ガザミ幼生の脱皮率に及ぼすEPAとDHAの影響  [in Japanese] The Effect of Dietary EPA and DHA on the Molting Rate of Larval Swimming Crab Portunus trituberculatus  [in Japanese]

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Author(s)

Abstract

n-3高度不飽和酸(n-3HUFA)であるエイコサペンタエン酸(EPA)とドコサヘキサエン酸(DHA)のガザミ幼生の脱皮および変態に及ぼす影響を明らかにすることを目的に, 脱皮・変態率の推移や齢期所要日数, さらに使用した餌料中の脂肪酸含量等を検討した。その結果, ガザミ幼生はEPAとDHAの要求性が異なり, EPAは生残維持に, DHAは成長を速めたり, 第1齢稚ガニの全甲幅を大きくすることに機能すると推察され, 第3齢ゾエアに与える餌料中のEPAとDHAの割合がガザミ幼生の大量減耗の防除に重要であることが示唆された。

This experiment was conducted to investigate the effectiveness of two n-3 highly unsaturated fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), for larval swimming crab Portunus trituberculatus. Two experiments were carried out in 1l beakers with duplicate lots, each holding 30 larvae. Starting with the larval stage zoea 3, and though the megalopa stage, they were fed Artemia containing different amounts of EPA and/or DHA prepared using emulsifed oils (EPA ethyl ester, DHA ethyl ester, and DHA38G). During the feeding experiments, the molting rate and the inter-molt period in days to reach each stage were measured. It was found that EPA and DHA had different roles in larval development. EPA was effective in maintaining the survival rates for larvae, while DHA accelerated the developmental period and improved the growth of carapace. The highest molting rate and largest carapace width at the first crab were observed when the larvae were fed Artemia enriched with DHA 38G from the zoea 3 stage. Larvae fed unenriched Artemia had low molting rates and the smallest carapace width. These results suggest that it is important to feed the swimming crab with Artemia containing both EPA and DHA from the zoea 3 stage to avert the high rate of cannibalism among them during mass seed production.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 65(6), 998-1004, 1999-11-15

    The Japanese Society of Fisheries Science

References:  7

Cited by:  10

Codes

  • NII Article ID (NAID)
    110003144923
  • NII NACSIS-CAT ID (NCID)
    AN00193422
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    00215392
  • NDL Article ID
    4916238
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-345
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE  NDL-Digital 
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