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

Access this Article

Search this Article

Author(s)

Abstract

アルテミアの給与がクロマグロ仔魚の成育不良を引き起こすとされる原因の一端を推察するために, ワムシをリファレンスとし, 栄養強化したアルテミアとその代替餌料であるイシダイ卵黄仔魚の栄養素を比較した。その結果, アルテミアで糖質含量が高く, ホスファチジルコリン, ステロールエステルおよび中性・極性脂質画分のドコサヘキサエン酸 (DHA) レベルは低かった。さらに, アルテミアとイシダイ卵黄仔魚を与えてクロマグロ仔魚を飼育したところ, 成長や生残は後者を与えたクロマグロ仔魚で優れ, 全魚体の中性・極性脂質画分におけるDHAレベルも高かった。したがって, アルテミアにおけるこれら栄養素の過不足が, クロマグロ仔魚の成育に悪影響を及ぼしている可能性が推察された。

Feeding of<I>Artemia</I>enriched with commercial enrichers (enriched<I>Artemia</I>) induces the growth failure of the Pacific bluefin tuna (PBT) <I>Thunnus orientalis</I>larvae 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, enriched<I>Artemia</I>, and yolk-sac larvae of Japanese knifejaw<I>Oplegnathus fasciatus</I>and 2) a preliminary rearing trial of bluefin tuna larvae by feeding either enriched<I>Artemia</I>or 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 enriched<I>Artemia</I>. The carbohydrate content in enriched<I>Artemia</I>was 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 enriched<I>Artemia</I>. The PBT larvae fed yolk-sac larvae had significantly higher levels of triacylglycerol and DHA. The results suggest that the nutritional inferiority of enriched<I>Artemia</I>to yolk-sac larvae is partly responsible for the growth failure of PBT larvae fed enriched<I>Artemia</I>.

Journal

  • Aquaculture Science

    Aquaculture Science 55(1), 55-64, 2007-03-20

    Japanese Society for Aquaculture Science

References:  38

Codes

  • NII Article ID (NAID)
    10018871068
  • NII NACSIS-CAT ID (NCID)
    AN00124667
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    03714217
  • NDL Article ID
    8755907
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-761
  • Data Source
    CJP  NDL  J-STAGE  JASI 
Page Top