Possible Nutrients in Artemia Affecting the Larval Growth of Pacific Bluefin Tuna Thunnus orientalis

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  • クロマグロ仔魚の成育に悪影響を及ぼすアルテミアの栄養素

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Abstract

Feeding ofArtemiaenriched with commercial enrichers (enrichedArtemia) induces the growth failure of the Pacific bluefin tuna (PBT) Thunnus orientalislarvae but feeding of yolk-sac larvae of marine fish promotes larval growth. However, the underlying causes of this phenomenon have never been explained. Therefore, in this study, two consecutive experiments, 1) a nutritional comparison among enriched rotifers, enrichedArtemia, and yolk-sac larvae of Japanese knifejawOplegnathus fasciatusand 2) a preliminary rearing trial of bluefin tuna larvae by feeding either enrichedArtemiaor yolk-sac larvae, were conducted to predict the possible nutritional cause (s) . No remarkable differences were found in proximate and amino acid compositions among the live feed, while phosphatidylchorine, sterol ester, and docosahexaenoic acid (DHA) levels were comparatively low in enrichedArtemia. The carbohydrate content in enrichedArtemiawas similar to that in enriched rotifers but higher than that in yolk-sac larvae. In the rearing trial for 6 days, the growth and survival of PBT larvae fed yolk-sac larvae were superior to those fed enrichedArtemia. The PBT larvae fed yolk-sac larvae had significantly higher levels of triacylglycerol and DHA. The results suggest that the nutritional inferiority of enrichedArtemiato yolk-sac larvae is partly responsible for the growth failure of PBT larvae fed enrichedArtemia.

Journal

  • Aquaculture Science

    Aquaculture Science 55 (1), 55-64, 2007

    Japanese Society for Aquaculture Science

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