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http://dx.doi.org/10.3796/KSFT.2014.50.4.476

Backscattering strength and vertical distribution of dominant fishes in inland waters by hydroacoustics  

Yang, Yong-Su (Fisheries System Engineering Division, National Fisheries Research & Development Institute)
Lee, Kyounghoon (Division of Marine Technology, Chonnam National University)
Hwang, Bo-Kyu (Division of Marine Science and Production, Kunsan National University)
Lee, Hyungbeen (Fisheries System Engineering Division, National Fisheries Research & Development Institute)
Kim, In-Ok (Aquaculture Industry Division, West Sea Fisheries Research Institute)
Kim, Seonghun (Fisheries System Engineering Division, National Fisheries Research & Development Institute)
Publication Information
Journal of the Korean Society of Fisheries and Ocean Technology / v.50, no.4, 2014 , pp. 476-486 More about this Journal
Abstract
This study is aimed to understand the vertical distribution of fish in the daytime and nighttime using an acoustic survey in Yondam reservoir of Jeollabuk-do, and an acoustical backscattering strength of dominant species, bass (Micropterus salmoides) and a bluegill (Lepomis macrochirus), which are classified as the ecosystem disturbing species. The results showed that the fish school was distributed in the shallow areas of less than 10 m depth during the period of Aug. and Oct. where it had a strong thermocline, otherwise, it was distributed over 10-times density under stable water temperatures as $13^{\circ}C$ in Nov. There was no vertical patchiness difference between daytime and nighttime unlike the typical marine ecosystem. The dominant species were crucian carp, bluegill, bass. The hydroacoustic method can provide the spatial distribution and effective removal ways of the ecosystem disturbing species in inland fisheries.
Keywords
Backscattering strength; Hydroacoustic survey; Yongdam reservoir; Scientific echosounder; Vertical distribution;
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