Ingredient Diet 1 ( 0% salt) Diet 2 (1% salt) Diet 3 (1.5% salt) Diet  4 (2% salt) Fish meal 21.90 21.65 25.52 21.40 Soybean meal 21.90 21.65 25.52 21.40 Maize bran 25.60 25.35 25.23 25.10 Rice bran 25.60 25.35 25.23 25.10 Cassava flour 2.0 2.0 2.0 2.0 Salt 0 1. 1.5 2.0 Vitamins 1* 1.5 1.5 1.5 1.5 Minerals 2* 1.5 1.5 1.5 1.5 Total 100 100 100 100

1*.Vitamin premixes (as active matter g/100): A, 2000, 000 UI; D3 245, 000 UI; E, 1, 000 UI; C, 500g; B12, 3 mg; d-Pantothenic, (B6), 100 mg; pyridoxine, 100 mg 2*. Mineral premixes (as active matter g/100): Calcium hydrogen orthophosphate, 10.29; Magnesium sulphate, 50.00; Sodium chloride, 30.00; Potassium chloride, 5.00; Zinc sulphate, 2.75; Manganese sulphate, 1.27; Copper sulphate, 0.39; Cobalt sulphate, 0.24; Chromic chloride, 0.064. Premixes contained also 1.06 g Potassium and 21.2 g, Sodium salts.

Table 2: Composition of the experimental diets (Kg) fed to Oreochromis shiranus