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The waste from Tilapia culture in Floating Net Cage (KJA) is suspected to be a cause of pollution in the reservoir. One alternative replacement is biofloc technology which has water efficiently and environmentally friendly. A field study on tilapia aquaculture has been carried out with a biofloc and KJA system to determine its productivity performance. The fingerling size of tilapia 10-20 g were maintained for 90 days with stocking densities of 6-80 individual/m 3 . Then, 30 fish were carried out for biofloc technology and 27 fish were carried out for KJA. The biofloc technology experiment was carried out in circular ponds with volume sizes of 10 and 20 m3 using probiotic bacteria. While in KJA system, the size of net cage were 172, 368, and 1800 m 3 . Fish were fed with commercial pellets of 5-10% biomass weights per day. The performance of biofloc technology experiment for tilapia culture were 14.81 ± 3.79 kg/m 3  (productivity), 72.94 ± 8.17% (survival), 80.66 ± 11.92% (feed efficiency), 3.20 ± 0.63 g/day (ADG), and 16.353 ± 1.017 IDR/kg (production cost). While the performance of KJA technology experiment for tilapia culture were 1.72 ± 0.67 kg/m 3  (productivity), 61.94 ± 12.78% (survival), 73.90 ± 7.62% (feed efficiency), 2.32 ± 0.40 g/day (ADG), and 16.168 ± 1.283 IDR/kg (production cost).

iop conference series. earth and environmental science

The performance of tilapia culture in biofloc technology (BFT) and floating net cage (KJA) systems as a candidate for the next tilapia culture in Indonesia