斑节对虾精子发生的超微结构

斑节对虾精子发生划分为精原细胞、初级精母细胞、次级精母细胞、精子细胞和精子五个阶段。精子发生中，从精原细胞到精子，染色质经历了从以异染色质为主变为高度凝聚态，再经解聚为弥散絮状的变化过程。同时，核从具有完整核膜变为核膜不完整。成熟的的精子含有核仁。顶体由高尔基囊泡逐渐演化而成，并向外伸长成为棘突。这是斑节对虾精子发生的主要特征。

ULTRASTRUCTURE OF SPERMATOGENESIS IN THE SHRIMP PENAEUS MONODON

By the use of light and electron microscopy,spermatogenesis in the shrimp Penaeus monodon was investigated.The results showed that spermatogenesis in P.monodon could be divided into five stages:spermatogonium,primary spermatocyte,secondary spermatocyte,spermatid and spermatozoon.During spermatogenesis,chromatins undergo much change.First,a lot of heterochromatins are spread in the nucleus at the stages of spermatogonium and spermatocytes;then,chromatins become highly coacervative at the stage of spermatid;third,the chromatins lose condensation and look like flocculus at the stage of spermatozoon.During the stages of spermatogonium and spermatocytes,the nuclear membrane is integrated,and it becomes unintegrated at the stage of spermatozoon.These is a nucleolus in the nucleus of mature sperm.The acrosome is derived from Golgi vesicles and protrudes outward to form the spike.These are the main characteristics of spermatogenesis in P.monodon.