Assembling the superior biofloc tilapia strains for industry

The decreasing productivity and increasing environmental pressure on intensive tilapia culture in open waters, especially floating net cages, have forced the development of a biofloc system for farming. This study aimed to develop superior strain suitable observe their economic profitability under commercial scale system. selective breeding activity was carried out 100 families reared mated hapa (a double-walled contrivance which an inner hapa, made mosquito netting material, is installed within outer one whole cloth) pond three generations. individual selection conducted at age 6 months characters standard length body weight with best 10% top part population as reference formation next generation. After generations, offspring obtained from mass spawning were grown round-limen ponds square-concrete observations. results showed that heritability values 0.4196 (standard length, SL) 0.4898 (body weight, BW). average response BW SL 13.04% 6.11%, respectively. Biomass gain between 19.29–28.83 kg/m3. production multiply value 8.07-13.59x. daily growth 2.8g-3.0g. Benefit-Cost ratio valued 1.81 2.71. has moderate value. When it raised different volumes, significantly affects biomass, multiplication Also, advantageous when applied industrial scale.