EFFECT OF REPLACING FISFMEAL WITH ALKOARA SILAGE IN THE FORMULATION OF DIETS FOR NILE TILAPIA (O.niloticus).

Abstract

The experiment was carried out a period of 45 days; from19/6 to 3/ 8/ 2016. The experiment design flow through system was developed at the fish hatchery department of fisheries science and wildlife, to determine the effect of replacing fishmeal with alkoara silage in the formulation of diets for Nile tilapia (O.niloticus). 240 Nile tilapia fingerlings (average weight 6.40 gm.) Fish were distributed in flow through system of 12 plastic aquariums (34*22*18 cm) each containing about 40 liters , acclimatized to the hatchery conditions for 3 days. Before the beginning of the experiment, weak and abnormal fish were excluded and the remaining fish redistributed on aquariums at 20 fingerlings / aquarium. The , 0experiment included 4 treatments with 3 replicated aquariums for each. Feeds C(The diets replacing 0, 25, 50 and 75% of fish meal protein content 3and T 2, T1Tby fish silage.Results indicated that final body weight (BW), weight gain (WG) and specific growth rate (SGR) of O. niloticus increased with increasing level of fish silage in diets. WG was found 7.90, 7.01 and 7.98 for T1, T2 and T3 respectively. The data were analyzed by one-way analysis of variance (ANOVA, F test) and LSD for significantly different means at a significance level of 0.05 using SPSS version 19