Soares et al., 1998. Acta Scient., 20 (3): 395-400
Farelo de canola na alimentacao de alevinos de carpa-capim (Ctenopharyngodon idella V.)
100 fry of mean weight 1.33 g and length 5.06 cm were equally distributed among twenty 50-litre aquaria. The fry were fed on diets in which soyabean meal (SM) protein was replaced by rapeseed meal (RM) protein. Five substitution levels of SM protein by RM protein (0, 20, 40, 60 and 80%) corresponding to a RM inclusion rate of 0, 8.04, 16.1, 24.1 and 32.15% were used. The diets were isonitrogenous and had equal levels of calcium and phosphorus, and were given for 28 days. Inclusion of rapeseed meal had no effect on weight gain, relative growth rate, protein efficiency ratio, feed conversion, survival rate and cost of diet/kg weight gain. There were quadratic effects of RM on final weight ( y = 2.39190 + 0.01327 x - 0.00019 x, r = 0.78), total length ( y = 6.15270 + 0.01195 x - 0.00016 x, r = 0.86) and total length increase ( y = 1.10340 + 0.01198 x - 0.00016 x, r = 0.86). It is concluded that an inclusion rate of 14.40% gave the best performance in grass carp fry.