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ATTRACTION OF ANIMAL DIETS TO THE LARVAE OF RAPANA VENOSA
Author(s): 
Pages: 1578-1583
Year: Issue:  6
Journal: Oceanologia et Limnologia Sinica

Keyword:  Rapana venosaplanktonic larvaeanimal feedattractive force;
Abstract: We studied the attraction of fresh and boiled shellfish tissues to planktonic larvae of Rapana venosa. The diet transition occurred in the four-spiral whorls stage of R. venosa. The opportune moment to release adhesive substratums and animal feeds is during a period from the 1st to 6th day after larvae developing to late three-spiral whorls stage(cultured in 25℃). The results show that(1) both fresh and boiled shellfish tissues attracted the larvae;(2) the ratio of four-spiral whorls stage larvae on fresh shellfish tissues was significantly higher than that of the larvae in other spiral whorls stages;(3) the ratio of larvae for fresh Mytilus edulis was 33.75%, which is significantly higher than those of other shellfish diets;(4) in regard to boiled shellfish tissues, attraction to the larvae from Crassostrea gigas was greater than from M. edulis, Ruditapes philippinarum, Mactra chinensis, skirt powders of Argopecten irradians, and the control group. These findings suggest that fresh M. edulis and boiled C. gigas tissues are potential animal feeds during the diet transition phase for R. venosa larvae.
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