الفهرس 
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Abstract
Three trials were conducted with fry gilthead Sea bream, the first studied the effect of partial replacement of Fish meal by plant protein (PP) (33%, 50% and 66% PP) under two stocking densities (40 and 55 fry/m3), the second was to study the effects of concrete ponds volume (1 and 10 m3 water capacity) and the third was to study the difference between animal protein and plant protein effects.
In the first trial, the partial replacement of fish meal protein by plant protein had significant effects (P0.05) on the growth performance parameters and feed conversion ratio (FCR). While, the highest values were obtained with the diet contained 33% plant protein. Survival rate was within the range 83.55-86.58% with significant differences. The higher feed consumption was observed for those fish fed higher levels of Fish meal (33% PP). The results indicated that stocking density of 55 fry/m3 improved growth performance and FCR compared with stocking density of 40 fry/m3. Diets affect body chemical composition significantly where 50% PP had the greatest effect of body protein and the lowest ether extract.
In the second experiment, results showed that concrete ponds volume had postive significant effects (P0.05) on growth performance parameters, where the 10 m3 volume was better than 1m3 volume. The best FCR was also recorded with 10 m3 concrete ponds volume.
In the third experiment, fish meal protein had higher significant effects (P0.05) than plant protein on growth performance, survival rate, FCR, body protein and body fat.
Key words: gilthead Sea bream, growth performance, fish meal, stocking density, plant protein, body chemical composition, feed.