Effect of Dietary Tryptophan on Maturation of Ayu Plecoglossus altivelis

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Two preliminary rearing experiments were conducted to investigate the effects oforal doses of tryp-tophan on fish maturation. Young ayu born in Lake Biwa were used as the experimental fish. In 1991, the experiment was started one month before the usual spawning season using ayu with gonadosomatic index (GSI) of 8.0% in male and 9.0% of female, but in 1992 entirely immature ayu with GSI below than 0.1% in both sexes were used. They were fed three different test diets: i.e., 0.1% tryptophan (TRP), 0.1% p-chlorophenylalanine (PCPA; depleter of serotonin) dietor control. In the group fed the diet containing TRP, the peak of serum testosterone level and timing of spermiation were advanced in males and the final maturation for females was accelerated. Whereas, in ayu fed the diet with PCPA, suppression of serum testosterone levels and the delay in the timing of spermiation were noted in males, and in females lowering of serum estradiol-17β and the delay in the final maturation were observed. Thus, it is estimated that dietary TRP is involved in the maturation, being intermediated by serotonin. Moreover, these findings indicate the possibility that fish maturation can be controlled by not only injection or implanting of sexual hormones but also by oral administrationof TRP, one of essential amino acid in fish.

収録刊行物

  • Fisheries science : FS  

    Fisheries science : FS 62(5), 776-782, 1996 

    公益社団法人 日本水産学会

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各種コード

  • NII論文ID(NAID)
    10004867580
  • NII書誌ID(NCID)
    AA10993718
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09199268
  • NDL 記事登録ID
    4060761
  • NDL 雑誌分類
    ZR26(科学技術--農林水産--水産)
  • NDL 請求記号
    Z54-H592
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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