to incorporate a stock-recruitment relationship as well as allow for PRM. On average, estimates of &lt;span&gt;&lt;math&gt;&lt;mi&gt;F&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; and selectivity parameters from LBCC for each species were unbiased when applied to simulated data. Precision decreased, however, when LBCC was fitted to data simulated with recruitment variation. For a given &lt;span&gt;&lt;math&gt;&lt;mi&gt;F&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;, increased PRM levels reduced &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;rel&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; for all species, with the extent of impacts varying depending on species biology. LBCC was then applied to two actual datasets, firstly to lengths for all fish that had either been retained or released during historical recreational fishing trips (to estimate gear selectivity), and secondly to length data for retained fish from recent charter fishing (to estimate &lt;span&gt;&lt;math&gt;&lt;mi&gt;F&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; and selectivity of landings). The resultant estimates were then used in LBEA to estimate &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;rel&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; with and without accounting for PRM. Relative impacts of PRM varied among species depending on their biology and size limits. While PRM was predicted to have limited impact on &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;rel&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; for &lt;em&gt;C. rubescens&lt;/em&gt; (as fish are not fully selected by the gear until they attain a relatively large size), accounting for PRM resulted in estimates of &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;rel&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; (at their current estimated &lt;span&gt;&lt;math&gt;&lt;mi&gt;F&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; levels) being reduced by 31 % for &lt;em&gt;G. hebraicum&lt;/em&gt;, 36 % for &lt;em&gt;C. auratus&lt;/em&gt; ","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107238"},"PeriodicalIF":2.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744598","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":"Long-term tagging reveals variable escapement of stocked Muskellunge among four Ohio reservoirs: Consequences for managing reservoir fisheries","authors":"Kevin S. Page ,&nbsp;Curtis P. Wagner","doi":"10.1016/j.fishres.2024.107230","DOIUrl":"10.1016/j.fishres.2024.107230","url":null,"abstract":"<div><div>Muskellunge <em>Esox masquinongy</em> are stocked by the Ohio Department of Natural Resources, Division of Wildlife (ODNR-DOW) into nine reservoirs to create trophy fisheries. Escapement is recognized as a potential impediment to maintaining quality fisheries in these reservoirs. We evaluated the escapement of Muskellunge at four reservoirs using mark-recapture methods during 2013–2022. At each reservoir, all juvenile Muskellunge (254–305 mm) stocked during 2013–2018 were implanted with passive-integrated-transponder (PIT) tags prior to release. In addition, adult mark-recapture sampling events were conducted by the ODNR-DOW during 2019–2022 to check for tagged fish and implant untagged fish. Muskellunge anglers were also outfitted with handheld PIT readers to scan and report tagged fish during the study. Escapement was monitored continuously with PIT tag detection systems installed within dam spillways. We used multi-state (in-reservoir vs escaped) mark-recapture models to estimate annual escapement for juvenile (≤ age 1) and adult Muskellunge. A total of 51,826 fish were tagged (51,052 juveniles, 774 adults), resulting in 3428 detections (2316 individuals). The number of Muskellunge escaping varied widely among reservoirs (0–481). Most escapement (85 %) occurred during the spring (March–May). Nearly all (96 %) known age fish that escaped were age 3 or greater. Modelling revealed that annual probability of juvenile escapement (≤ 0.02) was likely inconsequential at all reservoirs. However, adult escapement was highly variable among reservoirs (mean = 0–0.34). Escapement was lowest at reservoirs where water levels are managed via offshore sluice-gate tower structures, and greatest at locations where surface water is discharged from along-shore structures (i.e., crest gates and unregulated spillway). Where escapement occurred, there was a negative relationship between the annual probability of escapement and fishing success. Results will be useful for informing stocking strategies, mitigating fish loss, and managing fishery expectations.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107230"},"PeriodicalIF":2.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744599","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":"Ecosystem-based fisheries management of crab fisheries in the Bering Sea and Aleutian Islands","authors":"Gordon H. Kruse ,&nbsp;Benjamin J. Daly ,&nbsp;Erin J. Fedewa ,&nbsp;Diana L. Stram ,&nbsp;Cody S. Szuwalski","doi":"10.1016/j.fishres.2024.107236","DOIUrl":"10.1016/j.fishres.2024.107236","url":null,"abstract":"<div><div>We review ecosystem-based fisheries management (EBFM) of crab fisheries in the Bering Sea and Aleutian Islands (BSAI) and discuss considerations for future EBFM efforts under a rapidly changing climate. Specifically, we review governance frameworks, ecosystem policy, fishery ecosystem plans, catch accounting systems, trawl bycatch controls, trawl area closures and habitat protections, gear modifications, a Crab Rationalization Program, Ecosystem and Economic Status Reports, and Ecosystem and Socioeconomic Profiles. The strongest EBFM features of this management system include mechanisms to avoid overfishing, use of scientific knowledge, consideration of ecosystem connections, appropriate monitoring, acknowledging uncertainty, stakeholder involvement, and decisions that reflect societal choice. Some EBFM principles, such as the efficacy of gear and area closures and accounting for the dynamic nature of ecosystems have room for improvement. In spite of the large number of EBFM measures in place, three of the eight BSAI crab stocks with biomass estimates were below their minimum stock size thresholds, and thus classified as “overfished” in 2023. The lack of apparent correspondence between implemented EBFM actions and crab stock trends may indicate that environmentally driven sporadic recruitment, spikes in natural mortality, and stock range shifts mute favorable responses to EBFM actions or that outstanding critical EBFM measures have yet to be addressed. In the face of recent large-scale changes in the marine ecosystems of the BSAI and an outlook for greater changes in the future, it is increasingly important to routinely reevaluate interactions between crab, their ecosystems, fisheries and fishing communities.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107236"},"PeriodicalIF":2.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757204","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":"Otolith stable isotopes highlight the importance of local nursery areas as the origin of recruits to yellowfin tuna (Thunnus albacares) fisheries in the western Indian Ocean","authors":"Iraide Artetxe-Arrate ,&nbsp;Igaratza Fraile ,&nbsp;Patricia Lastra-Luque ,&nbsp;Jessica Farley ,&nbsp;Naomi Clear ,&nbsp;Umair Shahid ,&nbsp;Shoaib Abdul Razzaque ,&nbsp;Mohamed Ahusan ,&nbsp;Annie Vidot ,&nbsp;Denham Parker ,&nbsp;Francis Marsac ,&nbsp;Hilario Murua ,&nbsp;Gorka Merino ,&nbsp;Iker Zudaire","doi":"10.1016/j.fishres.2024.107241","DOIUrl":"10.1016/j.fishres.2024.107241","url":null,"abstract":"<div><div>Yellowfin tuna (<em>Thunnus albacares</em>) supports the second largest tuna fishery worldwide, and in the Indian Ocean, it is overfished and subject to overfishing. This situation presents a significant challenge to fisheries management, requiring effective measures to rebuild and then maintain the stock at sustainable levels. A single stock of yellowfin is currently assumed by the Indian Ocean Tuna Commission (IOTC) for stock assessments in the Indian Ocean. However, the relative contribution of different spawning components to the total catches, and the degree of mixing rates of yellowfin tuna in the Indian Ocean by individuals from different production zones, are still unknown. This study uses otolith core oxygen and carbon stable isotope composition (δ¹⁸O and δ¹³C) of young-of-the-year yellowfin tuna from nursery areas located in the western (FAO Area 51) and eastern (FAO area 57) Indian Ocean, either side of 80 ºE, to establish a reference baseline of isotopic signatures. Then, a mixed population program (HISEA) and Random Forest (RF) assignment approaches were used to predict the most likely origin (west or east) of sub-adult and adult yellowfin tuna captured from four fishery areas of the western Indian Ocean (offshore Pakistan, Seychelles, Reunion, and South Africa) by comparing their otolith core values to that of the baseline. Both approaches show that the western Indian Ocean fisheries are mainly composed of west origin fish (&gt; 95 %). We also found some individuals with an otolith isotopic signature that was not characteristic of either of the samples available in the baseline. We simulated an alternative baseline group formed by individuals with mean and standard deviation δ¹³C and δ¹⁸O values above the maximum ranges of the original baseline. We then used RF to infer again the most likely origin of fish in the mixed sample considering 3 possible sources (west, east, alternative). About one third of the samples were assigned to the alternative group, possibly indicating that they differ in geographical or temporal terms with the origins represented in the original baseline. Findings of otolith stable isotope composition of yellowfin tuna in the western Indian Ocean can provide a more comprehensive understanding of the species’ spatial structure and connectivity beyond the current assumption of an ocean basin single stock.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107241"},"PeriodicalIF":2.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744597","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":"Cormorant predation in fyke net fishing: The direct effects of a protected bird on coastal commercial fishing","authors":"Mats Westerbom ,&nbsp;Camilla Ekblad ,&nbsp;Juhani Hopkins ,&nbsp;Toni Laaksonen ,&nbsp;Mikko Olin ,&nbsp;Antti Ovaskainen ,&nbsp;Veijo Jormalainen","doi":"10.1016/j.fishres.2024.107234","DOIUrl":"10.1016/j.fishres.2024.107234","url":null,"abstract":"<div><div>The population size of great cormorants, <em>Phalacrocorax carbo sinensis,</em> has risen steeply in the Baltic Sea over the past 40 years. The growing population has resulted in polarized conflicts between conservation and coastal fisheries due to the losses cormorants may inflict on fisheries. Mitigation of the conflicts requires objective estimates of true losses to fisheries, but quantitative research on losses has been scarce. We used continuous video-recordings to systematically quantify cormorant visits and their activity at 15 fyke nets during the 2022–2023 breeding and post breeding seasons. More than 2400 h of video footage were recorded, in which cormorants were found for 664 h. We also quantified the frequency of fish injured by birds in coastal fishing catches using data from the EU Fisheries Data Collection Program including data from fyke nets and gill nets. Our results show that cormorants frequently foraged in open, floating fyke nets but relatively rarely in submerged nets, leading to significantly higher losses in the former. Monitoring data from fyke and gill net catches covering the entire Finnish coast revealed that the proportion of bird-injured fish in catches is very modest (0.5 %) but can be considerable in individual catches. Finally, results indicate that cormorant visits and the proportion of injured fish in the catch tend to increase when distance to the nearest cormorant colony decreases. We conclude that the losses caused by birds are generally modest, except in open fyke nets where cormorants may conduct hundreds of dives and catch dozens of fish a day. Our study shows that cormorant depredation is highly variable in time and space, but also partly manageable by selecting gear that conforms to local cormorant pressures. We underline the importance of systematic scientific research when measuring damage caused by cormorants and ask for evidence-based political strategies to mitigate perceived cormorant problems.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107234"},"PeriodicalIF":2.2,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744595","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":"Current status of native crayfish populations in Russia: A brief review of their biology and fisheries","authors":"Alexander G. Dvoretsky,&nbsp;Vladimir G. Dvoretsky","doi":"10.1016/j.fishres.2024.107226","DOIUrl":"10.1016/j.fishres.2024.107226","url":null,"abstract":"<div><div>Historically, Russia has been a leader in the production of freshwater crayfish, with annual exports reaching 2000 t. However, the spread of crayfish plague led to a sharp decline in population densities in the 1970s. In this review, we provide an update on the current status of native crayfish populations in Russia, focusing on their biology and fisheries. The noble crayfish <em>Astacus astacus</em> primarily occur in the northwestern and central regions of Russia, whereas the narrow-clawed crayfish <em>Pontastacus</em> spp. are predominant in the Volga River basin and southern regions. The thick-clawed crayfish inhabits lagoons and estuaries in the Caspian Sea, Sea of Azov, and Black Sea. Between 2012 and 2015, annual catches fluctuated significantly. However, in the following four years, these figures stabilized, with a noticeable upward trend from 2020 onwards. A significant proportion of the total crayfish supply came from reservoirs, with an average contribution of 46 %. In addition, lakes, rivers, and other water bodies collectively contributed average share of 54 %. The Volgograd Reservoir, the Saratov Reservoir, water bodies along the left bank of the Volga River, and the Kuibyshev Reservoir are particularly important in terms of crayfish abundance and production accounting for 79 % of the total crayfish stock. The observed fluctuations in crayfish abundance are mainly due to environmental factors. The fisheries sector faces major challenges, including illegal fishing and habitat degradation.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107226"},"PeriodicalIF":2.2,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744623","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":"Otolith shape variability of labrid fish from Rapa Nui (Easter Island), southeastern Pacific","authors":"Andrés Castro-García ,&nbsp;Erwan Delrieu-Trottin ,&nbsp;Pablo Saenz-Agudelo ,&nbsp;Cristian Rapu-Edmunds ,&nbsp;Guido Plaza ,&nbsp;Federico Márquez ,&nbsp;Mauricio F. Landaeta","doi":"10.1016/j.fishres.2024.107233","DOIUrl":"10.1016/j.fishres.2024.107233","url":null,"abstract":"<div><div>Fish otolith shape provides valuable insights into fish species' taxonomic, phylogenetic, and ecological traits. This study aimed to assess and compare the phenotypic variation in otolith shape among four labrid species (<em>Anampses femininus</em>, <em>Coris debueni</em>, <em>Pseudolabrus fuentesi,</em> and <em>Thalassoma lutescens</em>) inhabiting Rapa Nui (Easter Island) in the southeastern Pacific Ocean, utilizing geometric morphometrics and aging methods. Age estimation based on otolith structure indicated that collected specimens were adults, ranging between 1 and 3 years old. Allometric analysis revealed low but significant variation (5.40 %), primarily driven by changes in otolith width, resulting in distinct morphologies. Principal Component Analysis (PCA) of sagittal otoliths elucidated significant morphospace variation among species, with the first two PCs explaining 60.3 % of the total variance. PC1 distinguished between elongated sagittal shapes (e.g., <em>P. fuentesi</em>) and robust sagittae (e.g., <em>T. lutescens</em>), while PC2 correlated with otolith roundness, delineating variations within species. Canonical variate analysis further highlighted differences in otolith shape, with significant variations detected among all species. The Discriminant function analysis showed high levels of discrimination accuracy for most of species’ pairs. Except for <em>C. debueni</em>-<em>P. fuentesi</em> (89 %) and <em>C. debueni</em>-<em>T. lutescens</em> (96 %), all other species pairs achieved 100 % discrimination, highlighting the reliability of otolith shape as a distinguishing characteristic for the studied species. Overall, our findings emphasize the value of otolith shape analysis for characterizing and distinguishing Rapa Nui labrid species. This offers potential applications such as identifying prey within the digestive systems of large fish or bird predators near this isolated island in the South Pacific Ocean or archaeofauna studies.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107233"},"PeriodicalIF":2.2,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744594","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}