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A typology of recreational sea anglers in England and Wales
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-04-09 DOI: 10.1016/j.fishres.2025.107364
Adam Fisher , Julie Urquhart , Kieran Hyder
{"title":"A typology of recreational sea anglers in England and Wales","authors":"Adam Fisher ,&nbsp;Julie Urquhart ,&nbsp;Kieran Hyder","doi":"10.1016/j.fishres.2025.107364","DOIUrl":"10.1016/j.fishres.2025.107364","url":null,"abstract":"<div><div>Understanding diversity among anglers is a key aspect of effective fishery management. Typologies are coherent models best describing heterogeneity in populations and have been used extensively to understand sea angler responses to management and policy. Typologies can also aid the assessment of bias in non-probabilistic sampling, as part of recreational sea angling monitoring, through the inclusion of metrics beyond those based on days fished, location and gear. There is no standard approach to the formation of typologies and, historically, the UK has lacked a suitable description of recreational sea angler diversity to inform both sector monitoring and the development of fishery policy post-Brexit. This study developed and employed a wide-ranging data collection framework to form the first ever typology of recreational sea anglers in England and Wales. The typology is based on principal component and cluster analysis of 472 angler survey questionnaires, follow-up interviews, and was validated using a unique qualitative verification method. Variance was represented by ten components reflecting variable groupings across the data collection framework. Drawing on the components and several independent validating variables, the typology comprised: consumers; trophy anglers; leisure-identity anglers; and social anglers. Value-based and attitudinal metrics performed better than behavioural variables. Domains of angler ‘involvement’ showed strong performance as markers of variance in the sample. Specialisation variables proved less useful as summary indices that reflected sample variance. Methodological suggestions are provided for integrating the typology in future monitoring assessments in addition to applied examples of how the typology informs the implementation of management measures.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"285 ","pages":"Article 107364"},"PeriodicalIF":2.2,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799319","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}
引用次数: 0
Interannual variations in the size structure of swordtip squid Uroteuthis edulis in the southern East China Sea
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-04-08 DOI: 10.1016/j.fishres.2025.107361
Tzu-Yun Ching, Chih-Shin Chen
{"title":"Interannual variations in the size structure of swordtip squid Uroteuthis edulis in the southern East China Sea","authors":"Tzu-Yun Ching,&nbsp;Chih-Shin Chen","doi":"10.1016/j.fishres.2025.107361","DOIUrl":"10.1016/j.fishres.2025.107361","url":null,"abstract":"<div><div>Identifying the population structure of commercially exploited fish species is essential for effective fisheries management. These insights are particularly important for short-lived squid, which often exhibit considerable variations in life history traits. The swordtip squid (<em>Uroteuthis edulis</em>) inhabits temperate and tropical neritic waters of the Indo-Pacific regions, and is harvested using diverse fishing gears and methods throughout its distribution range. Two seasonal cohort of swordtip squid on the southern East China Sea (ECS) shelf have been identified, each exhibit distinct growth patterns. However, information on the size structures of the seasonal cohorts on the southern ECS shelf remains limited. In this study, we examine the size groups and associated life history traits of swordtip squid in the southern ECS during 2021–2022. Swordtip squid were categorized into large-sized (LS) and small-sized (SS) groups based on natural breaks in the distribution of mantle length for each sex at each sexual maturity stage. The LS group hatched in winter and matured (spawned) in spring-summer, whereas the SS group hatched in summer and matured (spawned) in autumn-winter. The two size groups likely alternated between generations. Notably, some individuals hatched in the same season but developed into different size groups, suggesting the possibility of exposure to varying environmental conditions. These results imply the spawning sites for swordtip squid are widespread in the southern ECS, likely driven by major oceanographic processes that vary seasonally and interannually. Our findings clarify the population structure of swordtip squid on the southern ECS shelf and may facilitate conservation and management measures for the fisheries in the Northwest Pacific region.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"285 ","pages":"Article 107361"},"PeriodicalIF":2.2,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792074","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}
引用次数: 0
Socio-economic status and occupational mobility of China’s Fishery Population: A quantitative analysis based on social-survey data
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-04-06 DOI: 10.1016/j.fishres.2025.107362
Yi Huang , Ulf Dieckmann , Mikko Heino
{"title":"Socio-economic status and occupational mobility of China’s Fishery Population: A quantitative analysis based on social-survey data","authors":"Yi Huang ,&nbsp;Ulf Dieckmann ,&nbsp;Mikko Heino","doi":"10.1016/j.fishres.2025.107362","DOIUrl":"10.1016/j.fishres.2025.107362","url":null,"abstract":"<div><div>China ranks as the first fishery nation globally in terms of its fishery production, with a total production of more than 67 million metric tons in 2022. More than 16 million people work in and earn their livelihoods from fisheries, directly or indirectly. A better understanding of the characteristics of this large group of people could lead to an improved appreciation of the human dimensions of China’s fisheries. In this study, we analyze longitudinal social-survey data from 1989 to 2015 to derive several key indicators representing the socio-economic status of China’s fishery population. We find that, first, the size of the fishery population is shrinking. Second, the average age of the fishery population is increasing but at a slower rate than in the total population. Third, the education levels of the fishery population are rising but remain below those of urban residents. Fourth, the incomes of the fishery population have grown considerably, albeit more slowly than those of the general rural population and the urban population. Fifth, the employment of the fishery population is exhibiting a high degree of dynamism, with high rates of occupational mobility between the fishing sector and other sectors.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"285 ","pages":"Article 107362"},"PeriodicalIF":2.2,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783656","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}
引用次数: 0
Evaluating the metabolic response to temperature using otolith carbon isotopes as an intrinsic metabolic tracer in juvenile chum salmon Oncorhynchus keta
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-04-05 DOI: 10.1016/j.fishres.2025.107360
Yuxiao Gou , Shiono Miki , Yuki Iino , Takaaki K. Abe , Ryuji Hattori , Ming-Tsung Chung , Kotaro Shirai , Takashi Kitagawa
{"title":"Evaluating the metabolic response to temperature using otolith carbon isotopes as an intrinsic metabolic tracer in juvenile chum salmon Oncorhynchus keta","authors":"Yuxiao Gou ,&nbsp;Shiono Miki ,&nbsp;Yuki Iino ,&nbsp;Takaaki K. Abe ,&nbsp;Ryuji Hattori ,&nbsp;Ming-Tsung Chung ,&nbsp;Kotaro Shirai ,&nbsp;Takashi Kitagawa","doi":"10.1016/j.fishres.2025.107360","DOIUrl":"10.1016/j.fishres.2025.107360","url":null,"abstract":"<div><div>The carbon isotopic compositions of otolith can be used to retrospectively estimate fish field metabolic rates (FMR) and are advantageous for practical applications, particularly for small-sized fish whose metabolic rates are challenging to measure in the field. Based on the proportional contribution of metabolism-derived carbon to otolith carbon, this study validated an approach for juveniles of the anadromous fish species, chum salmon <em>Oncorhynchus keta</em>, by integrating respirometry experiments and stable isotope ratio mass spectrometry (SIA). The isotopic results showed that the compositions of otolith carbon isotope (<em>δ</em><sup>13</sup>C<sub><em>otolith</em></sub>) values were negatively correlated with body mass, aligning with the mass-specific allometric theory. The ratio of metabolism-derived carbon in otoliths (<em>C</em><sub>resp</sub>) was calculated based on the carbon isotope compositions of the otolith, dissolved inorganic carbon in water (DIC), and diet. The results indicated that up to nearly 50 % of the carbon in juvenile chum salmon otoliths was metabolism-origin. Further, temperature gradient experiments showed that the <em>C</em><sub>resp</sub> values increased until around a temperature of 15℃ and fell significantly at 20℃, suggesting that the factorial FMR was restricted at temperatures exceeding the optimal temperature for metabolism (<em>T</em><sub>opt</sub>). Thus, the relationship between metabolic rate and <em>C</em><sub>resp</sub> was validated within the temperature range of 9–15℃. Nonetheless, as a cool-water species, wild chum salmon rarely experience water masses above 15℃. Therefore, our results were feasible to estimate the FMR of juvenile chum salmon in the wild and could be used for reconstructing their metabolic histories, thereby providing insights into the metabolic strategies associated with migration traits.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"285 ","pages":"Article 107360"},"PeriodicalIF":2.2,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783657","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}
引用次数: 0
Shrinking shrimp - Investigating the weight loss of northern shrimp Pandalus borealis following boiling
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-04-05 DOI: 10.1016/j.fishres.2025.107356
Christopher A. Griffiths, Emilia Björklund, Nuno Prista, Axel Hjelm, Katja Norén, Lisa Sörman, Ronja Risberg, Massimiliano Cardinale, Mikaela Bergenius Nord
{"title":"Shrinking shrimp - Investigating the weight loss of northern shrimp Pandalus borealis following boiling","authors":"Christopher A. Griffiths,&nbsp;Emilia Björklund,&nbsp;Nuno Prista,&nbsp;Axel Hjelm,&nbsp;Katja Norén,&nbsp;Lisa Sörman,&nbsp;Ronja Risberg,&nbsp;Massimiliano Cardinale,&nbsp;Mikaela Bergenius Nord","doi":"10.1016/j.fishres.2025.107356","DOIUrl":"10.1016/j.fishres.2025.107356","url":null,"abstract":"<div><div>Reported landings from commercial fisheries are a main source of information on the removed biomass of a species and/or stock from the sea. In many fisheries, however, on-board processing to meet market demand causes a discrepancy between the landed weight and original live weight, necessitating the use of correction factors during data preparation for stock assessment and advice. One such fishery is for northern shrimp (<em>Pandalus borealis)</em> in the Skagerrak, Kattegat and northern North Sea. In this fishery, large, often female shrimp are boiled in salt water while on-board to maximise sale prices and scientists currently use a correction factor of 1.13 to account for the weight loss of shrimp from boiling. Here, we investigated this correction factor by conducting a weight loss experiment on-board the Swedish shrimp fishery between 2022 and 2024. We estimate that shrimps lose 10.26 % of their weight during boiling which corresponds to a correction factor of 1.11. Further, we find that weight loss likely varies on a seasonal basis, with more weight being lost during Q2 and Q3 compared to Q1 and Q4, potentially due to changes in the biology of the species as well as environmental conditions. Our findings suggest that the current correction factor used in the assessment of the stock should be reduced for the Swedish fishery and should preferably vary based on when the shrimp are caught. The experimental methodology used here could also be used to estimate weight loss in other shrimp fisheries.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"285 ","pages":"Article 107356"},"PeriodicalIF":2.2,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777090","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}
引用次数: 0
Condition assessment and best-practice handling guidelines for skate (Rajiformes) bycatch: Lessons from demersal longline fisheries in the Southern Indian Ocean
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-04-05 DOI: 10.1016/j.fishres.2025.107357
Johanna Faure , Clara Péron , Rob Jones , Michael Grima , Colette Appert , Nicolas Gasco , Timothy Lamb , Philippe Ziegler , Jaimie Cleeland
{"title":"Condition assessment and best-practice handling guidelines for skate (Rajiformes) bycatch: Lessons from demersal longline fisheries in the Southern Indian Ocean","authors":"Johanna Faure ,&nbsp;Clara Péron ,&nbsp;Rob Jones ,&nbsp;Michael Grima ,&nbsp;Colette Appert ,&nbsp;Nicolas Gasco ,&nbsp;Timothy Lamb ,&nbsp;Philippe Ziegler ,&nbsp;Jaimie Cleeland","doi":"10.1016/j.fishres.2025.107357","DOIUrl":"10.1016/j.fishres.2025.107357","url":null,"abstract":"<div><div>Elasmobranchs, including sharks, skates and rays, are often characterised by low reproductive rates, rendering their populations susceptible to declines in abundance caused by elevated mortality rates. While skates are occasionally targeted by commercial fisheries, they are commonly caught as incidental bycatch in demersal fisheries. The release of captured individuals that are still alive is often used as a management measure to prevent declines in skate populations. Upon capture, a visual assessment of skate physical condition is necessary to avoid discarding of dead or badly injured individuals. Good handling practices are also required to promote post-release survival. Our study investigated skate handling practices and the condition assessment method of Patagonian toothfish longline fisheries operating in the Southern Indian Ocean. A total of 171 longline captured skates were photographed, and the images analysed by specialist veterinarians trained in elasmobranch health to characterise injuries and qualitatively predict the physical and physiological consequences of each injury type on skate post-release survival. We found 13 types of injury, 10 of which were attributed to the capture process. Among these injuries, two were deemed irreversible, prompting a recommendation to retain the individual at all times. The majority of the examined injuries ranged from superficial to severe, particularly in cases of mouth/jaw damage. Based on these results, we developed best-practice handling guidelines and condition assessments, in form of posters and a comprehensive video tutorial. They provide clear guidance for managers and longline fishing crew for addressing 1) the condition of individuals that should be retained or released at sea alive and 2) handling practices to minimise further injury prior to the release. The guidelines for handling practices and condition assessments developed here can also be easily adapted to manage skate bycatch in other longline fisheries.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"285 ","pages":"Article 107357"},"PeriodicalIF":2.2,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777092","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}
引用次数: 0
Global sensitivity and uncertainty analyses of an ecosystem model for simulating food web dynamics in the Cooperation Sea, Southern Ocean
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-04-05 DOI: 10.1016/j.fishres.2025.107345
Lei Xing , Arnaud Grüss , Nicolas Barrier , Jianfeng He , Jianye Tang
{"title":"Global sensitivity and uncertainty analyses of an ecosystem model for simulating food web dynamics in the Cooperation Sea, Southern Ocean","authors":"Lei Xing ,&nbsp;Arnaud Grüss ,&nbsp;Nicolas Barrier ,&nbsp;Jianfeng He ,&nbsp;Jianye Tang","doi":"10.1016/j.fishres.2025.107345","DOIUrl":"10.1016/j.fishres.2025.107345","url":null,"abstract":"<div><div>There is growing interest in developing and using ecosystem simulation models to advise fisheries management in the Southern Ocean. However, poor understanding of the impacts of uncertainty in ecosystem model parameters slows down progress towards operational ecosystem models. To address this issue, we explored uncertainty in the parameters estimated during the calibration of an OSMOSE ecosystem model for the Cooperation Sea (“OSMOSE-CooperationSea”) and the impacts of this uncertainty. Our investigations pertained to four types of calibrated parameters: (1) <em>Plank.access</em>, the proportion of the biomass of background species groups available to focal species groups; (2) <em>Bio</em><sub><em>flux</em></sub>, the parameter controlling the flux of migratory species group biomasses across the modelled domain boundaries; (3) <em>M</em><sub><em>larval</em></sub>, the instantaneous larval mortality of the focal species groups; and (4) <em>M</em><sub><em>natural</em></sub>, the additional natural mortality of the focal species groups. Results with the Morris method suggested that the community in the Cooperation Sea was most sensitive to changes in the <em>M</em><sub><em>larval</em></sub> parameter of mesopelagic fishes. The biomasses of large-size, long-lived species such as toothfishes, Adélie penguin (<em>Pygoscelis adeliae</em>), seals, and whales were most sensitive to the parameters specific to these species groups. By contrast, the biomasses of small-sized, short-lived species such as mesopelagic fishes and krill species were most sensitive to changes in the parameters specific to the predators of these species groups. Monte Carlo simulations indicated that community dynamics were more sensitive to the <em>M</em><sub><em>larval</em></sub> and <em>M</em><sub><em>natural</em></sub> parameters than to the <em>Plank.access</em> and <em>Bio</em><sub><em>flux</em></sub> parameters. After gradually increasing the <em>M</em><sub><em>larval</em></sub> or <em>M</em><sub><em>natural</em></sub> parameter, the biomasses of Adélie penguin, seals and whales decreased, while the biomasses of mesopelagic fishes and Antarctic krill increased. By providing a comprehensive analysis of uncertainty in the parameters estimated during the calibration process, the present study represents an important step towards an operational ecosystem model for supporting ecosystem-based management in the Cooperation Sea. The present study will serve as a valuable basis for similar ecosystem modelling efforts in the Southern Ocean.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"285 ","pages":"Article 107345"},"PeriodicalIF":2.2,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777093","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}
引用次数: 0
Interactions and spatiotemporal variations in the life history attributes of a non-native species in the upper Paraná River and its native congener
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-04-04 DOI: 10.1016/j.fishres.2025.107359
Élida Jeronimo Gouveia , Diego Corrêa Alves , Miguel Petrere Jr. , Angelo Antonio Agostinho
{"title":"Interactions and spatiotemporal variations in the life history attributes of a non-native species in the upper Paraná River and its native congener","authors":"Élida Jeronimo Gouveia ,&nbsp;Diego Corrêa Alves ,&nbsp;Miguel Petrere Jr. ,&nbsp;Angelo Antonio Agostinho","doi":"10.1016/j.fishres.2025.107359","DOIUrl":"10.1016/j.fishres.2025.107359","url":null,"abstract":"<div><div>The introduction of species has negative effects on biodiversity and ecosystem functioning, with these impacts typically mediated by interspecific relationships. This study aimed to assess intraspecific and interspecific interactions, the effect of flood duration on the abundance of the congeners <em>Megaleporinus piavussu</em> (native) and <em>M. macrocephalus</em> (non-native), as well as variations in life-history traits across temporal scale for native species (pre- and post-invasion) and spatial scale for the non-native species (original and invaded environment). We tested the interaction effects between both species in population dynamics models. In contrast, life-history traits estimates for both species were obtained using length-frequency. The significant intraspecific competition coefficient suggests a negative impact on the annual per capita growth rate of both species. Only the native species population exhibited a significant interspecific competition coefficient. Flood duration positively affected the growth rate of both species, with more pronounced effects on the population of <em>M. piavussu</em>. During coexistence periods of the species (post-invasion period and invaded environments), a higher mean condition factor, female dominance, asymptotic length, longevity, and total mortality, including fishing mortality, were registered. On the other hand, the pre-invasion period for <em>M. piavussu</em> and the original environment for <em>M. macrocephalus</em> showed numerically lower values for life-history traits. Our findings suggest that the impact of the interspecific competition coefficient may be more pronounced for native species than for non-native species. Furthermore, the life history attributes of these species varied between the evaluated periods and locations in response to environmental conditions and food resource availability.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"285 ","pages":"Article 107359"},"PeriodicalIF":2.2,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768253","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}
引用次数: 0
Post-collapse somatic growth and population recovery failure of sardine (Sardinops sagax) in the northern Benguela from otolith biochronologies
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-04-02 DOI: 10.1016/j.fishres.2025.107352
Faye R.V. Brinkman , Szymon Smoliński , Heino O. Fock , Mohammad Hadi Bordbar , Anja Kreiner , Moses S. Kalola , Margit R. Wilhelm
{"title":"Post-collapse somatic growth and population recovery failure of sardine (Sardinops sagax) in the northern Benguela from otolith biochronologies","authors":"Faye R.V. Brinkman ,&nbsp;Szymon Smoliński ,&nbsp;Heino O. Fock ,&nbsp;Mohammad Hadi Bordbar ,&nbsp;Anja Kreiner ,&nbsp;Moses S. Kalola ,&nbsp;Margit R. Wilhelm","doi":"10.1016/j.fishres.2025.107352","DOIUrl":"10.1016/j.fishres.2025.107352","url":null,"abstract":"<div><div>The sardine (<em>Sardinops sagax)</em> population in northern Benguela, Namibia, supported high catches in the 1950s-1960s and collapsed by the late 1960s. Despite a fishing moratorium since 2018, the population has shown no signs of recovery by 2023. In this study, a 48-year (1974–2021) biochronology was developed using archived sardine otoliths. Otolith increment widths, used as a proxy for annual fish growth, were analysed using linear mixed effects models to explore intrinsic (within individual) and extrinsic (sardine biomass, sea surface temperature and upwelling) factors contributing to annual variations in fish growth. The absence of otolith data from before the population collapse in the late 1960s meant that the analysis of predicted annual sardine otolith growth post-collapse showed short-term fluctuations but no significant long-term growth rate changes. Predicted annual sardine growth was significantly negatively linked with SST in Austral spring, and positively linked with upwelling in summer for the area 17–20 ºS (northern Namibia). The results suggest environmental conditions play a dominant role in driving sardine growth, exacerbated by the extremely low sardine biomass, which may be indicative of depensation. The study provides insight on the reasons behind the lack of recovery in sardine biomass. Therefore, otolith biochronologies provides a broader understanding of how small pelagic fish stocks respond to environmental changes.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"285 ","pages":"Article 107352"},"PeriodicalIF":2.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747645","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}
引用次数: 0
Overview of the Ecosystem-Based Fisheries Management (EBFM) workshop at the International Conference on lobster and crab fisheries in 2023
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-04-02 DOI: 10.1016/j.fishres.2025.107354
Nick Caputi , Simon de Lestang , Rick Fletcher , Michael Fogarty , Gretta Pecl , Jason How
{"title":"Overview of the Ecosystem-Based Fisheries Management (EBFM) workshop at the International Conference on lobster and crab fisheries in 2023","authors":"Nick Caputi ,&nbsp;Simon de Lestang ,&nbsp;Rick Fletcher ,&nbsp;Michael Fogarty ,&nbsp;Gretta Pecl ,&nbsp;Jason How","doi":"10.1016/j.fishres.2025.107354","DOIUrl":"10.1016/j.fishres.2025.107354","url":null,"abstract":"<div><div>While the need for ecosystem-based fisheries management (EBFM) has been long recognised, the escalating demands and serious threats that climate change poses to our marine ecosystems and the industries and human societies that depend on them, have increased the urgency for its adoption. Given this importance, EBFM was the overarching theme of the 5-day International Lobster and Crab conference held during October 2023 in Western Australia which included a special EBFM workshop that examined the following five concepts: species sustainability, ecosystem sustainability, economic outcomes, social amenity and social impacts. The workshop presentations covered the breadth of EBFM issues including the ecosystem effects of fishing, social, economic, environmental impacts and climate change, bycatch, governance issues in addition to the management of targeted lobster and crab stocks. The major outcomes and conclusions for fisheries management policy identified during the workshop included: (a) the need to take a ‘whole-of-resource’ approach rather than focusing on the effect of a particular fishery; (b) explicit recognition of socio-economic objectives in harvest strategies; (c) incorporating climate change within fisheries management systems; (d) assessment of stationarity assumptions in biological parameters; (e) recognising that regime shifts can result in major shifts in abundance and distribution of stocks; (f) importance of proper governance and compliance in fisheries management; (g) minimising fisheries interactions with protected species; (h) importance of long-term fishery-independent surveys for target species and ecosystem issues; (i) recovery of lost fishing gear; (j) recognition of spatial processes in the management of fisheries and the formation of marine protected areas; (k) importance of considering traditional knowledge alongside western science in fisheries assessment and management; and (l) acknowledging the need for ecosystem-based management which also takes into account the non-fisheries sectors competing for the same spatial area of the resource.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"285 ","pages":"Article 107354"},"PeriodicalIF":2.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747656","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}
引用次数: 0
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