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http://dx.doi.org/10.5657/kfas.2005.38.1.039

Seasonal Variation in Species Composition of Fish Collected by a Bag Net in the Geum River Estuary, Korea  

HWANG Sun-Wan (Department of Oceanography, Chungnam National University)
HWANG Hak-Bin (Department of Oceanography, Chungnam National University)
NOH Hyung-Soo (Department of Oceanography, Chungnam National University)
LEE Tae-Won (Department of Oceanography, Chungnam National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.38, no.1, 2005 , pp. 39-54 More about this Journal
Abstract
Seasonal variation in species composition of fish in the Geum River estuary was determined using monthly samples collected with a bag net from February to December 2003. Of a total of seventy-three species collected, four groups of fishes were distinguished. Estuarine fishes such as Chelon haematocheilus and Synechogobius hasta were collected almost all the seasons and predominated in abundance during cold months. Coastal fish species such as Sardinella zunasi, Konosirus punctatus, Engraulis japonicus, Johnius grypotus and Thryssa kammalensis were dominated from late spring to autumn. Their adults entered into the estuary in spring and a large number of their juveniles were collected in summer and autumn till moving out to deeper waters for over-wintering. A few freshwater fishes were collected when the freshwater was discharged during the rainy season. Anguilla japonica elvers (diadromous fish) and Coilia nasus (amphidromous fish) were collected in spring during their upstream migration. The principal component analysis revealed that the seasonal variation in species composition of fishes was principally determined by water temperature and/or water temperature related factors.
Keywords
Fish species composition; Coastal fish; Diadromous fish; Estuarine fish; Geum River estuary;
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