Histology of the Testis Development in Macrobrachium asperulum

Histology of the testis development of M. asperulum has been studied with light microscopy. According to the quantity and forming sequence of spermatogenetic cells, and the shape and structural characters of testis, the development of the testis can be classified into five stages: spermatogonium phase, spermatocyte phase, spermatid phase, mature sperm phase and deteriorated phase. The testis at spermatogonium phase is small and transparent, and the spermatogenetic cells in seminiferous tubule primarily consist of spermatogonia; The testis at spermatocyte phase develops, and is translucent, and the spermatogenetic cells in seminiferous tubule are primarily composed of primary spermatocytes and secondary spermatocytes. The testis at spermatid phase develops continually, and is deep in color, and the spermatogenetic cells in seminiferous tubule are primarily composed of spermatids. The testis at mature sperm phase get to the biggest in volume, and is purple, and the spermatogenetic cells in seminiferous tubule are almost composed of mature sperms. The testis at deteriorated phase reduces in volume, and is translucent, and the mature sperms in seminiferous tubule have almost been extruded.