Nutritional properties of kutum, Rutilus frisii kutum (Kamensky), silver carp, Hypophthalmichthys molitrix (Val.), and rainbow trout, Oncorhynchus mykiss (Walbaum), correlated with body weight

The correlation of proximate composition and fatty acid content of the meat of brackish-water kutum, Rutilusfrisii kutum (Kamensky), warm-water silver carp, Hypophthalmichthys molitrix (Val.), and cold-water rainbow trout, Oncorhynchus mykiss (Walbaum) were determined in relation to body weight. In silver carp, body protein increased (r = 0.574, P = 0.032) with increased body weight while moisture decreased (r = -0.789, P = 0.000). In kutum and rainbow trout the contents of protein and lipid were independent of fish size (P > 0.05). The n-3 polyunsaturated fatty acids of silver carp meat increased with body weight (r = 0.592, P = 0.033), while n-6 fatty acids decreased (r =-0.667, P = 0.013). The results indicated the important advantages of the nutritional quality of fish of different sizes in the human diet.