在强化培育下草、鲢、鳙鱼一年两次产卵的初步研究

A PRELIMINARY STUDY ON THE PHENOMENON OF SPAWNING TWICE A YEAR IN THE GRASS CARP, SILVER CARP AND BIG HEAD UNDER THE CONDITION OF STRENGTHENED CULTIVATION

  • 摘要: 本文总结了高州水库多年来在强化培育下草、鲢、鳙鱼一年二次产卵的生产实践经验,并从卵巢发育的细胞形态学和组织学进行了初步研究后指出:在这几类家鱼第一次刚产卵后的卵巢中可以观察到第Ⅱ、Ⅲ、Ⅳ时相卵母细胞同时并存,其中可以明显地看到处于早、中、晚期的第Ⅲ时相卵母细胞,它们在亲鱼强化培育下可以当年发育成第Ⅳ时相卵母细胞;如果对产后的亲鱼不进行强化培育,卵巢将退化至第Ⅱ期。家鱼卵巢中卵母细胞发育的非同步性,是获得一年多次产卵的内在因素。

     

    Abstract: This paper summarizes the authors' practical experiences for years on making the Grass Carp (Ctenopharyngodon idellus), Silver Carp (Hypophthalmichthys molitrix) and Bighead (Aristichthys nobilis) to spawn twice a year under the condition of strengthened cultivation. A preliminary cyto-morphological and histological study of ovarian development demonstrates that immediately after the first spawning of the pond-cultured fishes, oocytes of Phase Ⅱ, Phase Ⅲ and a small number of residual Phase Ⅳ oocytes can be seen to coexist simultaneously. Furthermore, the early, middle, and advanced stages of Phase Ⅲ oocytes can be clearly distinguished. From these observations the authors come to the conclusion that Phase Ⅲ oocytes can develop into Phase Ⅳ oocytes in the same year under the condition of strengthened cultivation of the spawners. If the spent spawners are cultivated in an ordinary way without strengthening, their ovaries will degenerate into Stage Ⅱ. Thus the non-synchronous development of the oocytes in the ovaries of these fishes is the intrinsic factor which accounts for the success of a second or even a third induced spawning within the year.

     

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