전자저널 > 전자저널 > A Study on the Production of Artificial Seed and Intermediate culture for Attached Spats of the Chinese Stock of a Scallop, Patinopecten yessoensis

A Study on the Production of Artificial Seed and Intermediate culture for Attached Spats of the Chinese Stock of a Scallop, Patinopecten yessoensis

Bong-Se Oh, Jeong-Yong Lee, Se-Ku Park, Chu Lee and Q-Tae Jo

Marine Species Conservation Center, Jeju 668-821, Korea

We investigated artificial mass seed production of a Chinese scallop, Patinopecten yessoensis, in 2004. The GSI (gonad somatic index) of the Chinese scallop, P. yessoensis was 17.2 on mid-February, 20.2 on mid-March, while that of Korean scallop, P. yessoensis was 6.9 on mid-February, 10.8 on mid-March. Matured 120 females and 350 males were selected for artificial mass production. They were exposed in air for 1 hr at over 20℃, and placed into a spawning tank (20 ton) containing sea water treated with UV radiation at 12℃. We gained a total of 228,000 thousand scallop embryos between March 10th and 15th, and reared larvae at the indoor tank during 25 days. When the mean shell length of larvae reached 250 μm and they have eye-spots, the number of pre-settling larvae was 47,500 thousand. We gained 1,850 thousand attached scallop spats from two kinds of collectors. Attached spats were reared in indoor tank for different periods from 5 days to 60 days. They were divided into 5 groups according to the length of reared days. Each group of attached spats was moved to intermediate rearing sites at Yangyang fishing port in Gangreung-city for acclimation to ocean environments. The highest survival rate of attached spats was 13.0% shown at the group reared for 12 days, but the significant difference in their growth was not found between the groups. The shell length of artificial attached spats increased from 0.9 μm on July 10th to 24.7 μm on December 16th with the survival rate of 85.0% while that of natural attached spats increased from 0.6 μm on July 10th to 23.9 μm on December 16th with the survival rate of 85.7%.

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