Some Aspects of Spermatogenesis and Spermatology in Teleost Fish

Abstract

Spermatogenesis in teleost fish has several original features not found in mammals. The wide diversity in testicular structure and spermatogenetic function in teleosts may be related to the large number of species and the wide differences in colonized biotopes. However, all the lower vertebrates and many groups of invertebrates have one peculiarity in common, i.e. the presence of cysts composed of aggregates of isogenic cells that develop synchronously. Moreover, all the germinal cells are included in Sertoli cells so that they are never in direct contact with the basal lamina of the seminiferous tubule.