REPRODUCTIVE BIOLOGY OF JAVAEAN BARB (Systomus rubripinnis VALENCIENNES, 1842) IN THE BODO RIVER, CENTRAL JAVA AS THE BASIS FOR INLAND FISHERIES MANAGEMENT

Abstract

The Javaean barb, an indigenous freshwater fish species belonging to the family Cyprinidae, was the focus of a reproductive biology study conducted in the Bodo River, Kebumen Regency, Central Java. This research aimed to elucidate the species' reproductive characteristics as a foundation for inland fisheries management. Sampling was performed using purposive random techniques, with data analyzed both descriptively and quantitatively over a period spanning February to December 2023. The observed sex ratio in December is more optimal, with a value of 0.94:1 or 85 male fish and 90 female fish. The dominant size distribution or the highest peak size distribution is dominated by young fish (less than 13.6 cm). Gonadal maturity stages (TKG) were predominantly identified at stages I, II, and III. The highest gonadosomatic index (GSI) was recorded in December, with males exhibiting a lower value (0.51%) than females (4.27%). Fecundity ranged from 1953 to 4652 eggs peaked in December. The length at first gonadal maturity was smaller in males (13.69 cm) than in females (16.33 cm). These findings indicate that the Javaean barb in the Bodo River possesses strong reproductive potential and consistent gonadal development, supporting its viability as a biological basis for inland fisheries management.