الفهرس 
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Abstract
A Total number of 240 marine shrimp samples (120 Penaeus japonicus and 120 Penaeus latisulcatus) were collected randomly along the four seasons (30 samples from each species in each season) Spring , Summer , Autumn and Winter respectively from Suez Bay , Suez Governorate, Egypt , along with 8 samples of water samples . Clinical and postmortem examination revealed appearance of black spots of melanization in different parts along with erosions and necrosis mostly in appendages, beside congestion and black discoloration of internal organs. Bacteriological examination was done using hepatopancreas, gills, musculature, external skeleton, haemolymph, appendages specimens following steps of isolation and identification .Morphological and biochemical identification procedures revealed presence of Vibrio alginolyticus, Vibrio Parahaemolyticus and Aeromonas hydrophila isolates. Total prevalence of bacterial infections among examined shrimp species along the four seasons was 38.75%, while individual prevalence was 44.2% at Penaeus latisulcatus and 33.3% in Penaeus japonicus. Seasonal prevalence was 50% in spring, 76.7% in summer, 30% in autumn and 20% in winter for Penaeus latisulcatus ,but was 36.7% in spring, 56.7% in summer, 26.7% in autumn and 13.3% in winter for Penaeus japonicus. Histopathological examination showed variable ranges of necrosis and degenerative changes on hepatopancreas, gills, musculatures and gonads. Antibigram sensitivity test showed different ranges of sensitivity and resistance against used antibiotic discs. Results of water analysis showed certain values that were suitable for occurrence of bacterial infections.