전자저널 > 전자저널 > Reproductive Cycle and the Sex Ratio of Corbicula japonica from Namdae Stream in Gangwon-do, Korea

Reproductive Cycle and the Sex Ratio of Corbicula japonica from Namdae Stream in Gangwon-do, Korea

Wan-Ki Kim, Jeong-Young Lee, Chae-Sung Lee, Chul Min An, Hyoung Soo Kim, Choel-Young, Choi, Jae Won Kim, Ee-Yung Chung and Bong-Seok Kim

Biotechnology Research Center, National Fisheries Research and Development Institute, Busan, 619-902, Korea

Reproductive cycle and sex ratio of the marsh clam Corbicula japonica, a oviparous clam, were investigated monthly by histological observation. Samples were collected in brackish water of Namdae stream on the east coast of Korea from November 2000 to October 2001. It was able to devide the reproductive cycle of this species into five successive stages; early active (April to June), late active (May to June), ripe (June to August), partially spawned (June to September), spent (September to January) and resting stage (February to April). The spawning period was from July to September, and the main spawning occurred between August and September when seawater temperatures reached above 26℃. Mature eggs of Corbicula japonica were 60-70 μm in diameter. The sex ratio of individuals over 10.1 mm in shell length was about 1:1 (χ2 = 1.22, p > 0.05).

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