الفهرس 
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Abstract
This study aimed to determine the efficacy of some selected algae as a fodder in fish farms (Nile tilapia fish farm, which is the most common in Egypt.) This thesis studied the water column properties in the study area during annual cycle of fish farming from April to October 2004. This, in addition of isolation and identification of microalgae from the study area, biochemical analysis of microalgae, determination of algal growth and carrying out toxicity test for algal metabolic solution on tilapia larvae aiming to select the non toxic strains and test it on the monosex tilapia fingerlings. In addition of that, similarity index , diversity index and water pollution were calculated. Upon results, Chlamydomonas globosa and Nostoc spongiaeforme isolates gave zero percent mortality to tilapia larva in addition of, Nostoc spongiaeforme and Stigeoclonium lubricum cause significance increase in tilapia fingerlings. Data were analyzed statistically using SPSS, MVSP and CANOCO software to calculate the significance increases, cluster analysis and CCA analysis respectively.