In situ target strength measurements of Peruvian anchovy (Engraulis ringens) from data collected by a commercial echosounder during fishing operations

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research Pub Date : 2025-09-15 DOI:10.1016/j.fishres.2025.107534

Martin Santivañez-Yuffra , Nathaly Pereira-Letona , Cynthia Vasquez-Paredes

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引用次数: 0

Abstract

Although fishing vessels have been used as opportunistic scientific platforms in the last two decades, target strength (TS) studies based on industry-collected data are still scarce. Here we present an in situ TS estimation of Peruvian anchovy (Engraulis ringens) from data recorded by a 120 kHz Simrad ES60 commercial echosounder mounted on the purse-seiner “Maru” in May-July 2017 during its fishing operations on North-Center stock area. TS-length (L) relationships (TS=a Log₁₀ (L)+b, with b= b₂₀ when a= 20) were estimated from pooled data using a curve fitting method. Influence of depth (Z) on TS was also investigated. Mean TS of 10–16.5 cm individuals was −54.2 dB (±0.2 dB) with corresponding a, b and b₂₀ values of 22.2, −79.5 dB and −77 dB. TS showed strong dependence with depth following Boyle’s law: TS= 20Log₁₀(L)-6.4Log₁₀(1-Z/10)-73.3 dB (r²=0.8). Our TS and b₂₀ estimates are in line with existing values for E. ringens in Perú but are lower than those published for the same species in Chile and from other members of the Engraulis genus. Results reported here can be used for biomass estimation during periods not covered by systematic surveys, helping to achieve near-real time monitoring of stocks.

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根据商业回声测深仪在捕鱼作业期间收集的数据对秘鲁凤尾鱼（Engraulis ringens）的原位目标强度进行测量

尽管渔船在过去二十年中被用作机会主义的科学平台，但基于行业收集数据的目标强度（TS）研究仍然很少。在这里，我们根据安装在“Maru”号围网渔船上的120 kHz simmrad ES60商用回声测深仪于2017年5月至7月在中北部种群区捕捞作业期间记录的数据，对秘鲁凤尾鱼（engrulis ringens）进行了现场TS估计。用曲线拟合的方法从汇总数据中估计TS-length (L)关系（TS=a Log10 (L)+b，当a= 20时，b= b20）。研究了深度(Z)对TS的影响。10-16.5 cm个体的TS平均值为- 54.2 dB（±0.2 dB），对应的a、b和b20值分别为22.2、- 79.5 dB和- 77 dB。TS与深度有很强的相关性，遵循波伊耳定律：TS= 20Log10(L)-6.4Log10(1-Z/10)-73.3 dB （r2=0.8）。我们的TS和b20估计值与Perú的现有值一致，但低于智利公布的同一物种和其他Engraulis属成员的估计值。这里报告的结果可用于系统调查未涵盖期间的生物量估计，有助于实现对种群的近实时监测。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fisheries Research 农林科学-渔业

CiteScore

4.50

自引率

16.70%

发文量

294

审稿时长

15 weeks

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.