Bacteriological studies on psychrotrophic bacteria and Pseudomonas isolated from frozen fish.

Document Type : Original Article


1 Bacteriology, Immunology, and Mycology, Faculty of Veterinary Medicine, Benha University, Benha, Egypt

2 Bacteriology,veterinary,Sadat,Egypt

3 Department of Bacteriology, Immunology and Mycology, Faculty of Veterinary Medicine, Benha University

4 Department of food hygiene, Animal Health Research Institute, Shibin El kom


Frozen fish exposed to many risks of contamination during long chain of catching, transportation, dressing and freezing from different sources. Till they reach to consumers which make it harmful or unfit for human consumption.
A total of 100 random samples of Saurus and Mackerel (50 of each) were collected from different fish markets in El- Menofia governorate. They were subjected to bacteriological examination for isolation of Psychrotrophic and Pseudomonas species. The bacteriological examination revealed the mean values of total Psychrotrophic count in the examined samples of Saurus was 1.05×109±1.4×108 and 1.013×109±1.6×108in Mackerel. The incidence of Pseudomonas species was 40%, 50% of the examined samples of Saurus and Mackerel, respectively. The incidence of identified Pseudomonas spp isolated from the examined samples of frozen fish were Ps. aeruginosa, Ps. dimenuta, Ps. fluorescence, Ps. putida and Ps. fragi. The Pseudomonas spp were resistant to Chloramphenicol and Nalidixic acid. In contrast they were sensitive to Gentamycin except Ps. fluorescence .


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