Browse > Article
http://dx.doi.org/10.3796/KSFT.2010.46.3.248

In situ side-aspect target strength of Japanese anchovy (Engraulis japonicus) in northwestern Pacific Ocean  

Lee, Hyung-Been (Marine Living Resources Research Department, KORDI)
Kang, Don-Hyug (Marine Living Resources Research Department, KORDI)
Publication Information
Journal of the Korean Society of Fisheries and Ocean Technology / v.46, no.3, 2010 , pp. 248-256 More about this Journal
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
Acoustic model; Anchovy (Engraulis japonicus); In situ measurement; Side-aspect Target strength;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Medwin, H., and C.S. Clay, 1994. Fundamentals of acoustical oceanography, Academic Press, San Diego, pp. 348-404.
2 Shelton, P.A., M.J. Armstrong and B.A. Roel, 1993. An overview of the application of the daily egg production method in the assessment and management of anchovy in the Southeast Atlantic. Bull. Mar. Sci., 53, 778-794.
3 Simmonds, J. and D. MacLennan, 2005. Fisheries acoustics: Theory and practice, second edition. Blackwell, pp. 217-261.
4 SIMRAD, 1997. Operation manual, Simrad EK500 Scientific Echo Sounder, Base version, P2170, A Konsberg Company. pp. 1-104.
5 SonarData, 2000. SonarData EchoView User Guide. Sonar Data Tasmania Pty. Ltd. pp. 47.
6 Statistics Korea, 2010. Fishery production survey. Retrieved from http://fs.fips.go.kr/main.jsp. on 12 Mar. 2010.
7 Zhao, X., Y. Wang and F. Dai, 2008. Depth-dependent target strength of anchovy (Engraulis japonicus) measured in situ. ICES J. Mar. Sci., 65, 882-888.   DOI
8 Kang, D., S. Cho, C. Lee, J-G. Myoung and J. Na, 2009. Ex situ target-strength measurements of Japanese anchovy (Engraulis japonicus) in the coastal Northwest Pacific. ICES J. Mar. Sci., 66, 1219-1224.   DOI
9 Kim, J.Y. and N.C.H. Lo, 2001. Temporal variation of seasonality of egg production and the spawning biomass of Pacific anchovy, Engraulis japonicus, in the southern waters of Korea in 1983-1994. Fish. Oceanogr., 10, 297-310.   DOI
10 Kubecka, J. and A. Duncan, 1998. Acoustic size vs. real size relationships for common species of riverine fish. Fish. Res., 35, 115-125.   DOI
11 MacLennan, D.N. and E.J. Simmonds, 1992. Fisheries Acoustics. Chapman & Hall, London. pp. 124-163.
12 Cho, S., D. Kang, J. Na, J-G. Myung and J. Kim, 2006. Side-aspect target strength measurement of swimbladdered fish using multi-frequencies system: Black sea bream (Acanthopagrus schlegeli). J. Acous. Soc. Kor., 15, 101-109.   과학기술학회마을
13 Boswell, K.M. and C.A. Wilson, 2008. Side-aspect target-strength measurements of bay anchovy (Anchoa mitchilli) and Gulf menhaden (Brevoortia patronus) derived from ex situ experiments. ICES J. Mar. Sci., 65, 1012-1020.   DOI
14 Clay, C.S. and J.H. Horne, 1994. Acoustic models of fish: Atlantic cod (Gadusmorhusa). J. Acous. Soc. Am., 96, 1661-1668.   DOI
15 FAO, 2010. Fishery production statistics. Retrieved from http://www.fao.org/fishery/statistics/global-captureproduction/query/en. on 10 Mar. 2010.
16 Hampton, I., 1996. Acoustic and egg-production estimates of South African anchovy biomass over a decade: comparisons, accuracy, and utility. ICES J. Mar. Sci., 53, 493-500.   DOI
17 Berger, L., C. Poncelet and V.M. Trenkel, 2009. A method for reducing uncertainity in estimates of fish-school frequency response using data from multifequency and multibeam echosounder. ICES J. Mar. Sci., 66, 1155-1161.   DOI