Bacterial hazards especially pathogenic to human in consumable marine fishes of noakhali sadar, Bangladesh

The present study was conducted for microbiological assessment of ten available marine fish species of three different feeding habits collected from three different markets of Noakhali district from July, 2012 to April, 2013. For this, Total Bacterial Counts (TBC), Total Coliform (TC), Fecal Coliform (FC) and the occurrence of Salmonella and Vibrio spp., were determined by using serial dilution and spread plate technique. Among three feeding habits, the highest TBC (2.6 7± 1,69x 10⁸ CFLJ g^-1), Vibrio (2.37+1.83xl0³ CFU g^-1) and Salmonella spp., (2.19±1.26xl0³ CFLJ g^-1) were found in carnivorous and the highest TC (4.74±0.16x 10⁶ CFU g^-1) and FC (2.03+0.72x 10⁵ CFU g^-1) in omnivorous fishes. Among 10 marine species, Spotted Croacker, Greenback mullet, Asian Seabass contain the highest TBC (5.09+3.73x10⁸ CFU g^-1) and TC (4.18±4.01xl0⁶ CFU g^-1); FC (2.54+1.95xl0⁵ CFU g^-1) and Vibrio spp., (1.39±2.09xl0⁴ CFU g^-1); Salmonella spp., (3.5+2.36xl0³ CFU g^-1), respectively. TBC (2.99±2.76xl0⁸ CFU g^-1), TC (1.79±0.25xl0⁶ CFU g^-1), FC (2.23+1.45xl0⁵ CFU g^-1), Vibrio (9.16±1.36xl0³ CFU g^-1) and Salmonella spp., (2.55+2.01 xlO³ CFU g^-1) were the highest in gill and the lowest in skin. Among fishes of three different markets, the highest TBC (2.16+0.96xl0⁸ CFU g^-1), FC (1.73+1.08x10⁵ CFU g^-1) and Salmonella spp., (2.72±0.86xl0³ CFU g^-1) were found in the fishes of Dutter hat and the highest TC (1.13+0.45xl0⁶ CFU g^-1) and Vibrio spp., (4.38+1,02x 10³ CFU g^-1) in the fishes of Sonapur market. Bacterial densities of these fishes were higher than the acceptable limits. Findings of the present study suggest that marine fishes may act as reservoirs of harmful pathogenic species which creates many dangerous diseases such as cholera, typhoid etc. and the consumers should be careful about the qualities of fishes.