Ex situ target-strength measurements of Japanese anchovy (Engraulis japonicus) in the coastal Northwest Pacific
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- Ex situ target-strength measurements of Japanese anchovy (Engraulis japonicus) in the coastal Northwest Pacific
- Kang, Donhyug; Cho, Sungho; Lee, Changwon; Myoung, Jung-Goo; Na, Jungyul
- KIOST Author(s)
- Kang, Don Hyug(강돈혁); Myoung, Jung Goo(명정구)
- The Japanese anchovy (Engraulis japonicus) is an important species in regard to the fisheries and ecology of the coastal Northwest Pacific. Measurements of ex situ target strength (TS; dB re 1 m(2)) were made on live anchovy using 38, 120, and 200 kHz split-beam echosounders. The fish were tethered using small hooks attached to their mouths. During the acoustic measurements, an underwater video camera was used to continuously monitor fish behaviour and tilt-angle (theta). Data for 35 individual anchovy ranging from immature to adult sizes (total lengths L(T) = 4.8-12.2 cm) were analysed. Least-squares regression fits of TS vs. log(L(T)) were: TS(38 kHz) = 20 log(L(T)) - 65.8 (r(2) = 0.82), TS(120 kHz) = 20 log(L(T)) - 68.4 (r(2) = 0.84), and TS(200 kHz) = 20 log(L(T)) - 69.1 (r(2) = 0.71). The LT vs. wet weight (W; g) relationship for these fish was W = 0.0036 L(T)(3.204). The mean theta for anchovy swimming freely in a large seawater tank was 9.1 degrees (s.d. = 13.1 degrees). These ex situ measurements of TS, L(T), W, and theta can be applied to improve acoustic estimates of Japanese anchovy biomass.
- ICES JOURNAL OF MARINE SCIENCE, v.66, no.6, pp.1219 - 1224, 2009
- OXFORD UNIV PRESS
- IN-SITU; SOUND-SCATTERING; ACOUSTIC MODELS; FISH
- acoustic target strength; ex situ measurement; Japanese anchovy; tilt-angle
- Article; Proceedings Paper
- OXFORD UNIV PRESS
- Related Researcher
Fish ecology,Fish taxonomy,Fish stock enhancement,어류생태,어류분류,어류자원증식
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