전자저널 > 전자저널 > Dietary Value of Three Benthic Diatom Species on Haliotis discus hannai Larvae

Dietary Value of Three Benthic Diatom Species on Haliotis discus hannai Larvae

Se Jin Park and Sung Bum Hur

Department of Marine Bio-materials and Aquaculture, Pukyong National University, Busan 608-737, Korea

Although the method of seedling production of Haliotis discus hannai is well known, the optimum benthic diatom species as a live food at early larval stage are not fully developed. In this study three Pennales diatom species, Caloneis schroederi, Rhaphoneis sp., and Cocconeis californica were examined on settlement, metamorphosis, survival, and growth of Haliotis discus hannai larvae. The larvae fed Raphoneis sp. or C. californica showed high settlement rate with 80-82% within 48 hrs, which was significantly higher than those fed C. schroederi or mixed diets with three diatom species. The larvae fed the former microalgal species also showed higher metamorphosis rate with 32-34% than the latter species with 10-12% within 4 days. With regard to survival and growth of the larvae, single diet with Rhaphoneis sp. or C. californica had better dietary value than the mixed diets for the early larvae of H. discus hannai.

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