史氏鲟精子入卵过程的扫描电镜观察

史氏鲟(Acipenserschrencki)隶属鲟形目(Acipenseriformes)、鲟科(Acipenseridae)、鲟属(Acipenser),是黑龙江特产和重要的经济鱼类之一,为淡水定居种类。鲟鱼是古老的生物类型,世界上约有28种,仅分布于北半球。由于自然环境的改变和人类活动的影响,所有鲟鱼均处于不同程度的濒危状态,有的已近灭绝1,2]。我国有8种鲟鱼,其中黑龙江2种,即史氏鲟和达氏鳇。近年来,随着人工养殖技术的提高和完善,史氏鲟成为国内最主要的鲟鱼养殖种类。有关史氏鲟人工养殖、基因组DNA含量、胚胎发育等国内有较多研究,而对受精生物学方面研究尚未见报道。特殊…

Scanning electron microscopic observation on spermpenetration of Acipenser schrenckii

The observation indicates the head length of sperm 6. 5..m, the top of broad-head 1..m, the lower part of head 1..m, neck 0. 5..m and tail length 16..m under scanning electron micro scope ( SEM) . The sperm.. s tail has axle and two wings. There are 6- 9 micropyles on the animal pole of the mature egg of Acipenser schrenckii , all of which are able to accept sperm. The micropyle.. s outer diameter is 18..m and inner 6..m. There are micropyle cells f illing in micropyle. The micropyle cells disappear after fert ilization 10s. The micropyles are sealed with membrane after sperms penetrating. The fertilization is got through about in two minutes. The sperms not penetrating egg are blocked on the way. Amur sturgeon.. s sperm and mature egg are different from those of other sturgeons.