Abstract
Settlement of larvae, growth, and survival of juvenile abalone (Haliotis discus hannai) were examined after feding of 5 species of benthic diatoms (Cocconeis suctellum, Navicula sp Nitzschia longissima Bacillavia paxillifera, Licmophora flabellata). All of the benthic diatoms were isolated from natural populations on plastic plates for the abalone. The settlement of larvae, shell growth, and survival rate of juvenile abalone varied by diatoms species. The highest settlement rate of larvae was <TEX>$43.1\%$</TEX> with the Cocconeis suctellum diet. Daliy growth rate reached a maximum at 64.1 <TEX>${\mu}m/day$</TEX> with the Navicula sp. diet and a minimum at 22.4 <TEX>${\mu}m/day$</TEX> with the Licmophora flabellata diet. Survival rate of the juvenile abalone was highest at <TEX>$62.0\%$</TEX> with the Navicula sp., Cocconeis suctellum , and Nitzschia longissima diets. Survival rate of the Juvenile abalone was significantly higher than the control group with mixed diatom population diets (P<0.05). Therefore, diatom . species composition in diets can be a controling factor for the settlement, growth, and survival rates of Juvenile abalone.
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