Abstract
One of the technologies that can produce a high number of fish in limited land and water is biofloc. Adapting biofloc technology in Indonesia from laboratory to industrial scale requires several improvements. This study aims to optimize biofloc technology and to reduce production costs. A series of research activities to increase the productivity of tilapia by biofloc technology have been carried out using superior seeds variety, proper application of stocking densities, type and volume of tank/pond, and the seed size at the stocking. Feed efficiency, productivity, survival rate, specific growth rate, and economic parameters were observed. Using tilapia superior seed can increase biomass by 4% compared to Nirwana II tilapia variety. The best seed density that can be used is 75-80 fish/m3, it is related to the appropriate type or volume of the round tank, which is 10 m3. The correlation value (R2) between the size of the initial seed and the observed parameters were 0.9439 (specific weight gain rate); 0.5841 (feed efficiency); 0.4880 (productivity) and 0.4789 (survival rate). Optimization of biofloc technology can save production costs up to 38.41 %. The value of the R/C ratio is 2.03.
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