Abstract
A study was conducted to determine the level of contamination by indicator organisms (Salmonella and Escherichia coli) in shrimp (Penaeus monodon) farms, depots and processing plants of Coxs Bazar, Khulna, Bagerhat and Satkhira districts of Bangladesh using conventional technique of bacterial isolation and identification. The results of this study revealed that prevalence of Salmonella positive samples was 43.7%, 62.5%, 20% and 0.0% for water, pond scum, shrimp and basket samples, respectively at farm level. Meanwhile, the prevalence of E. coli positive samples was 62.5%, 43.7%, 60% and 60% for water, pond scum, shrimp and basket samples, respectively at farm level. In case of depots, shrimp, basket and mat samples were analyzed and found 20%, 56.3% and 23% positive for Salmonella and 53.3%, 37.5% and 92.3% positive for E. coli. Bacteriological assessment of the shrimp samples obtained from four seafood processing plants revealed that all the samples were found contaminated with Salmonella and E. coli except the samples of one industry. Investigation finally showed that with few exceptions all the samples from farms, depots and processing plants have different levels of contamination by Salmonella and E. coli, which is very much alarming for shrimp industry of Bangladesh.Asian J. Med. Biol. Res. June 2016, 2(2): 171-176
Highlights
Shrimp is considered as ‘white gold’ for Bangladesh and contributing an important role in national economy
This study revealed the survey results on the prevalence of Salmonella and E. coli contamination at different shrimp farms, depots and processing plants of some selected areas of Bangladesh
Two sampling methods were used such as (i) direct inoculation of samples in pre-enrichment medium and (ii) cotton swabs taken from shrimp, basket and mat/polythene sheet were directly streaked on the surface of Salmonella-Shigella agar (SS agar) plates and the swabs were inoculated in the pre-enrichment medium
Summary
Shrimp is considered as ‘white gold’ for Bangladesh and contributing an important role in national economy. The natural habitat of Salmonella is the gastrointestinal tract of animals including birds and man (Pelzer, 1989). These organisms find its way into the river water, coastal and estuarine sediments through fecal contamination. The occurrence of Salmonella in fish and shellfish, either in fresh or marine waters has normally been associated with fecal contamination of the area from which they were harvested (Buttaiux, 1962) On the other hand, Escherichia coli, the representative of coliforms, are gram-negative, rod-shaped facultatively anaerobic bacteria
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