Optimization of feeding frequency of Asian seabass (Lates calcarifer) fry reared in net cages under brackishwater environment

Abstract An experiment was conducted in brackishwater environment to determine the optimal feeding frequency for growth, effective feed conversion, survival, shooters emergence and size variation in Asian seabass fry reared in the net cages. Four feeding frequencies of one (T1), two (T2), three (T3) and four (T4) times a day were evaluated as treatments in triplicate for a period of 5 weeks. Hatchery produced weaned seabass fry (25.9 ± 0.3 mm/203.8 ± 4.6 mg size) stocked at 120 numbers per cage were fed with a commercial marine fish larval diet containing 55% crude protein at 10% of the biomass daily for the first 3 weeks, followed by 8% for the remaining 2 weeks. Although, the highest growth was recorded in T3, the final length (45.9 ± 0.3 mm) and weight (1203.8 ± 4.6 mg) did not differ significantly ( P  > 0.05) from that of T4. Whereas, fish with one or two times feeding exhibited significantly lower growth ( P P P  > 0.05) between T3 and T4. Significantly higher survival of 75.89 ± 4.17% was recorded in T3 than those of one and two times fed fish ( P P

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