Effects of replacing fish meal with canola meal on growth and body composition of white leg shrimp (Litopenaeus vannamei) stages of growth

The effect of different levels of canola meal on growth indices¡ body composition and survival rate of white leg shrimp (average weight 1.63 ± 0.09 gr) was studied. The experiment was according to completely random design with five dietary treatments (0¡ 5¡ 15¡ 25 and 35 percent of canola meal) in triplicate groups. Four hundred and fifty shrimp were randomly distributed between 15 tanks of 300 L capacity (30 shrimp per tank). Shrimps were fed three times a day according to their body weight at a temperature of 31 ± 0.09 °C for 8 weeks. After 8 weeks of feeding¡ growth and nutritional indices such as weight gain (WG)¡ specific growth rate (SGR)¡ protein efficiency ratio (PER)¡ feed efficiency (FE)¡ average daily weight gain (ADG)¡ percent of body weight increase (BWI)¡ percent of protein production (PPV) survival rate¡ price index were measured. Results showed that replacing canola meal by fishmeal in the diet of white leg shrimp have not any negative impact on shrimp growth performances up to 25 percent. There is no significant differences were observed in body composition and survival rate between treatments. Results of this study showed that fish meal can be replaced by canola meal up to 25 % and reliable price index in the diet of juveniles shrimp.