Effect of Guar Seed Meal in Fish Diets for Nile Tilapia (Oreochromis Niloticus) Reared in Hapas = تأثيرإضافة مسحوق بذور الجوار في علائق أسماك البلطي النيلي المرباة في الهابات

Abstract

The effect of guar seed meal as a protein substitute in the diets for Nile tilapia was investigated. A 12-week feeding trial was carried out using triplicate groups of Nile tilapia with 1.1±0.1 g initial weight. Dietary protein was replaced at 25, 50, and 75% protein basis by guar seed meal. Four experimental diets were formulated and marked as D1 (control), D2, D3, and D4. At the end of the restricted feeding trial at 6–4 % of biomass, there were significant differences (P < 0.05) on growth performance including weight gain, RGR, SGR, and survival rate among dietary treatments. The experimental diets did not affect the body composition in terms of protein, lipid and, ash contents. No diet related histopathological changes were noted in the posterior intestine and/or liver samples from any dietary group. Our findings suggest that the inclusion of guar seed meal in the diets for Nile tilapia fingerlings reared in hapas can be replaced up to 50% of dietary protein without adverse effects.