Pathogenicity of Staphylococcus epidermidis in Oreochromis aureus
2000
Mirza, M.A. (Government Coll., Lahore (Pakistan). Dept. of Zoology) | Irram, H.
In the present study specimens of Oreochromis aureus weighing 5.40 to 5.60 g were exposed by dipping in 32x10 and 48x10 cells/ml of S. epidermis each for 30 and 60 minutes separately. The changes produced were: sluggish activity, fusion of gill filaments, blackening of body in the areas of lateral line, lower jaw, vent and margin of fins; haemorrhage in snout, caudal, anal and pectoral fin together with ulcerated tail. The fish exposed to 32x10 cells/ml for 30 minutes showed a decrease in the weight of body, gills, kidney, liver and gut to the tune of 4.5%, 57%, 62%, 65% and 41% respectively. When the exposure time was increased to 60 minutes, the decrease in the weight of body, gills, kidney, liver and gut was to the tune of 5%, 69%, 67%, 71% and 52% respectively after ten days of exposure. When the fish was exposed to 48x10 cells/ml for 30 minutes, there was observed a decrease in weights of body gills, kidney, liver and gut to the level of 4.5%, 66%, 60%, 67% and 39% while on increasing the exposure time to 60-minutes a decrease of 4.6%, 76%, 80%, 69% and 50% was observed in the body, gills, kidney, liver and gut weights respectively. An increase in viable count to the tune of 519% and 412% was observed in fish dipped in 32x10 cells/ml for 30 and 60 minutes respectively. An increase in viable count up to 395% and 460% was observed in fish exposed to 48x10 cells/ml for 30 and 60 minutes after ten days respectively.
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