This experiment was carried with the objective of comparing pelletized and extrused diets for reversed Nile tilapias, from 188.9 to 362.4g. One hundred Nile tilapias were, distributed in an entirely randomized design with two treatments and five replications. Temperature and water transparency data were taken every five days. Concerning feed conversion and survival rate there was no difference (P>0.05) between diets pelletized and extrused. The greatest gain and protein efficiency rate (P<0.05) were achieved by extrused diet, as well as the best result of uniformity. Regarding the average cost of ration per kilo gained by fish in each treatment, the least cost (P<0.05) was achieved by pelletized diet. It may be concluded that extrused diet favoured the great gain, however, the least cost of ration per kilo is achieved by pelletized diet.
extrusion; Nile tilapia; pelletization; performance
