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Abstract
Abstract
The aim of this study was to determine the effects of rearing density on growth, survival rate and food conversion ratio of juvenile giant trevally in seacages. Juvenile giant trevally (body weight of 4.8- 6.3 g; total length of 5.3-6.7 cm) were randomly assigned to nine hapas (2×2×2.5 m) fixed in seacages with three rearing densities, including 20; 25 và 30 individuals/m3. Each rearing density was run in triplicate hapas. The fish were fed ad libitum by hand with a commercial slow-sinking pellets (46% protein, 10% lipid, three times a day, for a period of 90 days. Results from the present experiment indicated that rearing density affected growth in body weight and body length, FCR and survival rate in giant travelly (P<0.05). Giant trevally reared at density of 30 individuals/m3 showed lower growth and survival rate, but higher FCR compared to other two rearing densities. Meanwhile, no significances in growth, FCR and survival rate were observed between the fish groups reared at 20 và 25 individuals/m3. These results indicate that an stocking density up to 25 individuals/m3 is suitable for seacage farming of the giant trevally.
Key words: Caranx ignobilis, rearing density, growth performance, survival rate