Weaning of seabass Lates calcarifer to artificial diet
1994
Juario, J.V. | Duray, M.N. | Fuchs, J. (Philippines Univ. in the Visayas, Leganes, Iloilo (Philippines). Coll. of Fisheries)
Fertilized egg from captive seabass broodstock reared in floating cages at SEAFDEC's [Southeast Asian Fisheries Development Center, Iloilo, Philippines] Igang substation were transported to the fish hatchery laboratory at the Tigbauan station. Newly-hatched larvae were stocked in 250 li cylindro-conical fiberglass tanks with seven treatments replicated twice. From day 1 to 30, experimental groups were either abruptly or gradually weaned to prepared diets while the control were fed live food consisting of rotifers and brine shrimp nauplii. On day 30, most metamorphosed larvae (fry) were stocked into 500 li circular fiberglass tanks at 1 fry/l and reared for another 30 days by using Selco-enriched Artemia for the control and artificial diet for the experimental groups. Results indicate that seabass larvae could be weaned to artificial diet either abruptly or gradually starting as early as day 10. Better survival rates up to day 30 are obtained if larvae are fed live food or gradually weaned to artificial diet starting on day 10, 15, and 20, rather than when they are abruptly weaned to artificial diets starting on the same days. Increase in length and weight of seabass larvae up to day 30 is significantly better if they are fed live food or if they are weaned either abruptly or gradually to artificial diet starting day 20. After day 30, a high survival rate is obtained if seabass fry are reared on live food up to day 60; cannibalism is also very much reduced. Good survival rates are obtained and a moderately low incidence of cannibalism occurs if seabass fry previously weaned, either abruptly or gradually, to artificial diets starting on day 20 are reared or artificial diet up to day 60. Low survival rates are obtained and high incidence of cannibalism occurs if seabass fry that were previously weaned to artificial diets, either abruptly or gradually, starting on day 10 and 15 are reared on artificial diets up to day 60
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