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black eel
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  黑仔
     Sex may differentiate in European eel at the stage of glass eel become black eel, about 10.5 ~ 12.0cm in body length.
     欧洲缝纫性分化时间在白仔鳗缓转变为黑仔鳗时期,体长10.5~12.0cm。
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  相似匹配句对
     Black,M.
     Black,M.
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     Black, M.Scholes and R.
     Black,M.
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     An initial report on ecological culture of black fry of European eel
     欧鳗黑仔阶段生态养殖初报
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     Colour: steel black.
     钢灰色、粉末黑色。
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     Feed for European eel
     欧鳗(Anguilla anguilla)饲料
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Sex may differentiate in European eel at the stage of glass eel become black eel, about 10.5 ~ 12.0cm in body length. The observation of gonadal sections indicate that prlmitive oogonia in the female ovary and spermatogonia in the male testis are found at this stage. It in-dicates that sex differentiation in the European eel is earlier than that of Japanese eel. The re-sults of observation of gonadal sections. of slow growing eel collected from two eel farms in FuJian province indicate...

Sex may differentiate in European eel at the stage of glass eel become black eel, about 10.5 ~ 12.0cm in body length. The observation of gonadal sections indicate that prlmitive oogonia in the female ovary and spermatogonia in the male testis are found at this stage. It in-dicates that sex differentiation in the European eel is earlier than that of Japanese eel. The re-sults of observation of gonadal sections. of slow growing eel collected from two eel farms in FuJian province indicate that all slow growing eel,except specitic individuals,were male. It is pointed out that a cause of slow growing in Eeuropean eel may be realated with sex. Finally,the complex factor inducing slow growing of eel is discussed in this paper.

欧洲缝纫性分化时间在白仔鳗缓转变为黑仔鳗时期,体长10.5~12.0cm。性腺切片观察可见雌性卵巢中有原始卵原细胞,雄性生材小管中有精原细胞,性别分化明显早于日本鳗鲡。从福建省两个养鳗场采集僵鳗,取其性腺切片观察结果表明,除个别僵鳗外,全部为雄性,提示僵鳗成因可能与性别有关。文中讨论了发生僵鳗的复杂因素。

 
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