Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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In situ side-aspect target strength of Japanese anchovy (Engraulis japonicus) in northwestern Pacific Ocean

북서 태평양 멸치(Japanese anchovy)에 대한 측면 음향 반사강도 특성

  • 이형빈 (한국해양연구원 해양생물자원연구부) ;
  • 강돈혁 (한국해양연구원 해양생물자원연구부)
  • Received : 2010.05.17
  • Accepted : 2010.08.09
  • Published : 2010.08.31
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Abstract

Acoustic side-aspect target strength (TS) of living Japanese anchovy (Engraulis japonicus) was measured at 120kHz during in situ experiments. The data were collected by lowering and horizontally projecting the splitbeam transducer into the anchovy school. For analysis and interpretation of the side-aspect TS data, acoustic theoretical model, based on the fish morphology, and dorsal-aspect TS data were used. Total length of the anchovy ranged from 6.6 to 12.8cm (mean length 9.3cm). The side-aspect TS distributed between -40 and -55dB, has an obvious length dependency. The mean side-aspect TS of the anchovy was -47.8dB, and the TS was about 2dB higher than mean TS generated from dorsal-aspect measurements. With reference to maximum TS, the results of the side-aspect TS were distributed within the range of the theoretical and dorsal-aspect TS. Apparently these tendency indicates that side-aspect TS measured from the study is useful data. These in situ measurements of side-aspect TS can be applied to improve acoustic detection and estimates of the anchovy, and is necessary to measure with a various frequency and length for making enhance data.

Keywords

Acknowledgement

Grant : 유비쿼터스 해양유용/유해생물 관리기술 개발, 통영 MRC(해양생물자원보존 연구센터)를 기반으로 한 남해 연안 해양생물자원 종 보존 및 활용 연구

Supported by : 한국해양연구원

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