Seacage culture of sex-reversed tilapia hybrid in Northern Samar [Philippines]
1992
Salvador, R.C. | Salvador, A.A. | Bacalando, N.Y. (Eastern Philippines Univ., University Town, Northern Samar (Philippines))
The feasibility of culturing the tilapia F1 hybrid (Oreochromis niloticus female x Oreochromis mossambicus male) in seacages was studied in Northern Samar, one of the coastal provinces in the Eastern Visayas region of the Philippines. The experiment consisted of the three phases: breeding and sex reversal, nursery rearing and grow-out. Water salinity was 1 ppt during the breeding and sex-reversal phase, 1 to 5 ppt during the nursery rearing period and 33-34 ppt in the grow-out phase. Sex-reversal and nursery rearing of the fry were done in 1.5 x 3. x 0.75 m polyethylene tanks. In the grow-out period, the fish were reared in floating net cages at two blocking densities, 50 pcs/sq.m. and 100 pcs/sq.m., with three replicates each. The duration of the grow-out phase was 173 days. Statistical analysis showed that specific growth rate, survival and production data did not differ significantly between treatments. However, simple cost and return analysis showed an increasing profitability with increase in the number of cages, stocking density, and number of cropping cycles per year. Studies to determine the most profitable stocking densities and the feed requirements of the tilapia hybrid cultured in seacages are recommended.
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