Different substrate of trickling filter on growth, survival rate, and water quality of common carp (Cyprinus carpio) cultivation by using an intensive recirculation system

Recirculation aquaculture system is a culture technique which water conserve and reduce the waste discharge into aquatic environment. Trickling filter is the one of filter that common used for close system. Many kinds of substrate are able to use as a trickling filter to reduce the waste from aquaculture activity. The experiment aims to examine the effectivity of different substrate on growth, survival, and water quality of common carp. The different substrate as a treatment namely A) bio ball, B) bamboo, and C) gravel stone. The result showed that common carp cultured at A and B treatments on specific growth length (1.35±0.01 and 1.36±0.02%), specific growth weight (2.09±0.020 and 2.05±0.018%), and survival rate (86.67±2.44 and 87.89±1.83%) were higher than that of C treatment (0.81±0.03%, 1.74±0.075%, and 79.69±1.67%) (P<0.05). The biomass of common carp at A and B treatments (961.6±46.60 and 948.83±40.84 g) were higher than that of C treatment (716.17±38.23 g). Nitrite, nitrate, total ammonia, and phosphate at A and B treatments were higher compare to C treatment in term of removal efficiency (P<0.05). Bamboo has a potential as a substrate for trickling filter in an intensive culture using recirculating aquaculture system.