الفهرس 
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Abstract
Tow experiments were conducted at the Marine Fish Laboratory (MFL), of the Animal and Fish Production Department - Faculty of Agricultural Saba Basha - Alexandria University. This work was attempted to investigate the effect of energy and protein levels on survival, growth and food utilization, of European sea bass juvenile under a recirculating aquaculture system (RAS) using different types of probiotics as a substitute for natural bacteria using tow direction :-
1. First experiment:- Using different types of probiotics as a substitute for natural bacteria ach with two dietary energy levels (270 and 290 kcal / 100 g diet) each with three levels of dietary crude protein (34, 38, 42%) under a recirculating aquaculture system (RAS).