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Factors sustaining the snail artisanal fishery in the San Matías Gulf, Patagonia, Argentina
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-02-01 DOI: 10.1016/j.fishres.2025.107282
María Soledad Avaca , Paula de la Barra , Ana Cinti , Maite Narvarte
{"title":"Factors sustaining the snail artisanal fishery in the San Matías Gulf, Patagonia, Argentina","authors":"María Soledad Avaca ,&nbsp;Paula de la Barra ,&nbsp;Ana Cinti ,&nbsp;Maite Narvarte","doi":"10.1016/j.fishres.2025.107282","DOIUrl":"10.1016/j.fishres.2025.107282","url":null,"abstract":"<div><div>In the San Matías Gulf, Argentina, artisanal fishers have adapted to declining stocks of traditional species by targeting alternative resources, such as the snail <em>Buccinastrum deforme</em>. This study investigates the sustainability of this artisanal diving fishery, emphasizing the role of informal rules and the socio-economic context of the fishers. We analyzed annual landings, fishing effort, and catch composition from 2000 to 2021 using mandatory landing reports and commercial data. Annual catches fluctuated, starting at 4 metric tons in 2000, peaking at 82 metric tons in 2011, and stabilizing at around 38 metric tons thereafter. Market demand, particularly from Asian markets between 2010 and 2016, influenced fishing dynamics, with a strong correlation between fishing effort and landings. Fishers exhibited adaptive strategies, alternating between mixed and non-mixed trips based on economic incentives. Analysis of size and sex composition of the catches revealed stable biological characteristics over time. Interviews with fishers revealed socio-economic challenges, including lack of health insurance, while highlighting the importance of fishing for household income. Informal management practices, such as selective harvesting and market-driven size preferences, have contributed to the stability of the fishery, although increased fishing effort raises concerns about sustainability. These findings provide valuable insights for the management of other small-scale fisheries facing similar challenges.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107282"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160841","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
Red snapper in the Gulf of Mexico: Can offshore populations export larval subsidies to nearshore fishing grounds?
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-02-01 DOI: 10.1016/j.fishres.2025.107271
Ana C. Vaz , Mandy Karnauskas , Kate Siegfried , Matthew W. Smith , LaTreese S. Denson , Christopher Gardner , John F. Walter III
{"title":"Red snapper in the Gulf of Mexico: Can offshore populations export larval subsidies to nearshore fishing grounds?","authors":"Ana C. Vaz ,&nbsp;Mandy Karnauskas ,&nbsp;Kate Siegfried ,&nbsp;Matthew W. Smith ,&nbsp;LaTreese S. Denson ,&nbsp;Christopher Gardner ,&nbsp;John F. Walter III","doi":"10.1016/j.fishres.2025.107271","DOIUrl":"10.1016/j.fishres.2025.107271","url":null,"abstract":"<div><div>The contribution of red snapper offshore populations to the replenishment of exploited areas in the Gulf of Mexico has been a source of debate and uncertainty in the management of this species for decades. Here, we investigate the spatial patterns of larval connectivity of red snapper in the Gulf, estimating source-sink dynamics and exploring how exploitation pressure can alter these patterns. Our results suggest that while the offshore cryptic biomass can contribute a large percentage of settlers to the Gulf, offshore biomass is unlikely to replenish highly exploited nearshore fishing grounds due to low likelihood of larval transport between offshore and nearshore habitats. Our results also indicate that high fishing pressure in nearshore areas, particularly by the recreational fishery, can change larval connectivity patterns. Taken together, our study provides insight into the complex interactions between heterogeneous fishing pressure and larval source-sink dynamics. Overall, this study highlights the importance of managing for localized depletion and balancing commercial and recreational fishing priorities. The findings emphasize the need for fine-scale spatial considerations in red snapper fishery management to address larval connectivity dynamics and mitigate the impact of exploitation.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107271"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161189","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
Diverse social and business networks shape the puerulus harvest industry along southern Indonesia
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-02-01 DOI: 10.1016/j.fishres.2024.107263
Anes Dwi Jayanti , Ingrid van Putten , Emily Ogier , Caleb Gardner
{"title":"Diverse social and business networks shape the puerulus harvest industry along southern Indonesia","authors":"Anes Dwi Jayanti ,&nbsp;Ingrid van Putten ,&nbsp;Emily Ogier ,&nbsp;Caleb Gardner","doi":"10.1016/j.fishres.2024.107263","DOIUrl":"10.1016/j.fishres.2024.107263","url":null,"abstract":"<div><div>Puerulus harvesting plays a crucial role in sustaining coastal communities in Indonesia. However, there is limited information available on the local socio-economic impact of this fishery. This study aims to gain a comprehensive understanding of this complex fishery system and the socio-economic variability within the puerulus fishery. The study examines the social dimensions by analysing connections among fishers and traders in diverse regions to identify trading variations and supply chain arrangements. Data from 75 puerulus fishers and 12 traders in Cisolok, Cilacap, Prigi, Popoh, and Lombok was collected through structured questionnaires, profiling livelihood conditions, operations, social networks, business arrangements, supply chains. The results highlight the significant impact of robust information sharing and agreements within local trade networks on the financial benefits generated through puerulus fishing for coastal fishers. Fishing and business arrangements are influenced by the characteristics of the local trade network, including geographic and economic resources. In summary, puerulus harvesting is important for coastal fishers, interconnected with trade relationships and networks. Transparency in information sharing through patron-client systems in puerulus fisheries is found to be a significant factor influencing the generation and distribution of benefits across different stakeholders in the supply chain.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107263"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160416","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
Making do with less: Extending an acoustic-based time series of euphausiid abundance using an uncrewed surface vehicle with fewer frequencies
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-02-01 DOI: 10.1016/j.fishres.2025.107270
Mike Levine, Alex De Robertis
{"title":"Making do with less: Extending an acoustic-based time series of euphausiid abundance using an uncrewed surface vehicle with fewer frequencies","authors":"Mike Levine,&nbsp;Alex De Robertis","doi":"10.1016/j.fishres.2025.107270","DOIUrl":"10.1016/j.fishres.2025.107270","url":null,"abstract":"<div><div>Survey time series are used to track species- and ecosystem-level trends over time to support ecosystem-based fishery management. However, these recurring survey efforts are subject to unpredictable cancellations and reductions in effort. This occurred in 2020 when the COVID-19 pandemic forced the cancellation of the research vessel-based 2020 eastern Bering Sea (EBS) acoustic-trawl survey, which has provided an estimate of euphausiid abundance and distribution since 2004. As a partial replacement for this lost effort, three uncrewed surface vehicles (USVs) were used to collect acoustic data. In contrast to the standard vessel-based survey, which provides 4-frequency acoustic data, the USVs collected acoustic data at only two frequencies. This presented a challenge given that four frequencies are currently used to identify euphausiids in this time series. Here, we first evaluated two methods to provide comparable euphausiid abundance estimates using fewer acoustic frequencies. We found that a random forest classifier was able to produce abundance estimates comparable to those obtained in the vessel-based time series. This method was then used to estimate euphausiid abundance and distribution from the 2020 USV survey. We additionally estimated the increase in survey uncertainty due to the use of the random forest classifier and changes in the acoustic instruments. Together, this allowed for the EBS euphausiid abundance time series to be extended with fewer acoustic frequencies.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107270"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161188","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
Interconnected partnerships: Mapping collaborations in Australian fisheries stock assessment
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-02-01 DOI: 10.1016/j.fishres.2025.107281
Ingrid van Putten , Catherine M. Dichmont , Natalie A. Dowling , Roy A. Deng , Sean Pascoe , André E. Punt
{"title":"Interconnected partnerships: Mapping collaborations in Australian fisheries stock assessment","authors":"Ingrid van Putten ,&nbsp;Catherine M. Dichmont ,&nbsp;Natalie A. Dowling ,&nbsp;Roy A. Deng ,&nbsp;Sean Pascoe ,&nbsp;André E. Punt","doi":"10.1016/j.fishres.2025.107281","DOIUrl":"10.1016/j.fishres.2025.107281","url":null,"abstract":"<div><div>Collaboration in science is important because it can lead to efficient knowledge exchange and grow scientific understanding. Examining the nature of co-authorship on reports and peer- reviewed papers can give insight into aspects of science collaboration. Here we examine the bibliographic networks of scientists who provide the scientific basis for Australian fisheries decision making using the methods of stock assessment. We focus on Australian stock assessments and determine co-author clustering around organisation, geolocation, and fished species. For the peer- reviewed literature there is evidence of clustering around a few individual authors characterised by their large number of publications and their relatively frequent first authorship. These stock assessment networks are vulnerable because knowledge exchange may be constrained by repeat collaboration with the same central co-authors who are mostly from the same organisation, leading to siloing. However, this does not mean the stock assessments are necessarily wrong. We also find that network connectedness is highly influenced by a few papers that have a higher-than-average number of co-authors, many of which involve “one-off” authors. This study highlights the need for increased and diversified collaboration, facilitation of interactions, and greater information sharing, among stock assessment scientists who provide the scientific basis for fisheries decision making. This needs to be balanced against the capacity of the available pool of stock assessment scientists.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"282 ","pages":"Article 107281"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161190","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
Otolith shape analysis as a tool for species identification and management of cryptic congeners in the northern Benguela ocean warming hotspot
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-01-01 DOI: 10.1016/j.fishres.2024.107262
M.R. Wilhelm , C.E. Jagger , N.M. Nghipangelwa , B.A. Pringle , P.W. Shaw , W.M. Potts , R. Henriques , N.J. McKeown
{"title":"Otolith shape analysis as a tool for species identification and management of cryptic congeners in the northern Benguela ocean warming hotspot","authors":"M.R. Wilhelm ,&nbsp;C.E. Jagger ,&nbsp;N.M. Nghipangelwa ,&nbsp;B.A. Pringle ,&nbsp;P.W. Shaw ,&nbsp;W.M. Potts ,&nbsp;R. Henriques ,&nbsp;N.J. McKeown","doi":"10.1016/j.fishres.2024.107262","DOIUrl":"10.1016/j.fishres.2024.107262","url":null,"abstract":"<div><div>Adaptive management is critical to maintaining resilient fisheries in our rapidly changing ocean environments. However, establishing appropriate and cost-effective monitoring programmes that adequately capture the responses of fisheries to climate change have been elusive. The coastal waters of central and northern Namibia are a global hotspot of ocean warming, with several responses by fish impacting its coastal fisheries. One documented change is a poleward distributional shift of the west coast dusky kob, <em>Argyrosomus coronus</em> into Namibia, where it has begun to hybridize with the congeneric <em>A. inodorus.</em> With considerably different life histories, it is critical that managers can differentiate between these species and the hybrids to appropriately manage the most important recreational and commercial linefish species (bycatch and biomass) in Namibia. In this paper, we used otolith shape analysis, Linear Discriminant Analyses (LDA) to show that otolith shape can be used to distinguish between species and their putative hybrids, identified based on mitochondrial DNA and nuclear microsatellite data. A total of 342 individuals from northern and central Namibia (northern Benguela) between 18.5 and 22.7°S were genetically identified, with a subsample of 217 paired with otolith shape analysis. Otolith shape analyses with LDA and leave-one-out cross validation showed successful species identification at 96.3 % accuracy, and improved accuracy of hybrid identification compared to using body morphology by 50 %. The Fourier descriptors provided excellent classification accuracy for separating <em>A. coronus</em> from <em>A. inodorus</em> (and putative hybrids, but poorer classification accuracy for separating the hybrids from <em>A. inodorus</em> (4/8). We thus recommend using otolith shape analysis for distinguishing the two species but suggest that genetic identification is still required to monitor hybridization. Monitoring for adaptive management should therefore include routine otolith collection and species classification to improve stock assessment and promote the development of appropriate management strategies for this important fishery in the northern Benguela.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107262"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133528","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
Biological traits and population dynamics for sustainable harvesting of Carcinus maenas
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-01-01 DOI: 10.1016/j.fishres.2024.107243
João N. Monteiro , Andreia Ovelheiro , Francisco Maia , Maria Alexandra Teodósio , Francisco Leitão
{"title":"Biological traits and population dynamics for sustainable harvesting of Carcinus maenas","authors":"João N. Monteiro ,&nbsp;Andreia Ovelheiro ,&nbsp;Francisco Maia ,&nbsp;Maria Alexandra Teodósio ,&nbsp;Francisco Leitão","doi":"10.1016/j.fishres.2024.107243","DOIUrl":"10.1016/j.fishres.2024.107243","url":null,"abstract":"<div><div>Research focusing on the biological patterns and population dynamics of <em>Carcinus maenas</em> has not been conducted for the purpose of fishery management along the European coastal systems. This has led to the implementation of fisheries management policies without scientific considerations, adversely affecting fishery profitability. To addrees this gap, we studied the crab species’ population dynamics, reproductive biology, and growth patterns across different Portuguese lagoons and estuaries on a monthly basis from 2019 to 2021. Surveys were performed in the Southern (Ria Formosa lagoon and Ria Alvor estuary), Central (Sado river/estuary) and Northern regions (Ria Aveiro estuary) of Portugal. Monthly biological data was used to analyse size-frequency distributions, sex ratios, spawning seasons, recruitment pulses, estimate carapace width at first maturaty and biological growth parameters. It was observed that spawning occurs almost year-round in all systems, with a peak in the colder months, between September and March. In the southern regions of the Portuguese coast, the spawning period starts earlier than in the central and northern systems, with a higher sex ratio recorded for females in all systems. The carapace width at which 50 % (CW<sub>50</sub>) of individuals reach maturity is similar for both sexes, around 30 mm, a value below to the minimum landing size enforced in Portugal. The analysis of von Bertalanffy growth curves revealed a continuous recruitment with a peak during the colder months, with individuals reaching the size at maturation after six months. The fast growth and continuous recruitment leds to the existence of between four and six growth cohorts for both sexes across all system. The findings of this study can contribute to more effective fisheries management policies for <em>C. maenas</em> in Portugal, such as a reduction of the minimum landing size.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107243"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133799","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
Assessment of mortality during trap and transport in adult European eel
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-01-01 DOI: 10.1016/j.fishres.2025.107264
Josefin Sundin, Konrad Karlsson, Birgitta Jacobson, Philip Jacobson
{"title":"Assessment of mortality during trap and transport in adult European eel","authors":"Josefin Sundin,&nbsp;Konrad Karlsson,&nbsp;Birgitta Jacobson,&nbsp;Philip Jacobson","doi":"10.1016/j.fishres.2025.107264","DOIUrl":"10.1016/j.fishres.2025.107264","url":null,"abstract":"<div><div>Many fluvial water systems suffer from reduced or completely disrupted connectivity due to human activities, causing negative effects for species and ecosystems. Artificial transport past migration barriers, so called trap and transport, can be used as a management tool to mitigate fish population declines. The efficiency of trap and transport is, however, rarely evaluated, in particular for downstream transport of catadromous species such as the European eel. In this study we analysed seven years of trap and transport data (2016–2022), encompassing nearly 58,000 transported adult eels, to evaluate mortality during all steps of the trap and transport process (i.e., mortality in fishing gear, during holding, and during transport). We found that mortality rates were generally low for all steps, 0.2–1.4 % in the fishing gear, 0.6–2 % during holding, and 0.03–0.17 % during transport (percent per year on average), compared to expected mortality in turbines (estimated turbine mortality in the investigated area: 70% to &gt;99 %). The factors affecting mortality differed across the trap and transport steps, with year, season (day of year), temperature, and mortality in the previous step (i.e., indicative of general stress in the previous step, and/or poor condition) being the factors having an effect. We conclude that trap and transport may cause relatively low mortality compared to turbines, but since it requires maintenance and human interference, restoration of connectivity should be the long-term goal.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107264"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133953","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
Modeling the spatial distribution and abundance of deep‐water red shrimps in the Mediterranean Sea: a machine learning approach
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-01-01 DOI: 10.1016/j.fishres.2024.107257
Elena Catucci , Diego Panzeri , Simone Libralato , Gianpiero Cossarini , Germana Garofalo , Irida Maina , Stefanos Kavadas , Federico Quattrocchi , Giulia Cipriano , Roberto Carlucci , Sergio Vitale , Chryssi Mytilineou , Fabio Fiorentino , Tommaso Russo
{"title":"Modeling the spatial distribution and abundance of deep‐water red shrimps in the Mediterranean Sea: a machine learning approach","authors":"Elena Catucci ,&nbsp;Diego Panzeri ,&nbsp;Simone Libralato ,&nbsp;Gianpiero Cossarini ,&nbsp;Germana Garofalo ,&nbsp;Irida Maina ,&nbsp;Stefanos Kavadas ,&nbsp;Federico Quattrocchi ,&nbsp;Giulia Cipriano ,&nbsp;Roberto Carlucci ,&nbsp;Sergio Vitale ,&nbsp;Chryssi Mytilineou ,&nbsp;Fabio Fiorentino ,&nbsp;Tommaso Russo","doi":"10.1016/j.fishres.2024.107257","DOIUrl":"10.1016/j.fishres.2024.107257","url":null,"abstract":"<div><div>Spatially-explicit models are invaluable tools for analyzing the species-environment interactions, even at scales beyond that of direct observations. In fisheries context, the observations on species usually consist of data derived from survey campaigns, such as the Mediterranean International Bottom Trawl Surveys (MEDITS) programme. MEDITS survey foresees the use of a standardized protocol for data acquisition on demersal species, such as the blue and red shrimp <em>Aristeus antennatus</em> and the giant red shrimp <em>Aristaeomorpha foliacea</em>. These two species are recognized as highly valuable marked resources accounting for about 5 % of the trawl fishing income in the Mediterranean basin. Here, we developed a modeling framework for the analysis of the MEDITS data on those species. Within our modeling framework we aimed at detecting the existence of a divergence in the spatial patterns that could guide the definition of targeted management actions for those two valuable fishing resources. A Random Forest (RF) machine learning approach has been used to model both the occurrence (i.e., presence/absence) and the biomass index (kg/km<sup>2</sup>) of both species in four Geographical SubAreas (GSAs) located in the central part of the Mediterranean and the Ionian Sea. The RF showed high level of accuracy (i.e., K=0.83 and K=0.88, for <em>A. antennatus</em> and <em>A. foliacea</em>, respectively) in modeling species occurrence, and good level of performance (i.e., R<sup>2</sup>=0.63 and R<sup>2</sup>=0.74, respectively) in modeling their biomass index (kg/km<sup>2</sup>). The niche overlap and statistical analyses we performed on the models outputs revealed the existence of a significant divergence in the spatial patterns between these species. This provides crucial ecological knowledge for the definition of targeted (i.e., species-related) management actions. Afterwards, the models have been extrapolated at the spatial scale of the Mediterranean Sea based on an approach we defined, called <em>hyperspace</em>. The <em>hyperspace</em> approach, while showing technical and ecological soundness, was meant to guarantee the reliability of model predictions in unknown areas. It reduces the need for a proper interpretation of “what is beyond a predicted value”, offering a straightforward method for model extrapolation. Our effort aims to provide insights for prioritizing key areas in conservation strategies and marine spatial planning. It also represents an important contribution towards adopting an ecosystem-based approach to fishery resource management in the Mediterranean basin.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107257"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133955","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
Influence of phospholipid and LC- PUFA content in extruded micro diets on European lobster larval (Homarus gammarus) performance and nutritional composition
IF 2.2 2区 农林科学
Fisheries Research Pub Date : 2025-01-01 DOI: 10.1016/j.fishres.2024.107255
Ivar Lund
{"title":"Influence of phospholipid and LC- PUFA content in extruded micro diets on European lobster larval (Homarus gammarus) performance and nutritional composition","authors":"Ivar Lund","doi":"10.1016/j.fishres.2024.107255","DOIUrl":"10.1016/j.fishres.2024.107255","url":null,"abstract":"<div><div>Requirement of lipids and long chain polyunsaturated fatty acids (LC PUFAs) on larval performance and development of European lobster is partly unknown. The effects of replacing live feed (<em>Artemia</em> nauplii) with two formulated extruded diets with different content of phospholipids and LC PUFAs were demonstrated for larval culture of European lobster <em>Homarus gammarus</em> obtained by supplementation of soy lecithin, salmon oil, krill oil and arachidonic acid (Croda) and fish oil (DHA 70). The isonitrogenous and isoenergetic diets; (low phospholipid; low PUFA), LPP and (high phospholipid high PUFA), HPP)had a phospholipid content of 3 % and 12 %- and a LC- PUFA content of 1 % and 4.8 %, respectively. Newly hatched larvae were distributed into triplicate conical transparent tanks of 46 L each with 250 larvae per tank. Two additional groups one fed with <em>Artemia</em> (AF type) and one group left unfed were used as controls. Temperature was 19.5 °C. Lobster larvae were fed twice daily for 18 days. Every three days, all larvae in each tank were counted and at 14 days post hatch 10 larvae per tank were sampled and subsequently frozen at −80°C for subsequent, fatty acid (FA) composition and lipid content. Survival and growth were significantly different between groups, lowest for unfed larvae and highest for <em>Artemia</em>. The highest number of stage IV post-larvae were obtained by <em>Artemia</em> followed by diets HPP and LPP, while only a few larvae survived in the unfed group until end of experiment. Lipid and FA composition in larvae were significantly related to dietary composition. Results showed, that although cannibalism persists as an over-riding factor in survival, appropriate dietary lipid composition is of importance in early larval stages and influence on survival and performance to post-larvae.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107255"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133956","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
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