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Title Microbial populations in deep sea water and fish of south east Arabian sea with spherical emphasis on Escherichia coli and coliphages
 
Names Madhusudana Rao, B.
Surendran, P.K.
Date Issued 2003 (iso8601)
Abstract Deep sea fish, deep sea surface water (DSW) and deep sea water from 200m depth
(DSW2()0) and littoral sea water (LSW) of the Arabian Sea (8-130N Latitude, 74-760E Longitude)
were analyzed for faecal indicators. E.coii could not be detected in DSW200. However, two
deep-sea fish, Psenopsis cynea and Heterocarpus woodmasoni had low levels of E.coii, 0.3 MPN/
g and 0.7 MPN/g, respectively, at the time of harvest. E.coii strains isolated from deep sea
environment have been found to be indistinguishable from terrestrial forms, either
morphologically or biochemically. DSW had almost equal proportions of Gram -ve (22%) and
Gram +ve (20%) bacteria whereas DSW200 had a high percentage of Gram +ve (46%) bacteria.
In deep-sea fish. Gram -ve were almost double of Gram +ve bacteria. Pseudomonas was the
predominant bacterial genus in deep-sea water samples whereas Vibrio was preponderant in
deep-sea fish. DSWjj, had significant proportions of Arthrobacter (24%) and filamentous
bacteria (17%). Yeasts were detected only in deep-sea fish samples. LSW collected from a
location 15 nautical miles off Quilon had high levels of faecal pollution. In LSW predominant
Gram +ve bacterial genus was Microaxrus (16%) wheres Pseudomonas (13%) and
Enterobacteriaceae (10%) were the prominent Gram -ve groups. E.coii and coliphages could
not be detected in deep-sea waters. A few deep-sea fish at the time of harvest showed low
levels of faecal pollution and were within the stipulated limits. The study showed that high
count of E.coii and coliphages in deep-sea fish procured from landing centres is not due to
polluted deep-sea fish or polluted deep-sea waters.
Genre Article
Identifier Fish Technol. 40(2): 105-114