The observation indicates the head length of sperm 6.5μm,the top of broad-head 1μm,the lower part of head 1μm,neck 0.5μm and tail length 16μm under scanning electron microscope (SEM).The sperm’s tail has axle an...The observation indicates the head length of sperm 6.5μm,the top of broad-head 1μm,the lower part of head 1μm,neck 0.5μm and tail length 16μm under scanning electron microscope (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 18μm and inner 6μm.There are micropyle cells filling in micropyle.The micropyle cells disappear after fertilization 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.展开更多
文摘The observation indicates the head length of sperm 6.5μm,the top of broad-head 1μm,the lower part of head 1μm,neck 0.5μm and tail length 16μm under scanning electron microscope (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 18μm and inner 6μm.There are micropyle cells filling in micropyle.The micropyle cells disappear after fertilization 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.
