الفهرس 
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Abstract
It was conducted at El-Abbassa Fish Hatchery belonging to the General Authority for Fish Resources Development, El-Abbassa, Sharkia, Governorate, during the spawning season of common carp, Cyprinus carpio, from March to July 2012, 2013.
The aim of this study is to find out causes of mass mortality in Cyprinus carpio eggs during peak- breeding season between April to July 2012 and 2013 at El-Abbassa Fish Hatchery-The General Authority for Fish Resources Development, El-Abbassa, Sharkia Governorate. Physicochemical and microbial characteristics of culture water were examined during the induced breeding of Cyprinus carpio besides mycological and histopathological examination of egg samples with trial of treatment of different types of disinfectant.Also, The objective of this study was to evaluate the effect of prebiotics and probiotics on. Larva and fry of Cyprinus carpio growth performance, non-specific immunity and chemical composition of C. carpio. The present study aimed also to evaluate the bioaccumulation of some pollutants (malathion and cadmium) in the muscles of C. carpio fingerling after exposure to two sublethal concentrations of the two pollutants. In addition to investigate the effect of two pollutants on some blood biochemical parameters (glucose, creatinine, cholesterol and alanine aminotransferase). The results of this investigations revealed that:
1- The total bacterial count fluctuated between 4.2 x 1010 cfu/ml after 24 hrs of fertilization and 48 x 1010 cfu/ml after 4 days of incubation and till hatching. This means that, there was 11 times average increase in.