Growth Characteristics of Bay Scallop (Argopecten irradians) reared in the Southern East Sea
Young Dae Kim, Chu Lee, Jeong Min Shim, Gi Seung Kim, Jae-Suk Choi and Myung-Mo Nam
Aquaculture Industry Division, ESFRI, Gangneung 210-860, Korea Fisheries Resources and Environment Division, ESFRI, Gangneung 210-860, Korea Division of Bioindustry, Silla University, Busan 617-736, Korea

Bay scallop (Argopecten irradians) has been farmed only in the South Sea of Korea. East Sea Fisheries Research Institute (ESFRI) has developed bay scallop aquaculture technologies to extend its aquaculture area to the Southeast Sea of Korea. For the artificial spawning, the water temperature was maintained at 23℃. Over 100,000,000 eggs were spawned through artificial spawning inductions, such as air exposure and thermal shock by rising the water temperature. The fertilization rate was over 91% with nearly 94,000,000 fertilized eggs. The shape of fertilized eggs was spherical with an average diameter of 61.7 ± 0.05 μm (54.1-67.4 μm). Five days after fertilization, the eggs developed into prodissoconch shell, and continuously grew into umbo stage and then umbones stage. After 8 days of fertilization, the size of larva became 179.7 ± 8.4 μm on average (150.4-204.8 μm), and the larva formed a foot and an eye spot. The larvae grew to 235.4 ± 9.7 μm in 10 days and attached to adherence material, becoming juvenile bay scallop. The shells grew from 22.71 mm to 72.40 mm in 6 month (June-December).  The total weight increased from 2.0 g to 32.7 g at the same period. The daily growth rates of young scallop were 0.35 mm d-1 (Apr. to Jun.) and 0.41 mm d-1 (Jun. to Aug.), which were comparable to those found in the South Sea. These findings suggest that the bay scallop aquaculture may be suitable in the Southeast Sea of Korea and may provide an additional crop to aquaculturists.

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