Efficacy of modified canola oil to replace fish oil in practical diets of Pacific white shrimp Litopenaeus vannamei

摘要

Current study was conducted to evaluate the efficacy of modified canola oil (MCO) with enhanced levels of omega 3 fatty acids, to replace menhaden fish oil (MFO) in practical diets (36% protein and 8% lipid) of Litopenaeus vannamei. In first two trials, the basal diet containing 100% MFO was incrementally replaced by 25%, 50%, 75% and 100% MCO, which clearly demonstrated the potential of using MCO as a replacement for up to 75% of the supplemented MFO in poultry meal-based diets. In the third trial, two series of diets were evaluated including fishmeal-based diets replacing MFO by 25%, 50%, 75% and 100% MCO and three poultry meal-based diets with 100% MFO, 75% MCO and 75% MCO supplemented with 4% hydrolysed salmon by-product meal (HSM) as an attractant. In conclusion, no significant differences in performances of shrimp between diets were noted indicating no palatability issue in poultry meal-based MCO diet and confirmed the efficacy of replacing 100% MFO by MCO in a low fishmeal diets and up to 75% in poultrymeal-based diets without compromising the growth of shrimp.