The present study was conducted to determine microbial quality have been measured in gills and gut tissues in three imported fishes samples obtained from trawl fishing boats in Al-Faw city, Basrah, Iraq. In this study, tissues samples were collected from 80 fish samples of three fresh marine fish species: silver pomfret Pampus argenteus (Euphrasen, 1788); Oriental Sole Brachirus orientalis (Bloch & Schneider, 1801) and Yellowfin seabream, Acanthopagrus latus (Houttuyn,. 1782) were collected from trawl fishing boats of Al-Faw city during period from January 2017 to April 2017. Samples of three marine fish's species were examined for the fecal coliforms. Level of fecal coliforms was higher on tissues samples of Pampus argenteus were total number of fecal coliform identified were in 18 samples (22.50%) and in Brachirus orientalis fecal coliforms bacteria species were found in 11 samples (13.75%), while the lowest level of fecal coliforms was found in tissues samples of Acanthopagrus latus 4 (5%). To find out pathogenic bacteria culturing technique was used followed by staining for identification of bacterial species. In this study determination of coliforms especially Escherichia coli, Pseudomonas aeruginosa and Salmonella sp., three fecal coliforms Bacteria species were found (E. coli, P. aeruginosa, and Salmonella sp.) in tissues of three fish species samples in this study, E. coli was mostly present specie and it was identified in 16 tissues samples of P. argenteus (20.00%) followed by tissues samples of B. orientalis in 14 samples (17.50%), while were found in 10 tissues samples of A. latus (12.50%).

The bacterial content of the water of Metapenaeus affinis and Macrobrachium nipponense juvenile shrimp cultured in two salinities (3 and 15 g.L -1 ) were observed during 45 days. The initial and final weights of M. affinis were (0.939 ± 0.069 and 1.581 ± 0.183 g) in 3 g.L -1 , and (0.939 ± 0.065 and 2.274 ± 0.294 g) in 15 g.L -1 . While for M. nipponense, it was (0.914 ± 0.086 and 1.308 ± 0.070 g) in 3 g.L -1 , and (0.908 ± 0.070 and 1.086 ± 0.107 g) in 15 g.L -1 . The environmental factors were temperature 24-29 ˚C, acidity 7-8, and dissolved oxygen 5-10 g.L -1 . Bacterial contamination (CFU m.L -1 10⁶) was evident in treatment D and included four types of bacteria: Bacillus spp., Escherchia coli, Staphylococcus spp., Streptococcus spp., and Enterococcus spp. The survival rates of M. affinis during different breeding periods in the two salinities remained as follows: