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Abstract The present investigation was carried out for evaluation the effects of substitution of dietary fish meal with soybean meal and corn gluten meal at different levels (0, 20, 40, 60, 80 & 100) in isocaloric (3000 Kcal DE/Kg), isonitrogenous (32% CP) diets on growth performance data, physiological response, body composition, level of some serum metabolites, healthiness of the internal organs and muscles and feeding costs of unit of weight gain of the Nile tilapia fingerlings. Nile tilapia fingerlinges (180 in number and of 16.86± 2.07 body weight) were divided into 6 equal groups and reared in 12 glass aquaria ( 2 replicates for each group) were used in this feeding experiment. Daily feed allowance was calculated according to the biweekly body weight as 3% of mean body weight of each group. The experiment was extended for 12 weeks. Growth performance (average body weight, body weight gain) and feed efficiency (feed consumption, feed conversion ratio & protein effecincy ratio) were measured biweekly. At end of the experiment, 6 fish were obtained from each group for proximate chemical analysis of whole body. Also, blood samples were collected from 6 fish from each group for serum preparation for determination of total protein, albumin & triglycerides. For histopathological examination, 6 fish were taken from each group as random samples for microscopic examination. |