カマキリ人工養成魚における残留卵の出現と成熟への影響

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タイトル別名
  • Appearance of Residual Eggs and Effects on Ovarian Maturation in the Cultured Broodstocks of Fourspine Sculpin <I>Cottus kazika</I>
  • カマキリ ジンコウ ヨウセイギョ ニ オケル ザンリュウラン ノ シュツゲン ト セイジュク エノ エイキョウ

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Ovaries of cultured broodstocks (2 years old) of fourspine sculpin, Cottus kazika, were monitored by external and histological observations throughout the year. Ovarian maturity was classified into 6 stages according to the characteristics of the oocyte development, the ovarian regression, and the residual eggs. Almost all broodstocks contained residual eggs in ovary throughout the year, although the appearance of residual eggs decreased during the spawning season (January-March). The appearance of residual eggs in broodstocks was due to non-ejection of the residual eggs from the ovulated fish and a slowly progressed of ovarian regression during the resting stage. Although eggs with high fertility were obtained from broodstocks which retained the residual eggs in the ovary during non-spawning period, it was not clear that maintaining residual eggs in ovarian cavity for a long term have an effect on the following maturation and ovulation.

収録刊行物

  • 水産増殖

    水産増殖 56 (1), 37-43, 2008

    日本水産増殖学会

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