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首页> 外文期刊>ICES Journal of Marine Science >Methods and results of in situ target-strength measurements of Atlantic cod (Cadus morhua) during combined trawl-acoustic surveys
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Methods and results of in situ target-strength measurements of Atlantic cod (Cadus morhua) during combined trawl-acoustic surveys

机译：拖网声调查中大西洋鳕（Cadus morhua）原位目标强度测量的方法和结果

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摘要

This paper presents methods for collecting acoustic and biological data, including in situ target-strength (TS) estimates of fish, with results presented for Atlantic cod (Gadus morhua) obtained from combined trawl-acoustic surveys. These include fish in the small, average, and maximum length classes, within the range 5-136 cm (total fish length, L_T). The investigations were done using Simrad EK500/EK60 echosounders with split-beam transducers and special post-processing software. Based on an analysis of data collected in the Barents Sea during 1998-2007, a relationship TS = 25.2 log_(10)(L_T) - 74.8 was obtained for Atlantic cod at 38 kHz, with TS in dB and L_T in centimetres. Seasonally, and for depths between 50 and 500 m, the variability in cod TS was 3.1 dB, decreasing with depth. The largest day-night difference in mean TS was in August-September, with changes as large as 1.0-1.7 dB. In the other seasons, the day-night difference was <1.0 dB.
机译：本文介绍了收集声音和生物学数据的方法，包括鱼类的原位目标强度（TS）估计，以及从联合拖网声调查获得的大西洋鳕（Gadus morhua）的结果。其中包括小，平均和最大长度的鱼类，范围在5-136厘米（鱼的总长度，L_T）。研究是使用Simrad EK500 / EK60回声测深仪和分束式换能器以及特殊的后处理软件完成的。根据对1998-2007年在巴伦支海收集的数据的分析，对于大西洋鳕鱼在38 kHz处获得TS = 25.2 log_（10）（L_T）-74.8的关系，TS的单位为dB，L_T的单位为厘米。季节性地，对于50至500 m之间的深度，鳕鱼TS的变异性为3.1 dB，随深度而减小。平均TS的最大昼夜差异是在8月至9月，变化幅度最大为1.0-1.7 dB。在其他季节，昼夜差异小于1.0 dB。

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