Effect of dietary energy level on growth and carcass composition of Siamensis pangasius (pangasius macronema bleeker, 1851) in cage culture (Thai)

Abstract

This research studied the growth and carcass composition of Siamensis Pangasius (Pangasius macronema Bleeker) cultured in floating cages hung in a pond at Nongkhai Campus, Khonkaen University. Four different digestible energy diets of 250, 300, 350 and 400 Kcal./ 100 g. (three replicates each) were applied to fish with an average weight and length of 2.92 ± 1.087 g. and 7.13 ± 0.898 cm. in 1x1x1.5 m. cages at a stocking rate of 100 individuals/ cage. The result of this five month research indicates that the mean weight and length gain, average daily weight gain, specific growth rate, food conversion ratio and the survival rate were not significantly different (P>0.05). The carcass compositions in protein, lipid, moisture and ash of Siamensis Pangasius were significantly different (P<0.05). Protein level in carcass composition of fish fed with the diet of 250 kcal/100 g. was highest (P<0.05) and lipid level was lowest (P<0.05).