Effect of dietary lipid sources (canola and corn oil) on growth, survival, and fatty acid profile of Nereis diversicolor

The study of effect four diets formulated containing vegetable oils including canola and corn oils and their mixture, in three replications each, was carried out to feed N. diversicolor during two months. At the end of the experiments, growth performance in each treatment included total biomass, L3 length, specific growth rate (SGR), body weight increase (BWI), and survival rate were measured. Biochemical composition including total protein, total fat and fatty acid profile of diets and worms body carcass were analyzed. The results showed that there was no significant difference in the growth performance of worm from diets containing different oils with control treatment (worms fed from diet of without oil). The results indicate that the fat in the diet has no effect on the growth of the worms, but the presence of these vegetable oils in carcass composition was important. The results of this study showed that all saturated and unsaturated fatty acids in the diet, except of the control treatment in the N. diversicolor, were higher than their dietary. In the present study, N. diversicolor, fed from diet containing of canola oil, had the highest ⍵-3 fatty acids. The highest EPA level and ratio of ⍵-3/⍵-6 in the worms fed canola oil were higher than formulated diet containing canola oil. Totally, treatment 1, including diets containing canola oil, was more suitable for increasing the growth perfoermance and unsaturated fatty acids of worm than other treatments.