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자료유형
학술저널
저자정보
저널정보
한국수산과학회 양식분과 한국양식학회지 한국양식학회지 제16권 제1호
발행연도
2003.2
수록면
24 - 30 (7page)

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Studies of the seed production of Urechis unicinctus were conducted under the laboratory conditions to obtain some information for the U. unicinctus culture. The experiment included developmental studies of the egg development, larval culture, sediment preference and growth of young U. unicinctus. The experiment were conducted from March to August, 2000. The adults of U. unicinctus collected in Namhae-do, Korea. The developments of the fertilized eggs were observed under a light-microscope at intervals of one hour after containing with density of one individual per 1 ml. The larvae were fed with Phaeodactylum tricornutum cultured at the laboratory. The concentration of the phytoplankton for the feed was 30,000 cells per individual larva. With progress of development, the food concentration was gradually increased, up to 10,000 cells per individual for the youngU. unicinctus. Trochophore larvae appeared on the 68 hours after hatching. On the 32 days after hatching, over 50 % of fertilized eggs developed into young U. unicinctus. In order to investigate the effect of sediment on the growth and burrowing of U. unicinctus, the young worms were reared in tanks with different grain sizes. The highest value of sediment preference and survival rate of U. unicinctus was shown in the mixture sediment group with below 0.10 ㎜, 1.01~12.00 ㎜, over 3.01 ㎜ and shell. The lowest value in both sediment preference and survival rate of U. unicinctus was observed in 1.01~2.00 ㎜ grain size.

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