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

Abdul Malik  Daudpota; Illahi Bux  Kalhoro; Sajjad Ali  Shah; Hameeda  Kalhoro; Ghulam  Abbas

doi:10.17017/j.fish.88

Abdul Malik Daudpota Directorate of Fisheries Sindh, Livestock and Fisheries Department, Government of Sindh, Pakistan
Illahi Bux Kalhoro Department of Anatomy and Histology Faculty of Animal Husbandry and Veterinary Science, Sindh Agriculture University Tando Jam, Pakistan
Sajjad Ali Shah Directorate of Fisheries Sindh, Livestock and Fisheries Department, Government of Sindh, Pakistan
Hameeda Kalhoro Department of Fresh Water Biology and Fisheries, University of Sindh Jamshoro, Pakistan
Ghulam Abbas Centre of Excellence in Marine Biology, University of Karachi, Karachi-75270, Pakistan

Keywords: Stocking density, growth performance, survival, red tilapia, production, hapa

Abstract

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: T₁-200; T₂-250 and T₃-300 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 T₁ (49.8±0.0 g) while in T₃ lowest growth (29.09±0.0 g) was recorded. Production (9.56, 10.13 and 8.12 kg/m³/60days) in T₁, T₂ and T₃ respectively were significantly different (P<0.05) to each other. Feed conversion ratio of 0.48, 0.48 and 0.49 in T₁, T₂ and T₃, respectively not significantly different (P>0.05). Survival was significantly different among treatments (P<0.01). Highest survival (100%) was attained in T₁ with lower stocking density, followed by T₂ (98%) and T₃ (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.

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