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Effect of stocking density on growth, production and survival of red tilapia ( Oreochromis mossambicus × O. niloticus ) were conducted in hapa for 60 days at Chilya Thatta. Tilapia fry (4.5±0.02 cm, 2.0±0.01 g) were stocked into hapa (4.5x2.4x1 m). Three treatments with two replicates were used: T 1 -200; T 2 -250 and T 3 -300 fry/ hapa . Fry were fed twice a daily with pelleted feed containing 35% protein, 5% of total biomass. After 60 days, the highest growth were determined in T 1 (49.8±0.0 g) while in T 3 lowest growth (29.09±0.0 g) was recorded. Production (9.56, 10.13 and 8.12 kg/m 3 /60days) in T 1 , T 2 and T 3 respectively were significantly different ( P 0.05). Survival was significantly different among treatments ( P <0.01). Highest survival (100%) was attained in T 1 with lower stocking density, followed by T 2 (98%) and T 3 (95%). Water quality parameters recorded throughout the study period were found within the ranges for fish culture such as temperature 27.2 to 28.5 °C, dissolved oxygen 5.8 to 6.4 mg/l, pH 6.9 to 7.6, ammonia from 0.45 to 0.51 mg/l, hardness 106 to 110 ppm and nitrite 0.151 to 0.162 mg/l.

Effect of stocking densities on growth, production and survival rate of red tilapia in hapa at fish hatchery Chilya Thatta, Sindh, Pakistan