الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
Aquaculture is considered an important sector for producing food it grows stesdily with growing population most of the modern aquaculture techniques depend on highly intensive systems with these intensive systems, the production of ammonia is the most serious problem (harvgreaves, 1998) thus, this study introduce a new technique for reducing the concentration of ammonia that produced by fish in the aquatic system.