Histological survey of Gonad Male Blue Swimming Crab Portunus segnis in eastern coasts of Khuzestan province

The present study was aimed to investigate the histological structure of male gonad as an important organ of the reproduction and survival in the blue swimming crab Portunus segnis in Persian Gulf. In this regard, 20 blue swimming crab caught from the coasts of Hendijan in Khuzestan Province from September to June,2016. After anesthesia and morphological examination, samples were examined using common histological method. Based on the results, testis was surrounded by connective tissue.The connective tissue lamellae are divided testicular parenchyma into a number of specific lobules. Testis lobules have a Germinal Zone and a Transformation Zone. Vas deferens has three anterior, medial and posterior portions. The three portions surrounded externally by connective tissue and internally by cuboidal and culomnar epithelium. Spermatophores are observed in all three portions of vas deferens.