T wo experiments were performed in order to evaluate two feed stuffs, namely fermented fish silage (FFS) and boiled full-fat soybeans (BFS) as alternative protein sources for fish meal (FM) or fish meal replacers in Nile tilapia feeds. Both FFS and BFS performed well up to 50% substitution of FM without a significant loss in performance reared fish. These results also indicated that FFS is a promising feed ingredients for substituting fish meal at 25-50% dietary protein in Nile tilapia diets. When different levels of boiled full-fat soybeans (BFS) were tested in the next experiment, similar results were obtained. Among this tested levels, substitution of fish meal with 25% dietary BFS was possible without any significant reduction in performance parameters The utilization of FFS or BFS as the only dietary protein source (100%) significantly reduced growth performance of the tested fish. 138 Elham A. Wassef et al easily used, in the developing countries such as Egypt, to produce fish ^lage, another form of fish meal (Wassef, 1991),that reduces the Impendence of imported fish meal for fish feeds. Nile tilapia (O mh(icns) is the most important fish cultured in Egypt. Intensive culture of this species has expanded in recent years, however the potential of using different feed stuffs in practical diets of tilapia is needed. The protein sources namely, fermented fish silage and boiled full-fat soybeans as substitutes for fish meal in Nile tilapia diets are tested to determine the optimum inclusion level-of each. These two feed stuffs are relatively inexpensive, easy to produce on Umn and readily available than fish meal.
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