Side-aspect target strength measurement of swimbladdered fish using multi-frequencies system: Black sea bream (Acanthopagrus schlegeli) KCI

Title
Side-aspect target strength measurement of swimbladdered fish using multi-frequencies system: Black sea bream (Acanthopagrus schlegeli)
Alternative Title
Side-aspect target strength measurement of swimbladdered fish using multi-frequencies system: Black sea bream (Acanthopagrus schlegeli)
Author(s)
조성호; 강돈혁; 나정열; 명정구; 김종만
KIOST Author(s)
Kang, Don Hyug(강돈혁)Myoung, Jung Goo(명정구)
Publication Year
2006-09
Abstract
Besides dorsal-aspect target strength (TS) of the fish, side-aspect TS information is also acoustically important parameter in fisheries acoustics. In this study, the side-aspect TS of 11 black sea bream (Acanthopagurus schlegeli) were measured using a split-beam echosounder of 120, 200, and 420 kHz; total length of the fish ranged from 12.4 to 23.7 cm, and wet weight from 27.5 to 229.8 g. For the precise TS measurement with side-aspect angle, we used anesthetized and tethered specimens of known size while being rotated through 360° by means of a carousel structure. The side-aspect TS measurements of the fish were conducted by rotating the fish in the horizontal plane at 5° interval. The ping interval was 0.2 second and elapsed time at each angle was 30-60 second. As a result, the measured side-aspect TS data were fitted by sinusoidal function. The relationships between fish length and near full side-aspect TS were as follows: TS120 kHz = 21.46 log (TL)-67.5 (r = 0.70), TS200 kHz= 31.03 log (TL)-76.9 (r = 0.83), TS420 kHz= 30.79 log (TL)-72.2 (r = 0.77). For comparison, theoretically estimated side-aspect TS from the Kirchhoff ray mode (KRM) model, which based on swimbladder and body morphology, were compared with the measured TS.
ISSN
1225-4428
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4845
Bibliographic Citation
한국음향학회지, v.25, no.3E, pp.101 - 109, 2006
Publisher
한국음향학회
Keywords
Black sea bream; Ex situ experiments; Kirchhoff ray mode model; Side-aspect target strength.
Type
Article
Language
English
Publisher
한국음향학회
Related Researcher
Research Interests

Fish ecology,Fish taxonomy,Fish stock enhancement,어류생태,어류분류,어류자원증식

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