Effect of different dietary oil sources on fish performance, feed utilization and body composition of red tilapia (Oreochromis sp.) fry [electronic resource].

Includes references.

This experiment aims to study the effect of different oil sources on growth performance, feed utilization and body composition of red tilapia (Oreochromis sp.) fry With initial body Weight of 2.1±0.06 g. Six isocaloric diets (262 kcal metabolizable energy 11009) containing 28% crude protein, with different sources of dietary oils were used. Each diet was fed in triplicate to six groups of fish two times a day to apparent satiation for 70 days. Treatments were: fish oil (FO); corn oil (CO); soya oil (SO); linseed oil (LO); olive oil (OO) and sunflower Oil (SFO). Results showed that fish fed diet containing fish oil or linseed oil were significantly higher (P≤0.05) in final body weight, weight gain, percent body weight increases and specific growth rate sGR, than fish fed on other diets. Also, values of feed conversion ratio feR were improved significantly at fish maintained at FO and La diets compared to other treatments. Survival did not differ signifie:antly among the fish fed six different diets. likeWise, no significant differences were observed for body moisture or protein contents in all treatments. Upid content concentrations were affected by dietary treatments. Fish fed diets contained olive oil and sunflower oil were significantly lower in body lipid contents than those fed on other diets (P≤ 0.05). Feed utilization parameters were affected by dietary treatments. Highest values of PER, PPV% and ER% were obtained with fish fed FO and LO diets. Economic evaluation results showed that the effidency of replacement fish oil by iinseed oil in red tilapia diet is more economic and sharply reduced the fish feed cost. Fish oil could be replaced by a linseed oil in red tilapia diet without any effect on growth performance or feed efficiency ratio.

Summary in Arabic.

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