Effect of Feeding Microdiet and Yolk-sac Larvae of Spangled Emperor <I>Lethrinus nebulosus</I> at Different Ages on Survival and Growth of Pacific Bluefin Tuna <I>Thunnus orientalis</I> Larvae
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概要
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Pacific bluefin tuna (PBT) <I>Thunnus orientalis</I> larvae at 18 days post hatching (dph) (total length; 14.8±2.1 mm) were fed for 6 days on fertilized eggs, yolk-sac larvae of spangled emperor <I>Lethrinus nebulosus</I> at 1 or 3 dph, or a microdiet. After feeding, growth performance, feeding incidence and survival were evaluated. Feeding 3 dph spangled emperor yolk-sac larvae improved growth of PBT compared to the other feeds. Crude protein and essential amino acids contents in the 3 dph spangled emperor yolk-sac larvae were higher than those of the spangled emperor at 1 dph. This result suggests that yolk-sac larvae of spangled emperor at 3 dph are suitable for PBT larvae and improved growth would be due to their higher protein and essential amino acids contents. It was also observed that 40% of PBT larvae fed the microdiet, suggesting that casein peptide based microdiet is acceptable for PBT.
- 日本水産増殖学会の論文
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