Effect of various lipid sources on growth, survival, and feed conversion ratio of tilapia hybrid fry (Oreochromis niloticus x O. mossambicus)
1994
Atmini, S. (Philippines Univ. in the Visayas, Leganes, Iloilo (Philippines). Coll. of Fisheries)
An 8-week feeding trial was conducted to determine the effects of various lipid sources on growth, survival and feed conversion ratio of tilapia hybrid for Oreochromis niloticus x O. mossambicus under brackishwater rearing conditions (20-25 ppt). Six diets (14 or 23 percent crude fat, 30 percent protein, 4,293 to 4,775 kcal/kg) were used. After a 5-week conditioning, fish (0.84+ .38 g; 3.31 + 0.59 cm TL) were stocked in 200 liter brackishwater at 50 individuals/tank. Twenty-one 300 liter conical fiberglass tanks attached to recirculating water system (0.5-1.0 liter/min flow rate) were used. Fish were fed diets containing either 3 percent cod liver, 10 percent cod liver, 10 percent soya oil, 10 percent corn oil, 10 percent coconut oil, or 10 percent sesame oil. Feeding rate was adjusted weekly at a daily feeding frequency of four times. Among the treatments, feeding 10 percent cod liver resulted in the highest mean body weight (13.16 g), followed by fish fed coconut oil (12.54 g), sesame oil and 3 percent cod liver oil (12.09 g), 10 percent corn oil (11.78 g), 10 percent olive oil (10.35 g), and sesame oil (9.65 g). Survival and FCR [feed conversion in ratio] ranged from 92.67 to 98 percent and 1.78 to 2.11, respectively. Weight gain, survival rate, and FCR were not significantly different among treatment means (P-0.05)
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