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Abstract
This is for the first time in Viet Nam, a study on reproductive biology of golden trevally (Gnathanodon speciosus) was conducted. The present study was focused on testis biology of the fish. The male broodstock with body weith and total length were 400-800 g and 30-44 cm, respectively. Fish were kept in seacage and daily fed with trashfish at 3-5% body weight. Testis were collected for biological parameters. The results indicated that the GSI increased from June to September (3.3% ± 0.6%). Maturation of male fish increased from May to September. Male golden trevally are multiple spawners. There are different stages of germcell development in the testis at the same time. The biochemical composition changed based on the stages of testis maturation. Protein and lipid contents in mature testis were found higher than that in immature testis.
Keywords: Testis, golden trevally, Gnathanodon speciosus, GSI, biocehmical composition