Aquatic Living Resources最新文献

{"title":"New codend designs to improve the size selectivity of fyke net for narrow-clawed crayfish (Pontastacus leptodactylus)","authors":"Verena Trenkel (Handling Editor),&nbsp;Mehmet Cilbiz ,&nbsp;Celalettin Aydın ,&nbsp;Bent Herrmann","doi":"10.1051/alr/2022014","DOIUrl":"10.1051/alr/2022014","url":null,"abstract":"<div><div>The narrow-clawed crayfish (<em>Pontastacus leptodactylus</em>) is one of the most ecologically and economically important freshwater species in Turkey. However, the harvest of this species has declined from 7937 t in 1984 to 696 t in 2019. One of primary reasons for this decrease in stock is the use of fishing gears with poor size selectivity. In this study, new codend designs were investigated to improve the size selectivity of fyke nets for <em>P. leptodactylus</em>. Seven codends of three different designs were tested: (1) a commercially used standard codend with 34 mm mesh size (<em>Com34</em>); (2) sorting grids with 20 (<em>SG20</em>), 25 (<em>SG25</em>) and 30 mm (<em>SG30</em>) bar spacing attached to the last circle of the net; and (3) a stiff rigged net, the last part of the fyke nets (codend) with 34 (<em>SRN34</em>), 42 (<em>SRN42</em>) and 50 mm (<em>SRN50</em>) mesh size. The average length at 50% retention probability (<em>L</em>₅₀) and selection range (<em>SR</em>) (<em>L</em>₇₅–<em>L</em>₂₅) values of <em>Com34</em> were 9.4 cm and 3.1 cm, respectively. For the <em>SG20</em>, <em>SG25</em> and <em>SG30</em> grids, the <em>L</em>₅₀ values were 11.3 cm, 11.6 cm and 12.0 cm, while the <em>SR</em> values were 1.4 cm, 1.3 cm and 0.6 cm, respectively. For the <em>SRN34</em>, <em>SRN42</em> and <em>SRN50</em> codends, the <em>L</em>₅₀ values were 10.9 cm, 11.6 cm and 11.6 cm, while the <em>SR</em> values were 2.1 cm, 2.1cm and 1.1 cm, respectively. Overall, the commercial codend resulted in lower <em>L</em>₅₀ values when the minimum conservation reference length of 10 cm was considered. However, all tested new codend designs showed improved selectivity compared with the standard, with optimum results obtained with <em>SG20</em>. <em>SG20</em> grid decreased discarding by 15.7% compared to the classic commercial fyke net; thus, this is a very important result for the sustainability of natural <em>P. leptodactylus</em> stocks.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"35 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Metazoan parasite community as a potential biological indicator in juveniles of the starry smooth-hound Mustelus asterias Cloquet, 1819 (Carcharhiniformes Triakidae)","authors":"Claudia Gérard ,&nbsp;Maxime R. Hervé ,&nbsp;Héloïse Hamel ,&nbsp;Mélanie Gay ,&nbsp;Michel Barbier ,&nbsp;Thomas Barreau ,&nbsp;Ryan Carnegie","doi":"10.1051/alr/2022002","DOIUrl":"10.1051/alr/2022002","url":null,"abstract":"<div><div>The starry smooth-hound <em>Mustelus asterias</em> is a near-threatened coastal shark in Europe, whose parasitofauna is largely unknown. We studied metazoan parasites of 20 immature sharks (13 males and seven females) from the English Channel and we examined their relationships with host condition and their use as host bioindicators. All the sharks were parasitized by one to six metazoan taxa among the twelve recorded in the whole sampling (one trematode, six cestodes and two nematodes trophically-transmitted; one monogenean, one copepod and one myxosporean on gills), with a mean abundance of 30.5 ± 21.4 parasites per fish (myxosporeans not included). The three major taxa were in decreasing order: the nematode <em>Acanthocheilus rotundatus</em> (prevalence: 75%, Confidence Interval 53–89%), the cestode <em>Eutetrarhynchus</em> sp. (70%, CI 48–85%), and the monogenean <em>Erpocotyle laevis</em> (60%, CI 39–78%). The gill copepod <em>Kroyeria lineata</em> and the gut nematode <em>Proleptus obtusus</em> were identified as significant pathogens. Parasite community differed between males and females despite their immature stage, suggesting early spatial sex-segregation, with <em>E. laevis</em>, <em>Eutetrarhynchus</em> sp. and <em>Anthobothrium</em> sp. proposed as tags. We discuss results in terms of host fitness loss and information given by parasites on diet ecology and stock discrimination. We recommend incorporating parasitology in further research to improve shark conservation and management.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"35 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Interacting climate change effects on mussels (Mytilus edulis and M. galloprovincialis) and oysters (Crassostrea gigas and Ostrea edulis): experiments for bivalve individual growth models","authors":"Pauline Kamermans ,&nbsp;Camille Saurel ,&nbsp;Pierre Boudry","doi":"10.1051/alr/2022001","DOIUrl":"10.1051/alr/2022001","url":null,"abstract":"<div><div>The physiological response of two species of mussels (<em>Mytilus edulis</em> and <em>M. galloprovincialis</em>) and two species of oysters (<em>Crassostrea gigas</em> and <em>Ostrea edulis</em>) to temperature, oxygen levels and food concentration, factors likely to vary as a result of climate change, was determined experimentally. Bivalves of similar size from different origins were exposed to six temperatures (3, 8, 15, 20, 25 and 30 °C) at two food regimes (2 and 10 μg Chl a L⁻¹) for 6 weeks. In a parallel running experiment <em>M. edulis</em> from the same batches were exposed to three different temperatures (15, 20 and 25 °C) and three different oxygen levels (30, 50 and 100%) at two food regimes (2 and &gt;8 μg Chl <em>a</em> L⁻¹) for 3–4 weeks. Survival during the experiment ranged from 93% to 100% except for the mussels exposed to 30 °C which showed 100% mortality after three to 32 days. Higher food conditions showed higher optimal temperatures for growth of mussels and oysters. In addition, at the high food treatment, reduced O₂ saturation resulted in lower growth of mussels. At the low food treatment there were no differences in growth among the different O₂ levels at the same temperature. At high food concentration treatment, <em>M. edulis</em> growth was higher with low temperature and high oxygen level. Condition index was higher at higher food concentrations and decreased with increasing temperature. In addition, condition was lower at low oxygen saturation. Lower clearance rates were observed at high food concentrations. At 100% saturation of oxygen, mussel clearance rate increased with temperature at High food regime, but not at Low food regime. Mussel clearance rates were significantly reduced with low oxygen concentrations together with high temperature. Oxygen consumption significantly increased with temperature. Oxygen saturation was the main factor affecting mussel clearance rate. High temperature and low oxygen concentration combined significantly reduced clearance rate and increased oxygen consumption. These response curves can be used to improve parameterisation of individual shellfish growth models taking into consideration factors in the context of climate change: temperature, food concentration, oxygen concentration and their interactions. The observation that abiotic factors interact in affecting mussels and oysters is an important result to take into account.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"35 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Molecular identification, life cycle characterization, and hatchery seed production of dwarf oysters from the Ebro Delta (Spain)","authors":"Patricia Prado ,&nbsp;Margarita Fernández ,&nbsp;David Cordero ,&nbsp;Carlos Saavedra ,&nbsp;Francesca Carella ,&nbsp;Carles Alcaraz ,&nbsp;Ignasi Gairin ,&nbsp;Pauline Kamermans","doi":"10.1051/alr/2022005","DOIUrl":"10.1051/alr/2022005","url":null,"abstract":"<div><div>Dwarf oysters in the Ebro Delta are only observed growing on local pen shells, <em>Pinna nobilis</em> L., currently under extinction risk. The species identification of these populations is uncertain, given recent genetic classifications of dwarf oysters of <em>Ostrea stentina</em> species complex. Hence, the first objective of this study was to confirm the identity of dwarf oysters associated to <em>P. nobilis</em> in the Ebro Delta. Then, we aimed to assess the viability of hatchery and nursery production of <em>O. stentina</em> for potential conservation programs using diets based on a mix of live microalgae species or the commercial Shellfish Diet 1800^®. Our results showed that COI sequences obtained were specific to <em>O. stentina</em>. Significant differences in the growth and survival of larvae between diet treatments were observed in 3 days. For the live diet, the larval period lasted from 15 to 22 days (299.2 ± 4 µm) whereas it took up to 36 days using the Shellfish Diet 1800^® (280 ± 7.2 µm), with an overall mortality of 72.3 vs. 99.3%, respectively for each diet. Besides, no seed survival was observed for the commercial diet after a 10-day-fixation attempt. In contrast, ca. 16% of the individuals on the live diet that were allowed to settle reached the juvenile stage and could be released to the environment. Histological examination of obtained seed did not present any sign of disease and showed gonadal development for both sexes at ca. 6 months of age (16.1–19.1 mm). The growth curve obtained was fitted to a Schnute-Richards growth model which returned ages of up to 10 years for maximum local sizes of 45 mm. We conclude that although the Shellfish Diet 1800^® is not an adequate diet for <em>O. stentina</em>, its hatchery production is feasible and might provide support to future conservation actions.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"35 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143331936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Lactic acid bacteria as probiotics in sustainable development of aquaculture","authors":"Antonio Figueras,&nbsp;Anna Chizhayeva ,&nbsp;Alma Amangeldi ,&nbsp;Yelena Oleinikova ,&nbsp;Aigul Alybaeva ,&nbsp;Amankeldy Sadanov","doi":"10.1051/alr/2022011","DOIUrl":"10.1051/alr/2022011","url":null,"abstract":"<div><div>Industrial aquaculture is a dynamic area capable of solving problems of healthy nutrition and food security. Increase of organic pollution, number of opportunistic microorganisms in the aquatic environment of fish farms and the global contamination of feed by mycotoxigenic fungi are serious problems of industrial fish cultivation. The results are weakening of the general condition of fish, immunosuppression, the occurrence of various diseases complicated by drug resistance, the accumulation of antibiotics and chemical compounds in tissues. Probiotics can be an alternative to antibiotics. The use of probiotics is also one of the biological methods for maintaining and restoring the normal physiological state of fish and increasing their productivity. The aim of this review is the scientific justification of the use of lactic acid bacteria as the safest microorganisms in the development of probiotics for aquaculture. The review presented provides criteria for selecting candidate strains for effective probiotics development. The advantages of lactic acid bacteria for the prevention or control of infectious diseases in cultured fish are considered. Lactic acid bacteria are representatives of the fish microbiota, they have antagonistic activity against opportunistic pathogens, fungi and viruses that cause microbiological spoilage of feed, pollute water bodies, and cause diseases of aquatic animals. The review provides information on various researches in which lactic acid bacteria or products derived from them have been used to assess their potential in aquaculture. Numerous scientific studies prove the value of this vast group of microorganisms for the prevention and treatment of fish diseases, for increasing the resistance of aquatic animals to infectious diseases and various stresses, for improving their survival and productivity, and for improving water sanitation in fish reservoirs. Increased use of effective probiotic lactic acid bacteria in aquaculture can make the fish sector safer, more productive and friendly to the environment and human well-being, and will contribute to the sustainable development of aquaculture.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"35 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Age, growth and maturity of frigate tuna (Auxis thazard Lacepède, 1800) in the Southeastern Brazilian coast","authors":"Flavia Lucena Fredou,&nbsp;Juliana M.S. Vieira ,&nbsp;Paulo A.S. Costa ,&nbsp;Adriana C. Braga ,&nbsp;Ricardo R.B. São-Clemente ,&nbsp;Carlos E.L. Ferreira ,&nbsp;Jodir P. Silva","doi":"10.1051/alr/2022010","DOIUrl":"10.1051/alr/2022010","url":null,"abstract":"<div><div>Age, growth and maturity of frigate tuna (<em>Auxis thazard</em>) were studied for the first time in Southeast Brazil. A total of 650 fish (265–494 mm Fork Length) were sampled from beach-seine landings between March 2018 and February 2019. Sectioned fin spines from 548 specimens were processed and age was determined by counting and measuring of increments. Growth parameters were fitted to length-at-age data using the von Bertalanffy growth function and were compared to the literature using the growth performance index (Phi). Macro and microscopic characterization of gonads and physiological indexes were used for the analysis of the reproductive cycle. The length distribution did not differ by sex. Assigned ages were between 0+ and 4 years, with annual increments formed during winter. Coefficient of variation between readings was 11%. Growth differed by sex, and the von Bertalanffy growth parameters were <em>L</em>_∞ = 471 mm; <em>k</em> = 0.47 year⁻¹; and <em>t</em>₀ = –1.46 year⁻¹ for females; <em>L</em>_∞ = 498 mm; <em>k</em> = 0.35 year⁻¹; and <em>t</em>₀ = –2.01 year⁻¹ for males. Phi was 5.0 for both sexes. Estimated growth rate is among the lowest recorded for the species, possibly related to the method used for age and growth assessment. Gonadosomatic index peaked in December, associated with the upwelling of the South Atlantic Central Waters, at a temperature of approximately 16 °C. Spawning activity in colder waters has never been reported for this species and may be influenced by a richer habitat caused by the intrusion of more nutritive rich waters during spring-summer, which allows larval development. Length-at-first-maturity (<em>L</em>₅₀) was 345.4 mm for females and 329.8 mm for males.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"35 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Correction Notice: Age, growth and maturity of frigate tuna (Auxis thazard Lacepède, 1800) in the Southeastern Brazilian coast","authors":"Juliana M.S. Vieira ,&nbsp;Paulo A.S. Costa ,&nbsp;Adriana C. Braga ,&nbsp;Ricardo R.B. São-Clemente ,&nbsp;Carlos E.L. Ferreira ,&nbsp;Jodir P. Silva","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"35 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143331949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Direct multiplex PCR-NALFIA to inform marine conservation: Use of an innovative diagnostic tool for the detection of Ostrea edulis larvae","authors":"Andreas Benkens ,&nbsp;Claudia Buchholz ,&nbsp;Bernadette Pogoda ,&nbsp;Carsten Georg Harms ,&nbsp;Carlos Saavedra","doi":"10.1051/alr/2021023","DOIUrl":"10.1051/alr/2021023","url":null,"abstract":"<div><div>The European oyster <em>Ostrea edulis</em> played a key role in the North Sea by providing several ecosystem functions and services. Today, <em>O. edulis</em> is classified as severely degraded or functionally extinct in Europe. Marine conservation is focusing on biogenic reef restoration, namely the restoration of <em>O. edulis</em> in Natura 2000 sites of the North Sea. The identification of oyster larvae related to natural spatfalls of restored reefs and monitoring of larval drift is a key aspect of marine protected area management. Morphological identification and distinction from other abundant bivalve larvae using microscopy is difficult. Existing molecular biological methods are expensive and bound to stationary laboratory equipment, or are inadequate in the visualization. In this study, we identified nucleic acid lateral flow immunoassay (NALFIA), a well-established tool in human pathogen diagnostics, as an efficient approach for point-of-care (POC) testing in marine monitoring. Based on the genetic sequence of the mitochondrial cytochrome b of <em>O. edulis</em>, forward and reverse primers were developed. The reverse primer was labelled with fluorescent dye FITC, forward primer with biotin. Reaction on the lateral flow stripe could be realized with a single <em>O. edulis</em> larva in direct PCR with multiplex primers in a portable PCR-cycler. The established NALFIA system can distinguish <em>O. edulis</em> larvae from <em>Crassostrea gigas</em> and <em>Mytilus edulis</em> larvae, respectively. This method offers new approaches in POC testing in marine research and monitoring. It gives quick and clear results, is inexpensive, and could be easily adapted to other species of interest.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Histology of Tritia mutabilis gonads: using reproductive biology to support sustainable fishery management","authors":"Alicia Mallet ,&nbsp;Jean-Yves Jouvenel ,&nbsp;Morgane Broyon ,&nbsp;Nelly Pirot ,&nbsp;Benjamin Geffroy ,&nbsp;Ellen Kenchington","doi":"10.1051/alr/2021006","DOIUrl":"10.1051/alr/2021006","url":null,"abstract":"<div><div>The mutable nassa, <em>Tritia mutabilis,</em> a marine gastropod that is widely exploited on the Adriatic coast is an important source of income for small-scale fishermen in the Mediterranean Sea, particularly in the Gulf of Lion. However, the lack of knowledge on the ecology and biology of this species limits our capacities to propose and produce an effective management plan. As a result, stocks are currently declining, especially in Italy. In order to optimize a management plan for this fishery, we designed a study to better characterize the reproductive biology of <em>T. mutabilis</em>, using gonad histology and performing a regular monitoring of population size frequency. The average shell height of individuals during the breeding period was 24 ± 2.7 mm for males and 30 ± 3.7 mm for females. The presence of small females (10 mm) and large males (32 mm) in the whole sample challenged previous assumptions regarding protandry (sex change from male to female). The size at first maturity was estimated for males and females at 17.5 mm and 24.4 mm shell height, respectively. In Italy, current management measures include a minimum conservation reference size of 20 mm in shell height. Therefore, it is likely that many individuals that did not reproduce are being caught, which could partly explain the decline observed, despite conservation measures introduced more than ten years ago. Overall, our study provides some baseline information to establish, in consultation with fishermen, management measures for this small-scale fishery in France.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Do efficient small-scale fishers stay active in eras of introducing individual transferable quotas? Evidence from Denmark","authors":"Ayoe Hoff ,&nbsp;Max Nielsen ,&nbsp;Rasmus Nielsen ,&nbsp;Satoshi Yamazaki","doi":"10.1051/alr/2021014","DOIUrl":"10.1051/alr/2021014","url":null,"abstract":"<div><div>Theory suggests the use of individual transferable quotas (ITQs) as a solution to overcapacity and to keep efficient fishers active. While the reduction of overcapacity under ITQ implementation is well documented, empirical evidence on the role of capacity utilisation in adjusting the labour force is scarce. This article analyses whether the capacity utilisation of the vessels that fishers own/work on influences their probability of continuing fishing or whether factors such as fishing income and pension are more important. Danish small-scale fisheries with vessels less than 17 m in length, in which ITQs were introduced in 2007, are studied using a multinomial logit regression based on a unique dataset of individual income and socioeconomic characteristics of Danish fishers in the period 2002-2012 as well as individual vessel data. Together with other relevant socioeconomic variables, vessel capacity utilisation is included in the regression. The latter is identified in a productivity analysis of all commercial active vessels using Data Envelopment Analysis. It is found that increasing vessel capacity utilisation both significantly and positively influences the decision to stay in a small-scale fishery. Increasing income from fisheries also significantly influences the probability of staying in the fishery business. The Danish results provide evidence that the most efficient fishers are those who remain active when ITQs are implemented.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}