Abstract
Two species of naked dinoflagellates Gyrodinium instriatum and Gymnodinium sanguineum were offered to first-feeding larvae of the Japanese anchovy Engraulis japonica in order to determine their value as food organisms. The fate of 14C labelled G. instriatum was followed for 6-8h. About 17% of ingested carbon was respired as 14C02 and 18-52% was retained in the body. This shows that the dinoflagellate is utilized as an energy source for larval anchovy. Larvae fed with only dinoflagellates (20-250 cells/ml) did not survive and grow, although those fed with dinoflagellates (20-200cells/ml) with rotifer (10ind./ml) showed both higherlarval survival and growth rates than those fed with rotifer (10ind./ml) only. These results suggest that the present two species of dinoflagellates could play a supplementary role under natural conditions of low micro-zooplankton density to sustain better survival and growth of larval anchovy.
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