Production of Nile tilapia (Oreochromis niloticus) and mullet (Mugil cephalus) as affected with dietary protein source in polyculture system was compared. Four experimental diets were formulated to contain (25.3±0.16) crude protein. Diet 1 was free from soybean meal, while fish meal was replaced at 50, 75 and 100 % levels with soybean meal in diets 2, 3 and 4, respectively. The dietary treatments were carried out in 4 earthen ponds each of total area of 5 feddans (2.1 ha). The diets were offered at 3% rate of body weight (B.W), at two times a day. The ponds were prepared and fertilized by 1200kg/h chicken manure, 150 kg/h super phosphate and 60kg/h urea. The growth performance parameters was significantly different (p
Key words: Diet; Fish meal; Soybean meal; Polyculture; Oreochromis niloticus; M cephalus.
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