Fisheries ResearchPub Date : 2025-05-19DOI: 10.1016/j.fishres.2025.107399
Noland O. Michels , Thomas R. Hrabik , Quinnlan C. Smith , Greg G. Sass , Allen F. Mensinger
{"title":"The effects of light intensity and water clarity on growth rates of age-0 walleye (Sander vitreus)","authors":"Noland O. Michels , Thomas R. Hrabik , Quinnlan C. Smith , Greg G. Sass , Allen F. Mensinger","doi":"10.1016/j.fishres.2025.107399","DOIUrl":"10.1016/j.fishres.2025.107399","url":null,"abstract":"<div><div>Growth rates in fish are a function of temperature and may also be dependent on successful foraging periods. Successful foraging of visually mediated piscivores is often contingent on available light. In north-temperate lakes, tannin concentrations can absorb downwelling light leading to lower light intensities which may influence fish foraging success and growth. We tested tannin and light intensity effects on wild age-0 walleye <em>Sander vitreus</em> growth, which may have implications for survivorship and recruitment. Age-0 walleye (127–182 mm TL) were held under three light intensities (3.16 × 10<sup>14</sup>, 3.16 × 10<sup>15</sup>, and 2.88 × 10<sup>17</sup> photons m<sup>−2</sup> s<sup>−1</sup>) and tannin concentrations (0 mg/L, 10 mg/L, and 20 mg/L). Walleye were grown at 18 °C for 16 days and TL (mm) and weight (g) were measured at days 0, 8, and 16. The number of fathead minnow (<em>Pimephales promelas</em>; 31–42 mm total length) consumed was recorded each day. Age-0 walleye growth was positive, ranging from 0.0092 g g<sup>−1</sup> day<sup>−1</sup> at 9.44 × 10<sup>15</sup> photons m<sup>−2</sup> s<sup>−1</sup> (∼750 lx surface intensity) in clear water to 0.0223 g g<sup>−1</sup> day<sup>−1</sup> at 1.58 × 10<sup>15</sup> photons m<sup>−2</sup> s<sup>−1</sup> (∼10 lx surface intensity) in heavily stained water. Growth was greatest in low light conditions and heavily stained waters. Our results suggest that heavily stained lakes and rivers with good optical refuge where light intensity is reduced at depth may be best for juvenile walleye growth.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"287 ","pages":"Article 107399"},"PeriodicalIF":2.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083721","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}
Fisheries ResearchPub Date : 2025-05-16DOI: 10.1016/j.fishres.2025.107403
Nicholas C. Wegner , Lyall Bellquist , Roberto Silva , John R. Hyde
{"title":"Juvenile and small adult cowcod (Sebastes levis) show high post-release survival following angling-induced barotrauma","authors":"Nicholas C. Wegner , Lyall Bellquist , Roberto Silva , John R. Hyde","doi":"10.1016/j.fishres.2025.107403","DOIUrl":"10.1016/j.fishres.2025.107403","url":null,"abstract":"<div><div>The cowcod, <em>Sebastes levis</em>, is a large slow-growing rockfish species found along the West Coast of the United States and Baja California, Mexico that has been historically heavily exploited off of southern California. As the cowcod population recovers from past overfishing, previously closed fishing areas and depths are reopening, leading to increased fisher interactions with the species, particularly juveniles and small adults, which are typically found at shallower depths closer to shore. In this study, we quantify post-release survival rates of juvenile and small adult cowcod (< 50 cm) following angling-induced barotrauma in comparison to previous work focused on larger adult cowcod. All cowcod were captured using recreational hook-and-line gear and descended back to depth using commercially available fish descending devices. Kaplan-Meier survivorship modeling showed an overall survival rate of 92.9 % (95 % CI: 80.3–100 %) for the 14 cowcod examined (22.9–49.5 cm fork length). This survival rate was nearly twice that determined previously for larger cowcod. The higher survival rate of smaller individuals may reflect their thinner tissues, allowing for expanding gas from the swim bladder to escape the body, thereby preventing some of the severe internal organ damage typically associated with barotrauma in larger cowcod. Combination of our results with previous research thus suggests that small cowcod caught by recreational anglers can be released with high survival rates, while larger cowcod are less likely to survive capture and barotrauma.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"287 ","pages":"Article 107403"},"PeriodicalIF":2.2,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068106","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}
Fisheries ResearchPub Date : 2025-05-16DOI: 10.1016/j.fishres.2025.107400
Holly Gunton , Ashley M. Fowler , David J. Booth , John Stewart
{"title":"Patterns and drivers of movement in the estuary-associated sparid Acanthopagrus australis from a large-scale tagging study","authors":"Holly Gunton , Ashley M. Fowler , David J. Booth , John Stewart","doi":"10.1016/j.fishres.2025.107400","DOIUrl":"10.1016/j.fishres.2025.107400","url":null,"abstract":"<div><div>Knowledge of fish movement is essential for implementing appropriate spatial scales of stock assessment and management. This study examines the movement patterns of an important fisheries species <em>Acanthopagrus australis</em>, yellowfin bream, along Australia’s east coast using data from a cooperative tag-recapture program. More than 24, 000 individuals were tagged and released across ∼ 800 km of coastline, with recreational anglers recapturing 2, 036 (8.2 %) individuals during a 19-year period. While a broad range of movements was observed (0–832 km), only 8.6 % of fish moved further than 100 km and a substantial proportion (37 %) of individuals were recaptured at their release location. Generalized additive models indicated that fish were more likely to move if they spent greater time at liberty, were of larger body length at release, and were released during Autumn. Movement distance was greater if fish moved in a northerly direction, spent greater time at liberty and were released at more southerly latitudes. The results indicate that movement of yellowfin bream is restricted over a relatively small spatial scale (< 100 km), with occasional larger movements consistent with multiple behavioural types. The findings suggest that monitoring, assessment and management at a finer spatial scale than the current state-wide approach may be warranted to ensure sustainable fisheries management.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"287 ","pages":"Article 107400"},"PeriodicalIF":2.2,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070783","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}
Fisheries ResearchPub Date : 2025-05-15DOI: 10.1016/j.fishres.2025.107406
Chengbin Zhang , Ying Xiong , Dade Song , Hushun Zhang , Shuyan Wang , Zhongjie Kang , Long Liang
{"title":"Analysis of the fishing intensity and management status of Anguilla japonica fry in the north coast of the Yangtze River Estuary- based on BeiDou VMS data and licenses data","authors":"Chengbin Zhang , Ying Xiong , Dade Song , Hushun Zhang , Shuyan Wang , Zhongjie Kang , Long Liang","doi":"10.1016/j.fishres.2025.107406","DOIUrl":"10.1016/j.fishres.2025.107406","url":null,"abstract":"<div><div>The Japanese eel (<em>Anguilla japonica</em>) is one of the Red List of Threatened Species as an “endangered” species in the International Union for Conservation of Nature (IUCN). This study focused on analysing the fishing characteristics of fishing vessels targeting Japanese eel fry (glass eels) within Chinese waters and examining current management practices for this species. We analyzed the fishing behavior of 497 vessels along the north coast of the Yangtze River Estuary using data from the BeiDou Vessel Monitoring System (VMS). Key study insights included the following. (1) The correspondence between vessels' actual fishing range and licensed-designated fishing zones was approximately 48.6 %. (2) The observed fleets mainly fell into two operational categories: Single-vessel (a single vessel fishing independently, SV), representing 15.1 % of the fleets, and Primary-secondary-vessel (where a primary-vessel carries one to three secondary-vessels to the fishing area, anchors, and releases the secondary-vessels to fish independently, PSV), representing 84.9 %. (3) For SVs, fishing areas are categorised into one, two, and more than three areas. (4) Fishing areas varied by vessel size: vessels under 12 m primarily operated in offshore waters at 0–20 m depths, and those over 24 m operated in deeper offshore waters at depths of 20–40 m. In comparison, vessels between 12 and 24 m were located in intermediate areas. (5) Fishing intensity varied significantly across regions, with the highest concentration observed in coastal waters at 0–20 m depth off Rudong waters and Dongtai waters, where fishing density reached 13–18 vessels/100 km<sup>2</sup>. (6) Since the implementation of the Yangtze River Estuary Fishing Ban Zone in 2021, the core fishing grounds of eel fry fishing has shifted from the Haimen at the Yangtze River Estuary to the Rudong and the Dongtai sea waters. Based on the aforementioned research outcomes, the following recommendations are proposed: 1) For PSVs, fishery management authorities should mandate the standardised installation of BeiDou VMS on secondary-vessels. 2) It is advisable to enact regulations stipulating the permissible quantity of fishing nets carried by vessels based on their specifications.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"287 ","pages":"Article 107406"},"PeriodicalIF":2.2,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947741","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}
Fisheries ResearchPub Date : 2025-05-15DOI: 10.1016/j.fishres.2025.107397
Maria del Mar Gil , José María Disdier-Gómez , Gaetano Catanese , Silvia de Juan , Hilmar Hinz
{"title":"Static nets in motion: Evaluating seabed interactions of trammel nets deployed in two Mediterranean artisanal fisheries","authors":"Maria del Mar Gil , José María Disdier-Gómez , Gaetano Catanese , Silvia de Juan , Hilmar Hinz","doi":"10.1016/j.fishres.2025.107397","DOIUrl":"10.1016/j.fishres.2025.107397","url":null,"abstract":"<div><div>Static fishing gears, such as trammel nets, are traditionally considered to have minor physical impact on benthic habitats and communities. However, some studies suggest notable but poorly quantified interactions with the seabed. This fact can be especially concerning when fishing occurs over complex and sensitive habitats, as is the case of fisheries targeting spiny lobster (<em>Palinurus elephas</em>) in the Mediterranean. Understanding these interactions is crucial for assessing ecological impacts and promoting sustainable practices in small-scale fisheries. This study evaluated the interaction of the trammel nets targeting cuttlefish (<em>Sepia officinalis</em>) and spiny lobster with the seagrass <em>Posidonia oceanica</em> and rhodolith bed (i.e., formed by nodules of coralline red algae) habitats, respectively, using underwater time-lapse cameras, motion sensors, GPS, and catch data. The results confirmed that nets remained static during the soaking, but caused considerable displacement and collapse over the seabed during hauling. These processes increased the contact surface, leading to organism displacement and entanglement. Interaction area between nets and seabed significantly increased with the depth and net length; however, shorter nets generated larger interaction areas when standardized by netting walls. Entanglement of <em>P. oceanica</em> in cuttlefish fishing increased with interaction area, while no such pattern was observed for rhodoliths in lobster fishing, likely due to habitat heterogeneity. The acquired knowledge in this study about the interactions between trammel nets and sensitive benthic habitats facilitates the assessment of fishing impacts and the development of mitigation measures in conservation-focused areas.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"287 ","pages":"Article 107397"},"PeriodicalIF":2.2,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947742","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}
Fisheries ResearchPub Date : 2025-05-13DOI: 10.1016/j.fishres.2025.107388
Muriel Dunn , Geir Pedersen , Malin Daase , Jørgen Berge , Emily Venables , Sünnje L. Basedow , Stig Falk-Petersen , Tom J. Langbehn , Jenny Jensen , Lionel Camus , Maxime Geoffroy
{"title":"Broadband acoustic classification of Atlantic cod, polar cod, and northern shrimp in in situ mesocosm experiments","authors":"Muriel Dunn , Geir Pedersen , Malin Daase , Jørgen Berge , Emily Venables , Sünnje L. Basedow , Stig Falk-Petersen , Tom J. Langbehn , Jenny Jensen , Lionel Camus , Maxime Geoffroy","doi":"10.1016/j.fishres.2025.107388","DOIUrl":"10.1016/j.fishres.2025.107388","url":null,"abstract":"<div><div>The northern shrimp (<em>Pandalus borealis</em>) and the Atlantic cod (<em>Gadus morhua</em>) fisheries are prone to bycatch of polar cod (<em>Boreogadus saida</em>), a key Arctic forage fish species. Discrimination between the acoustic signals from these coinciding species could provide information on the risk of bycatch in addition to improving the accuracy of non-lethal scientific stock assessment surveys. As a step towards automatic <em>in situ</em> classification, we conducted a series of single-species mesocosm experiments for broadband target strength spectra measurements of Atlantic cod, polar cod and northern shrimp. Mesocosm experiments were completed with a Wideband Autonomous Transceiver (WBAT) and collected individual target strength spectra, TS(<em>f</em>), between 90–170 kHz and 185–255 kHz. Hundreds of TS(<em>f</em>) were extracted for each species and used to train machine-learning classification algorithms (i.e. classifiers). We found that two supervised learning classifiers, LightGBM and support vector machine, were able to achieve high classification performance (89%) on target spectra shape with a single 200 kHz transducer operating in broadband mode. This is promising for acoustic classification from autonomous platforms with limited payload. We explore the utilization of single transducer target spectra shape variability and provide recommendations to overcome challenges associated with scaling the method successfully for <em>in situ</em> marine species classification not only in the Arctic, but globally.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"286 ","pages":"Article 107388"},"PeriodicalIF":2.2,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942121","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}
Fisheries ResearchPub Date : 2025-05-12DOI: 10.1016/j.fishres.2025.107401
Matheus L.S. Silva , Humber A. Andrade , Jason M. Cope , Thierry Frédou , Andrey P.C. Soares , Thaiza M.R.R. Barreto , Flávia L. Frédou
{"title":"Length reconstructions as an alternative approach to data-limited fisheries","authors":"Matheus L.S. Silva , Humber A. Andrade , Jason M. Cope , Thierry Frédou , Andrey P.C. Soares , Thaiza M.R.R. Barreto , Flávia L. Frédou","doi":"10.1016/j.fishres.2025.107401","DOIUrl":"10.1016/j.fishres.2025.107401","url":null,"abstract":"<div><div>Real-length catch compositions are crucial for effective fisheries management, providing essential information on stock status and reference points. However, these datasets can be biased due to various factors, leading to unreliable fluctuations in mean lengths over time and potentially inaccurate representations of population length compositions. To address these challenges, a modeling approach was developed to account for the effects of fishing pressure and temperature, while also considering temporal, spatial, and gear-related fluctuations to reconstruct mean length trends. Subsequently, a distribution simulation method was applied to replicate length distributions. This methodology was applied to small tunas in Brazil, revealing a decreasing trend in mean lengths for the majority of species, with reductions of up to 26 % observed in certain cases. Comparative analysis with traditional population simulation methods showed minimal statistical differences, underscoring the effectiveness of our distribution simulation approach. Thus, our method of reconstructing mean length trends and simulating distributions offers a practical solution for managing scenarios with limited size data by correcting length trends over time and improving the availability of length distributions with minimal parameter requirements.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"286 ","pages":"Article 107401"},"PeriodicalIF":2.2,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936874","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}
Fisheries ResearchPub Date : 2025-05-09DOI: 10.1016/j.fishres.2025.107398
Yue Wang , Xiaoming Yang , Jiangfeng Zhu
{"title":"Exploring spatiotemporal non-stationarity of the marine environmental impact on skipjack fishery under different climate conditions in the Western and Central Pacific","authors":"Yue Wang , Xiaoming Yang , Jiangfeng Zhu","doi":"10.1016/j.fishres.2025.107398","DOIUrl":"10.1016/j.fishres.2025.107398","url":null,"abstract":"<div><div>The skipjack tuna (<em>Katsuwonus pelamis</em>) is a significant fishery resource within purse seine fisheries in the Western and Central Pacific Ocean. The distribution of skipjack resources is influenced by the El Niño-Southern Oscillation (ENSO), exhibiting diverse spatiotemporal impact mechanisms. To investigate the spatiotemporal non-stationarity of how marine environments affect skipjack catch rate under different climate conditions, we applied the geographically and temporally weighted regression (GTWR) model to skipjack catch rate and marine environmental data from 2004 to 2021. We then compared GTWR with geographically weighted regression and generalized additive models to evaluate its validity. The findings reveal: (1) The GTWR model significantly outperformed the other two models, achieving an adjusted R² of 0.63 and exhibiting lower MAE, RMSE, and RSS values, which demonstrates the presence of spatiotemporal non-stationarity. (2) Skipjack catch rate was significantly affected by sea surface salinity and temperature (SSS, SST) as well as net primary production (NPP). Sea level anomaly (SLA) and mixed layer depth (MLD) had a moderate impact, whereas zonal and meridional current velocities (U55, V55) had a relatively minor influence. (3) The impact of environmental factors displayed varying spatial non-stationarity. Spatial non-stationarity was most pronounced for NPP, SSS, and V55, followed by SLA and SST, and least pronounced for MLD and U55. Notably, SLA spatial non-stationarity decreased during normal periods, U55 increased during El Niño, and MLD and V55 increased during La Niña. (4) Due to spatial differences influenced by ENSO, the eastern study area displayed more significant temporal non-stationarity than the western area.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"286 ","pages":"Article 107398"},"PeriodicalIF":2.2,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927772","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":"Early life-stage and adult productivity dynamics derived from a state-space stock assessment model for data-limited Thorny Skates (Amblyraja radiata Donovan, 1808) in NAFO Divisions 3LNO and Subdivision 3Ps","authors":"N.G. Cadigan , R.W. Steele , S.J.W.W.M.M.P. Weerasekera , M.R. Simpson","doi":"10.1016/j.fishres.2025.107396","DOIUrl":"10.1016/j.fishres.2025.107396","url":null,"abstract":"<div><div>Thorny skate fisheries in the Northwest Atlantic are of heightened management interest because of the vulnerability of the species to fishing and their severe declines in the Gulf of St. Lawrence down to the Gulf of Maine. North of these regions in NAFO Divisions 3LNO and Subdivision 3Ps, thorny skate are the most abundant skate species and there has been directed fishing for this stock since the 1980’s. However, there is no stock assessment model to evaluate the impacts of fishery catches or to provide future catch advice to fisheries managers. We present a state-space stock assessment model which integrates length-based survey indices and total fishery catch information to estimate population dynamics, including changes in natural mortality rates. However, this is a data limited stock so our assessment model makes simplifying assumptions which we test with sensitivity analyses. We also conduct simulation analyses of the model. These results indicate that the model estimates are robust to assumptions and reliable in simulations, although we found some bias which should be acknowledged and better understood if the model is used for management advice. Our model indicates that the stock declined rapidly between 1986 and 1995 but increased since then and in 2019 the SSB was about half of the average value in 1984–1986 prior to the decline.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"286 ","pages":"Article 107396"},"PeriodicalIF":2.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918092","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}