长毛对虾精子的发生过程

Abstract

于1989-1994年每年4-5月，在福建省漳浦县海区采集长毛对虾，以雄虾精巢为材料，应用光镜和电镜技术研究长毛对虾的精子发生情况。结果表明，长毛对虾精子的发生可划分为精原细胞、初级精母细胞、次级精母细胞、精子细胞及精子5个阶段。精原细胞染色质呈团块状分布在核内膜，胞质电子密度低，呈嗜酸性，细胞紧密排列在一起；初级精母细胞核糖体密度高，胞质呈现嗜碱性；次级精母细胞经历减数分裂变化；精子细胞变态过程主要表现在顶体的形成，顶体由粗糙型内质网演变形成；成熟精子由圆球状的主体部和钉子状的棘突部组成，核染色质属非浓缩型，呈絮状弥散分布于核内，精子全长约为7μM。

Using light and electron Ancroscopy, with testicular as the experimenta marerial, the spermatogenesis in the shrimp (penaeus penicillatus) which was caught in the sea during April-May from 1989-1994, reared in aquaculbe farm temporally, has been studied.The result shows that the spermbogenesis in p penicillatus includes five stages: spermatogonium, primary spermatheyte,secondap spermatocyte, spermahd and spermatozoon.At the stage of spermatogonium, the chromatin looks like bulk, dispersed along the inner nuclear membrane.The cytoplasm is low in electron density and is acidophilic.The spermatogonia are hghtly arranged each other.The primary spermatocyto has a lot of ribosomes and the cytoplasm is basophilic.At the stage of secondary spermatocyte, meiosis occurs in the nucleus.The formation of the acrosome is a main event in the metomorphosis of the spermatid.The acrosome is evolved from rough entoplasmic reticulum (RER).The matur sperm is composed of ball-like spherical body and nail-like spike.The dispersive chromatin is unconcentrated.The length of the sperm is about 7μm.