Abstract
In present study three experiments were carried out to investigate the effect of dietary sodium lactate, calcium lactate and calcium propionate levels as organic acids salts on growth, nutrient digestibility, proximate body composition, feed utilization and histological induces of Nile tilapia, Oreochromis niloticus and freshwater prawn, Macrobrachium rosenbergii. The results demonstrated that calcium propionate at a levels of 2% for Nile tilapia (experiment I) and either 2% or 3% for freshwater prawn (experiment II) recorded the highest significant growth performance, survival rate, feed utilization, body composition and digestibility were obtained, also, less histological alternations of liver, pancreas and testis were observed. Improving growth performance, survival and feed utilization was recorded also with dietary sodium lactate at a level of 1% for freshwater prawn (experiment III) with mild impact histological effects of hepatopancreas. No gonads intact were observed in all experiments treatments of Nile tilapia and freshwater prawn