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Nitrogenous (N) and phosphorus (P) wastes discharged into water by Nile tilapia Oreochromis niloticus L. (initial mean weight: 16.4 g) fed in tanks for 90 days was studied. Fish were fed with six isonitrogenous (29.2% crude protein) and isoenergetic (16.9 Kj g-1) diets A0, A10, A20, A30, A40 and A50, containing 0%, 10%, 20%, 30%, 40% and 50% of Azolla meal (AM) respectively, as partial fishmeal (FM) substitutes. Diet A0, without AM, served as a control. Growth performances were higher with the control diet, and a decreasing trend was found when AM level was higher than 10% in diets (P © 2010 International Formulae Group. All rights reserved. Keywords: Azolla, fish meal replacement, Oreochromis niloticus , nitrogen, phosphorus, nutrient balance.

Evaluation of nitrogen and phosphorus wastes produced by Nile tilapia (<i>Oreochromis niloticus</i> L.) fed Azolla-diets in concrete tanks