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http://dx.doi.org/10.4217/OPR.2019.41.1.011

Acoustical Survey for Estimating Fish Biomass at Chilam Bay, Korea  

Nduwayesu, Evarist (National Fisheries Resources Research Institute, NaFIRRI)
Hwang, Bo-Kyu (Department of Marine Science and Production, Kunsan National University)
Lee, Dae-Jae (Division of Marine Production System Management, Pukyong National University)
Shin, Hyeon-Ok (Division of Marine Production System Management, Pukyong National University)
Publication Information
Ocean and Polar Research / v.41, no.1, 2019 , pp. 11-18 More about this Journal
Abstract
This acoustic experiment noted that fish species in Chilam-Gijang marine ranching area were more densely distributed in the pelagic zone during nighttime than daytime. In each season, the gill nets caught 15 different fish species and the estimated average target strengths were -44.0 dB and -44.4 dB for autumn and winter surveys, respectively. The estimated autumn fish biomass were 7.7 tons and 26.0 tons during daytime and nighttime, respectively. Winter biomass was 2.27 tons and 30.97 tons during daytime and nighttime, respectively. Different fish species form schools that exhibit different movements and behaviors, and thereby occupy varying water layers. These results explained the estimated fish biomass, and variation with seasons and time of the surveys around artificial reefs in Chilam Bay, Korea.
Keywords
acoustical survey; Chilam Bay; split beam; target strength; fish biomass;
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