Supplementation of methionine in low fish meal diets of nile tilapia (Oreochromis niloticus)
2011
Tawat Takool(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Aquaculture) | Orapint Jintasataporn(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Aquaculture) | Prathak Tabthipwon(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Aquaculture) | Chatchai Thaitungchin(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Aquaculture)
Supplemental methionine in low fishmeal diets of Nile tilapia (Oreochromis niloticus) was conducted by adding 0, 0.25 and 0.55 percent methionine in 3 percent fishmeal diets. Fish with average weight of 137.4 g, were stocked in 1,000 liter fiber tanks at the density of 10 fishes per tank and fed at 3 percent of body weight per day for 12 weeks. The results indicate no statistical differences on growth performance, feed conversion ratio(FCR), protein efficiency ratio(PER), survival rate and feed cost, but weight gain and average daily gain of tilapia fed diet supplemental 0.55 percent methionine tended to be higher (p=0.06) than the other groups. Blood protein, Immunoglobulin (IgM), and glycogen have no statistical different. Blood glucose of tilapia fed diet supplemental 0.55 percent methionine is significant higher (p LT 0.05) than the other groups. Percentage of fillet of tilapia fed diet supplemental methionine 0.25 percent (39.36 percent) and 0.55 percent ( 39.68 percent) are significant higher (p LT 0.05) than group of tilapia fed diet supplemental methionine 0 percent (36.81 percent). Therefore, supplemental methionine 0.25-0.55 percent in 3 percent fishmeal diets is significant enhance growth performance (p=0.06) and increase percentage of tilapia fillet (p LT 0.05).
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