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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on April 24, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(6):882-888; doi:10.1093/icesjms/fsn055
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

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

Xianyong Zhao, Yong Wang and Fangqun Dai

Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 106 Nanjing Road, Qingdao 266071, People's Republic of China

Correspondence to X. Zhao: tel: +86 532 85835363; fax: +86 532 85811514; e-mail: zhaoxy{at}ysfri.ac.cn

Zhao, X., Wang, Y., and Dai, F. 2008. Depth-dependent target strength of anchovy (Engraulis japonicus) measured in situ. – ICES Journal of Marine Science, 65: 882–888.

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.

Keywords: anchovy, Boyle’s law, depth-dependence, target strength, Yellow Sea

Received 12 January 2007; accepted 28 January 2008; advance access publication 24 April 2008.


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