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本文对黄、渤海小黄鱼精巢的结构类型、精子形成及其季节变化作了组织学的观察。 1.精巢内部是由许多不规则大小的精囊壶腹构成,精巢外部系由致密的纤维结缔组织膜所覆盖。 2.小黄鱼精子的形成分为五个期:精原细胞(Ⅰ期);初级精母细胞(Ⅱ期);次级精母 相似文献
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Observations on gonad development of 84 species of marine fishes in Jiaozhou Bay waters showed the breeding periods of more than 50 of these species are mostly from April to August, with peaks between May to June. A great many of the species spawn in the warm season, only a few species in the cold season. The number of spawning species increases with the rise and decreases with the fall in water temperature. The absolute fecundity of 50 teleost species, which usually increases with body length and weight, was estimated to range from about 300 to 9,000,000 eggs. The reproductive patterns of fishes in Jiaozhou Bay waters are discussed. 相似文献
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