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Abstract
The main objectives of the present study were :
1-To study the effect of different levels of dietary selenium supplementation in acommercial diet in the form of sodium selenite (Na2seo3) (0.3ppm), se-yeast (selplex) (0.3 ppm) and nano selenium (0.3 and 0.6 ppm) on growth performance ,feed utilization, body composition and hematological parameters of Nile tilapia (Oreochromis niloticus) fingerlings.
2-To study the effect of different levels of dietary selenium on reproduction performance parameters on Nile tilapia (Oreochromis niloticus) broodstock.