The Effect of different Stocking Density on Ammonia Content (NH3) and Nitrite (NO2) in Catfish (Clarias Sp.) with Biofloc Aquaculture System

The accumulation of waste in aquaculture can cause inorganic toxins  named ammonia (NH3) and nitrite (NO2) in water. Biofloc technology is one of the new alternative to solve the problem of ammonia (NH3) and nitrite (NO2) in aquaculture techniques adapted from sewage treatment. This study aims to determine the effect of stocking density of catfish (Clarias sp.) using biofloc system against ammonia and nitrite. This study used an experimental method to completely randomized design (CRD). Statistical analysis using Analysis of Variant (ANOVA) to determine the effect of treatment.The results of the study showed that the effect of stocking density of catfish (Clarias sp.) were significantly different (P 0.05) to nitrite (NO2). The lowest average content of nitrite production (NO 2) was the PO treatment (stocking density 15 fishes/15 L) of 0.0358 ± 0.0028 and the highest was P3 treatment (stocking density 30 fishes/15 L) of 0.0388 ± 0.0042. During the culture. temperature was  26,4-29,70C, dissolved oxygen was 5.2 to 8.3 mg / L and pH between 7.01 to 8.66. Keywords : Biofloc, ammonia, nitrite