전자저널 > 전자저널 > Environmental Characte ristics of Natural Conditions of the Flat Oyster, Ostrea denselamellosa in Haechang Bay, Korea

Environmental Characte ristics of Natural Conditions of the Flat Oyster, Ostrea denselamellosa in Haechang Bay, Korea

Moon- Ho Yang, Chang- Hee Han, Hyung- Sub Kim and Sang- Duk Choi

South Sea Fisheries Research Institute, National Fisheries Research and Development Agency, Yosu 555-820, Korea

This study was measured environmental factors of flat oyster habitats and biomass of flat oyster to improve the productivity of flat oyster. Water temperature and salinity of the flat oyster habitat ranged from 5.5 to 27.4 ℃ and from 31.2 to 33.4‰, respectively. Average concentrations of DO, COD, DIN and PO4 3 --P were 7.11 mg/l, 0.44 mg/l, 4 .55 ㎍ -at./l and 0.36 g-at./l respectively. Surface sediments at the sampling area were composed of coarse sand, sandy silt and silty sand. Average level of IL, COD and AVS in the surface sediments were 2.6%, 13.70 mg/g·dry and 0.33 mg/g·dry respectively. In each sampling station, total standing crops of phytoplanktons howed peaks twice in February and August. Dominant species of phytoplankton occurred in Haechang Bay through out the year were Skeletonema costatum, Paralia sulcata, Eucampia zodiacus, Chaetoceros curvicetus , C. affinis , C. debilis , C. decipiens , As terionella glacialis , Ps eudonitz s chialongissima, Pseudonitzs chiaseriata, Ceratiumfurca and C. fusus . Ten species of the bivalves were collected at the flat oyster habitat. Most of bivalves were the eutrophic species Ostrea denselamellosa, Crassostrea gigas , Ruditapes philippinarum, Scaphracas ubcrenata, Scapharca broughtonii, Atrina pectinata, Fulvia mutica, Mytilus edulis , Protothaca jedoens is and Megacardita ferruginosa. The mean density of them was 21 inds ./m2 (479.14 g/m2 ), while that of the flat oyster was at 0.25 inds ./m2 (231.25 g/m2 ).

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