Performance Of Maintaining Brood Stock of Clarias gariepinus With Different Densities

Abstract

African catfish is a type of fish that is favored by Indonesian people. In the cultivation, availability of broodstock determines the success rate of production. A well-managed of broodstock will produce high productivity. Productivity is measured from the time interval of broodstock required to produce eggs after spawning, the fecundity and hatching rate. The density of broodstock will affect on productivity. This study aims to determine the right broodstock density in order produce eggs continously. The main container used is a cement tank with dimensions of 1 × 1 m2 and 1,2 m depth. The broodstock were reared in a recirculating system with stocking densities of 5, 10 and 15 fish/m2. Each treatment was repeated in 3 times. During maintenance, the number of broodstock was fed with floating pellets at 3% per day with the provision of 2 times every day. The results of water quality measurements as supporting data include temperature, pH, ammonia, nitrite and nitrate. Productivity was measured during 3 months of rearing to determine the egg production cycle. The productivity of broodstock with a stocking density of 15 fish/m2 resulted in a faster gonadal maturity level. However, the resulting fecundity, Fertilization Rate and Hatching Rate were better at the number of stocking 10 and 5 fish/m2.