Gonadal Maturity Level and Index of Goby Tank Fish (Glossogobius Giuris) in the Waters of Lake Sidenreng, South Sulawesi

Bungo fish is a valuable freshwater species with significant economic worth. The villagers consume the fish either fresh or dry. This study aims to look into the reproductive biology of Glossogobius giuris bungo fish (Buchanan, 1882) in Sidenreng Lake, Sidenreng Rappang Regency, South Sulawesi. It comprises the sex ratio, gonadal maturity level (GML), gonadal maturity index (GKI), and the first mature gonad size. The research effort was carried out over the months of September, October, and November in the year 2022. Five sites that represented reservoir waters provided fish samples. The catches of nearby fishermen were also collected. Fish samples were described at Makassar's Fisheries Biology Laboratory, Department of Fisheries, Faculty of Marine and Fisheries Sciences, Hasanuddin University. It included 235 fish samples in all, 163 of which were male and 72 of which were female. The study's findings indicate that there is a 2.59:1 sex ratio between male and female fish. The continuity between male and female fish is depicted by this ratio. Male and female bungo fish have four gonadal maturity levels (GMLs): GML I, II, III, and IV. The value of the gonad maturity index was 12.59% greater in female fish (3.63%) than in male fish. Male gonads mature at 327.07 mm, while female bungo fish mature at 227.36 mm. This reveals that male fish mature faster than females.