الفهرس 
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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.