The effect of egg quality on larval period and postlarval survival was investigated for the abalone Haliotis discus hannai. Broodstock were conditioned for spawning at different effective accumulative temperatures (EAT) and the subsequent larvae were used in experiments. Larval period until spontaneous metamorphosis or death and postlarval survival without food were investigated. Larval period and postlarval survival of offspring from broodstock conditioned at 1,650 and 2,350°C·days EAT were greater than those of larvae from 1050 and 1150°C·days EAT conditioned broodstock. Biochemical composition and egg cytoplasm diameter were measured as egg quality from broodstock conditioned under different EAT treatments. There was a positive correlation between lipid and protein content in eggs. Protein and lipid content showed positive correlations with larval period and postlarval survival without food. The eggs from higher EAT tended to contain higher protein and lipid contents, but there was no significant difference in protein levels among broodstock conditioned at different EAT. No relationship was found between egg cytoplasm volume, which calculated using egg cytoplasm diameter and larval period or postlarval survival. These results suggest that the quality of eggs became higher as EAT increased, and that protein and/or lipid were important for larval and postlarval survivorship. For H. discus hannai, the biochemical composition of eggs may be more important than yolk volume for early development and survival of larvae and postlarvae.
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Vol. 24 • No. 4