Studies On Microbial Flora Of Marketed Rohu And Its Keeping Quality Under Refrigenration
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Date
1990
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Birsa Agricultural University, Ranchi
Abstract
The present work was undertaken to study the microbial flora of marketed Rohu and its keeping quality under refrigeration. The work was completed in two parte.
In the first part, a total of 30 Rohu were examined. There were collected from different fish markets in Ranchi in a period of about 5 months June to November, 1989). Their hygienic quality, bacterial flora of public health significance, sources of contamination and enter pathogenicity of the most common isolates were determined.
The hygienic quality of marketed Rohu were determined by total viable, coliform, faecal streptococcal and sulphite reducing clostridial counts. It was concluded on the basis of these counts that marketed Rohu were of poor hygienic quality.
Other microbial counts taken were, . aureup, Gran's negative bacteria, psychrotrophic Grem's negative bacteria and yeast and moulds. On an average it was found that gills of marketed chu have a higher microbial load followed by skin and muscle.
Altogether, 6 zpactes of Gran's positive bacteria, 16 spices of Gran's negative bacteria, 3 genera of moulds and one of yeast were isolated from different parts of marketed Rohu. The microorganisms vith a per cent distribution of 100 were, Hicrococcus spp., Proteus mirabi lig, Klebsiella oxytoce and Aeromonas hydrophila. 0111s harboured more types of microflora than the skin and muscle. Salmonella newport was isolated from gills and intestine of one of the marketed Rohu and perhaps it was the first report of its isolation from fish.