الفهرس 
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Abstract
In this study, a total of (300) marine fishes of three different species that were represented
as: Sparus aurata, Siganus rivulatus, and Tilapia zillii randomly collected from Lake
Temsah at Ismailia governorate from May 2012 to April 2013. The clinical picture of the
diseased fishes, was recorded as 108 fishes were found to be infected with Vialginolyticus,
as Gram negative, short rod bacilli as comma shaped and motile bacteria .. Sparus auratus
was the most infected fish spp (46), followed by Tilapia zillii (34), while Siganus
rivulatus was the lowest infection (28). The results indicated that, the highest total
prevalence of vibriosis among the naturally infected marine fishes was recorded in the
summer season (56%), followed by spring (48%), then autumn (26.67%), while the
minimal prevalence of infection was recorded in winter (13.33%). Estimation of iron in
water of Lake Temsah was from 2 different locations respecti vel y ill summer
season5.8±1.4, 5.5±1.09 in spring 4.3±1.6, 4.2±1.3 ill winter 0.46±0.02, 0.50±0.10 in
aurumn5.3±1.l9, 5.07±0.5. In tissues, iron decreased in diseased fishes and that showed in
liver, spleen, kidney and ill musculature ill the 3 different fish species.
histopathological studies of naturally infected marine fishes showed severe inflammatory
reactions in different organs with accumulation of melanomacrophages and necrosis.