This study was conducted in river Nile state, north Sudan aimed to give base line information on the potentialities of transmission of Salmonella spp from water source to fish in muddy season, in AL-fadlab and Al-akad stations. Twenty samples of water and Schilbidae spp fish were taken from the two stations and transferred to the laboratory for physiochemical and microbial analysis of water and studding fish species. Samples were performed using standard bacteriological procedures. Swaps from each fish gill were microbiologically analyzed for Salmonella spp and total plate count . Results indicated that studied fish infected by Salmonella spp in AL-fadlab station was 44.83±8.6 while in Al–akad station was 9.33±1.4, Salmonella spp in water was 5.00±1.0 in AL-fadlab station while it has no growth in Al–akad station. On the other hand, total plate count in fish gills was uncountable in AL-fadlab station and 30.40±7.1 in Al–akad station. Total plate count in water, was 8.13±1.87 for AL-fadlab station and 11.67±2.04 for Al-akad station. Statistical analysis showed significant difference (P 0.05) in all studied parameters except the total plate count in water. There was also no significant difference in weight and length of studied fish species and also in water turbidity and temperature from both stations, but water pH showed significant difference (P 0.05, 7.62±0.04 and 9.53±0.08 for Al-fadlab and Al-akad, respectively). Schilbidae spp fish infected by Salmonella spp in studied stations is an indicator of the contamination by untreated municipal sewage, runoff, and storm-water. Therefore, Schilbidae spp fish from studied areas have to be carefully handling and heating before consumption to avoid the pathogenic bacteria risks.
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