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Depth-dependent target strength of anchovy (Engraulis japonicus) measured in situ

文献类型： 外文期刊

作者： Zhao, Xianyong 1 ; Wang, Yong 1 ; Dai, Fangqun 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Key Lab Sustainable Utilizat Marine Fisheries Res, Minist Agr, Qingdao 266071, Peoples R China

关键词： anchovy;Boyle's law;depth-dependence;target strength;Yellow Sea

期刊名称：ICES JOURNAL OF MARINE SCIENCE （ 影响因子：3.593； 五年影响因子：4.037 ）

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收录情况： SCI

摘要： Three sets of target strength (TS) data were collected in the southern part of the Yellow Sea using a calibrated, 38 kHz, Simrad EK500 split-beam echosounder. Midwater trawl sampling showed that >97% of the catch by number was anchovy (Engraulis japonicus), with total lengths ranging from 6 to 15 cm, and that the arithmetic-mean length and root-mean-square length were 10.6 and 10.8 cm, respectively. The mean TS of anchovy in the 10-45-m layer was estimated to be -50.9 dB, with a 95% confidence interval of (-51.0, -50.8) dB. The TS data showed, however, a clear depth-dependence that was very close to and not significantly different from what might be expected according to Boyle's law. The TS model was estimated to be TS = 20 log L - 71.6 for the conventional relationship between TS and length, but TS = 20 log L- (20/3) log (1+z/10) - 67.6 when the depth (z, m) effect was included according to Boyle's law. These results may have a significant influence on abundance estimates of anchovy derived from acoustic surveys, both in the Yellow Sea and in other parts of the world.

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