Optimum Stocking Density of Nursing Sex Reversal Nile Tilapia (Oreochromis niloticus) in Hapa with Aeration to Reach at Least 30 gram Size (Oreochromis niloticus) in Hapa with Aeration to Reach at Least 30 gram Size

Optimum stocking density of nursing sex reversal Nile tilapia ( Oreochromis niloticus ) in hapa with aeration to reach at least 30 gram size was studied. Experiment was conducted by using 1-m 3 hapa hung in 300-m 2 earthen pond. Fives stocking densities of 100, 150, 200, 250 and 300 fish/m 3 , respectively were tested. Fish was fed with commercial feed to an apparent satiation by three times a day using 40%P feed for first 30 days and 30%P feed for last 30 days. Culture period made fish nursed with all stocking density reached average weight  at least 30 grams, was shown as 60 days. Non – significant  differences of final weight and length, also       specific growth rate were observed between fish nursed with stocking densities of 100 and 150 fish/m 3 ( p>0.05 ), but higher than those of fish nursed with other stocking densities ( p 0.05 ). Nursing with stocking density of 100 fish/m 3 made fish grew to at least 30 grams with the fastest times of 45 days and yielded higher percentage of at least 30 gram size than fish nursed with other stocking densities ( p<0.01 ). Therefore, stocking density of 100 fish/m 3 was optimum for nursing sex reversal Nile tilapia to reach at least 30 gram size in terms of saving time and productivity. Keywords : stocking density, sex reversal Nile tilapia, hapa,  seration