Structure of the Testis of the Goby Glossogobius olivaceus

The structure of the testis of the goby Glossogobius olivaceus was histologically studied. The testis was a small elongate organ and was semicircular or reverse triangle in shape in cross section. The testis was composed of two main parts; peripheral seminiferous region and central large glandular region. Seminiferous region was mainly composed of seminiferous lobules. The cyst of germ cells covered the inner wall of the seminiferous lobules. The cyst cells were thin and round in shape. 3ƒÀ-HSD activity was detected only in the glandular cells, but not in the seminiferous lobules. Glandular cells had well developed smooth surfaced endoplasmic reticulum and mito chondria with many tubular cristae. The glandular cells are considered to be homologous with the Leydig cells of other vertebrates.