Production Performance of Sangkuriang Catfish (Clarias gariepinus Burchell-1822) N-2 (Nursery-2) Cultured on Recirculation System with Different Filter Media

Sangkuriang catfish (Claris gariepinus Burchell-1822) is one type of freshwater fish that has been widely cultivated in the community. This study was to investigate the production performance of sangkuriang catfish N-2 (nursery-2) cultured on recirculation system witch different filter media. The test fish used were 17 days old with a density of 7,000/2 m³ each with a 20-day maintenance time. This research was conducted using an experimental method and a complete randomized design consisting of 3 treatments and 3 replications. The treatments are P1 (Kaldnes 100%), P2 (Kaldnes 50% and Bioball 50%) and P3 (Bioball 100%). The data observed included growth (SGR,%/day) survival rate (SR,%), production (fish), Feed Convertion Ratio (FCR), and water quality. Growth performance was carried out by linear regression test. The results showed that the performance of SGR, SR and production were the highest in P1. With the respective values as follows; The regression test results in absolute weight were Y1 = 0.060 + (-0.121)x and the value of r2 = 0.921 with a weight of 1.29 ± 0.02 gram, while at absolute length were Y1 = 0.176 + 1.480x and r2 = 0.988 with length 3.87 ± 0.15cm, SGR of 15.86 ± 0.55% / day, SR of 97.85 ± 0.74% and seed production of 6849 ± 51.73 fish. The result of Volumetric TAN removal rate (g/m³/day) at P1 is higher with a value of 1.19 ± 0.39, compared to P2 and P3 which have a lower value of 1.11 ± 0.19 and 0, 81 ± 0.16 g/m³/day.