Guillermo Boyra , Jon Uranga , Nicolas Goñi , Iann Godard , Bea Sobradillo
{"title":"从比斯开湾的活饵渔船上测量大西洋蓝鳍金枪鱼(Thunnus thynnus)的目标强度","authors":"Guillermo Boyra , Jon Uranga , Nicolas Goñi , Iann Godard , Bea Sobradillo","doi":"10.1016/j.fishres.2024.107150","DOIUrl":null,"url":null,"abstract":"<div><p>Despite its significant economic importance and intensive exploitation worldwide, the Atlantic bluefin tuna (ABFT) lacks the essential parameters required to estimate its abundance using acoustic methods at the most used 38 kHz frequency. This paper presents <em>in situ</em> measurements of target strength (TS; dB re 1 m<sup>2</sup>) for ABFT in dorsal aspect obtained from a baitboat in the Bay of Biscay, using a 38-kHz split-beam echosounder. A linear regression model was fit between TS and fork length (FL; cm) based on data from nine live-bait fishing operations. To mitigate potential bias due to double counting, TS measurements were filtered with fish tracking. The range of modal TS values per set was from −38 to −17 dB for modal tuna body fork lengths between 55 and 150 cm, that is, a rather thorough range of sizes including ABFT juveniles and adults. The linear regression resulted in a TS-length relationship characterised by a slope of 36.9 dB and an intercept of −101.6 dB, with a coefficient of determination R<sup>2</sup> = 87 %. When the slope of the TS-length relationship was forced to 20, the intercept (<em>b</em><sub><em>20</em></sub>) was −68.5 dB (R<sup>2</sup> = 79.5 %). The acoustic parameters presented in this work are key to providing an alternative to the uncertainties associated with the traditionally used fishery-dependent abundance indices of ABFT in the Bay of Biscay and abroad.</p></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"280 ","pages":"Article 107150"},"PeriodicalIF":2.2000,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Target strength measurements of Atlantic bluefin tuna (Thunnus thynnus) from a live-bait fishing vessel in the Bay of Biscay\",\"authors\":\"Guillermo Boyra , Jon Uranga , Nicolas Goñi , Iann Godard , Bea Sobradillo\",\"doi\":\"10.1016/j.fishres.2024.107150\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Despite its significant economic importance and intensive exploitation worldwide, the Atlantic bluefin tuna (ABFT) lacks the essential parameters required to estimate its abundance using acoustic methods at the most used 38 kHz frequency. This paper presents <em>in situ</em> measurements of target strength (TS; dB re 1 m<sup>2</sup>) for ABFT in dorsal aspect obtained from a baitboat in the Bay of Biscay, using a 38-kHz split-beam echosounder. A linear regression model was fit between TS and fork length (FL; cm) based on data from nine live-bait fishing operations. To mitigate potential bias due to double counting, TS measurements were filtered with fish tracking. The range of modal TS values per set was from −38 to −17 dB for modal tuna body fork lengths between 55 and 150 cm, that is, a rather thorough range of sizes including ABFT juveniles and adults. The linear regression resulted in a TS-length relationship characterised by a slope of 36.9 dB and an intercept of −101.6 dB, with a coefficient of determination R<sup>2</sup> = 87 %. When the slope of the TS-length relationship was forced to 20, the intercept (<em>b</em><sub><em>20</em></sub>) was −68.5 dB (R<sup>2</sup> = 79.5 %). The acoustic parameters presented in this work are key to providing an alternative to the uncertainties associated with the traditionally used fishery-dependent abundance indices of ABFT in the Bay of Biscay and abroad.</p></div>\",\"PeriodicalId\":50443,\"journal\":{\"name\":\"Fisheries Research\",\"volume\":\"280 \",\"pages\":\"Article 107150\"},\"PeriodicalIF\":2.2000,\"publicationDate\":\"2024-09-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Fisheries Research\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0165783624002145\",\"RegionNum\":2,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"FISHERIES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fisheries Research","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0165783624002145","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"FISHERIES","Score":null,"Total":0}
Target strength measurements of Atlantic bluefin tuna (Thunnus thynnus) from a live-bait fishing vessel in the Bay of Biscay
Despite its significant economic importance and intensive exploitation worldwide, the Atlantic bluefin tuna (ABFT) lacks the essential parameters required to estimate its abundance using acoustic methods at the most used 38 kHz frequency. This paper presents in situ measurements of target strength (TS; dB re 1 m2) for ABFT in dorsal aspect obtained from a baitboat in the Bay of Biscay, using a 38-kHz split-beam echosounder. A linear regression model was fit between TS and fork length (FL; cm) based on data from nine live-bait fishing operations. To mitigate potential bias due to double counting, TS measurements were filtered with fish tracking. The range of modal TS values per set was from −38 to −17 dB for modal tuna body fork lengths between 55 and 150 cm, that is, a rather thorough range of sizes including ABFT juveniles and adults. The linear regression resulted in a TS-length relationship characterised by a slope of 36.9 dB and an intercept of −101.6 dB, with a coefficient of determination R2 = 87 %. When the slope of the TS-length relationship was forced to 20, the intercept (b20) was −68.5 dB (R2 = 79.5 %). The acoustic parameters presented in this work are key to providing an alternative to the uncertainties associated with the traditionally used fishery-dependent abundance indices of ABFT in the Bay of Biscay and abroad.
期刊介绍:
This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.