Distribution and biomass estimation of Corbicula japonica in the Seomjin River, Korea
Mi-Hee Lee, Jong-Deok Choi, Gil-Hae Noh, Su-Jeong Shin and Dong-Ki Ryu
Fisheries Research and Environment Division, National Institute of Fisheries Science, Yeosu 59780, Korea Department of Aquaculture and Aquatic Science, Kunsan National University, Gunsan 54150, Korea
To investigate the habitat environment and distribution of Corbicula japonica, salinity, sediment  composition and its densities were investigated in the Seomjin River. Salinity in the study area ranged from 0.08 to 23.18 psu. Sediment composition was sand or silty sand. The sorting values ranged from 1.0 to 2.7 Ø (mean 1.5 Ø), and the water content (%) and ignition loss (%) were higher in the downstream than in the upstream. Density of C. japonica ranged from 2.5 to 33.7 inds./m2. Density near Mokdo (Site 3) was the highest and that near Gojeon (Site 1) and Dugok (Site 8) was low. In addition, a resource survey of C. japonica was conducted to estimate its biomass in 3 times. The total biomass in the Seomjin River was estimated to be 191.1 tons with the biomass of Mokdo (Site 3) the highest.
  
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