Effect of <I>Chlorella</I>-extract supplement on blood properties and body composition of ayu

DOI
  • NAKAGAWA H.
    <I>Faculty of Applied Biological Science, Hiroshima University</I>
  • KASAHARA S.
    <I>Faculty of Applied Biological Science, Hiroshima University</I>
  • UNO E.
    <I>Wakayama Prefecture Inland Water Fisheries Center</I>
  • MINAMI T.
    <I>Wakayama Prefecture Inland Water Fisheries Center</I>
  • AKIRA K.
    <I>Wakayama Prefecture Inland Water Fisheries Center</I>

Bibliographic Information

Other Title
  • 養殖アユの血液性状，体成分に及ぼすクロレラエキス添加飼料の効果

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Description

The determination of physiological merit of supplemental Chlorella-extract in ayu, Plecoglossus altivelis, was followed by the previous results that it endowed resistant power against disease.<BR>Ayu of body weight 46 g was fed on the composed feed with 4% of feed oil (control group) . Experimental groups, A and B were respectively fed 1 % and 2% of the Chlorella-extract to the above feed. The Chlorella-extract was prepared from Chlorella vulgaris E-25 with hot water for 1 hr, and 60% of sucrose were added as an antiseptic. After 42 days feeding blood properties and body composition were analysed.<BR>1) The extract-fed groups showed low fatness and gonadosomatic index, and high hepatosomatic index. The effect of retardation of sexual maturation was suggested by the Chlorella-extract feeding.<BR>2) The extract effectively deprerssed the lipid contents of the serum, dorsal muscle, and viscera.<BR>3) In order to compare the response to acute handling stress, fish were exposed to air (air-dipping) for 2 min before being returned to O2-saturated water. Time course of recovery was serologically monitored for a period of 20 min post-air-dipping. The extract-fed groups trended to be tolerant to the air-dipping, comparing with control group.<BR>4) The physiological effect of the Chlorella-extract was most probably associated with lipid metabolism.

Journal

  • Aquaculture Science

    Aquaculture Science 30 (4), 192-201, 1983

    Japanese Society for Aquaculture Science

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