Contamination of clarias gariepinus fish with psychrotrophs particularly aeromonas species

الملخص EN

Fifty samples of fresh Clarias gariepinus fish were collected randomly from different markets at Tanta city, Gharbia governorate.

These samples were examined for isolation and identification of psychrotrophic bact-eria, particulary Aeromonas species, the isolated strains of psychrotro-phic species were Acinetobacter 8%, Aeromonas 56%, Alcaligens 12%, Chromobacterium10%, Psuedomonas 28% and Flavobacterium 6% .

Further identification of Aeromonas species were recovered as Aerm-onas A.hydrophla, 30% A.pumctata 16% and A.salmonicida 10%.

All Aeromonas speices were examined for their ability to produce lipolytic, proteolytic, hemolytic and Dnase activities in different percentages 78.6%, 71.4%, 82.1% and 67.9% , respectively.

Concerning the antibiotic sensitivity of the isolated Aeromonas strains, they were sensitive to enrofloxacin, gentamycin, oxytetracycline, tetracycline and nalidixic acid on other hand, they have a high resistance to amoxi-cillin, ampicillin, pencillin, erythromycin, and lincospectin.

The public health significance of isolated strains and recommended sanitary measures were discussed.