الفهرس 
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Abstract
This study aims to describe the trends and methods of using additives used in feed or water and their relationship to production in Egypt. The study included two complementary experiments:
Experiment 1: A survey of trends in the use of feed and water additives in
tilapia fish farming in Egypt
Experiment 2: Studying the effect of using EDTA zinc and/or organic selenium on water quality, growth rates, immune response to oxidation, and final profit margin in feeding Nile tilapia fingerlings (Oreochromis niloticus) cultured in a greenhouse system in winter at different densities.