Effects of Dietary N-3HUFA on Larval Morphogenesis and Metamorphosis to Megalops in the Seed Production of the Mud Crab, Scylla serrata(Brachyura: Portunidae).

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  • アミメノコギリガザミ幼生の形熊形成とメガロパヘの変態に及ぼす餌料性高度不飽和酸含量の影響
  • Effects of dietary N-3HUEA on larval morphogenesis and metamorphosis to megalops in the seed production of the mud crab, Scylla serrata (Brachyura: porounidae)

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Abstract

Effects of dietary n-3 highly unsaturated fatty acids (n-3HUFA) on larval morphogenesis and metamorphosis to megalops in the seed production of the mud crab, Scylla serrata were investigated. Four seed production experiments were conducted using one to two 100kl concrete tanks (total of seven trials) . The larvae were fed on rotifers and after the third or fourth zoeal stage with Artemia nauplii. Minced mysid was also given from the megalopal stage. Rotifers were enriched with n-3HUFA before being fed to the larvae. The larvae were reared in the tanks with an addition of phytoplankton (freshwater Chlorella and/or freshwater Chlorella containing n-3HUFA in the cells) . The larvae were also reared in a tank without phytoplankton supplementation. The larval survival, morphological features of the last stage zoeas (fifth stage) and frequency of abnormal molting during the metamorphosis to megalops were examined. Furthermore, lipid and fatty acid contents of the rotifers and larvae were analyzed. The fifth stage zoeas that had morphological features similar to those of megalops such as long endopods of the second antennae, large rudimentary chelipeds and long pleopods with plumose setae were unable to successfully metamorphose to megalops and mass mortality occurred. The larval morphogenesis was accelerated according to the n-3HUFA content of the rotifers in the seed production tank. Fatty acid content in the rotifers was affected by the phytoplankton added to the larval rearing water and it is concluded that the upper limit content of n-3HUFA in the rotifers is around 0.6% for the seed production of S. serrata.

Journal

  • Aquaculture Science

    Aquaculture Science 50 (3), 333-340, 2002

    Japanese Society for Aquaculture Science

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