Different milling degrees of ingredients in diet for Nile tilapia (Oreochromis niloticus L.) during growth phase

A trial aimed to compare pelletized diets with different milling degrees (0.50 to 1.50 mm) on the performance and food transit velocity rate (FTVR) of Nile tilapia during growth phase, is presented. Forty animals with mean initial weight of 68.95 g and total length of 15.94 cm were distributed with two treatments and five replications in 500 l concrete tanks. There was no difference between milling degree respect the condition factor, carcass and fillet yield of the fishes. It was concluded that the use of 0.50 mm milling degree diet promoted the slowest food transit velocity and the best performance for Nile tilapia during growth phase.