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Abstract:
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The great potential for the culture of non-penaeid prawns, especially
Macrobrachium rosenbergii in brackish and low saline areas of Indian coastal zone has
not yet been fully exploited due to the non availability of healthy seed in adequate numbers
and that too in the appropriate period. In spite of setting up several prawn hatcheries
around the country to satiate the ever growing demands for the seed of the giant fresh
water prawn, the supply still remains fear below the requirement mainly due to the
mortality of the larvae at different stages of the larval cycle. In a larval rearing system of
Macrobrachium rosenbergii, members of the family Vibrionaceae were found to be
dominant flora and this was especially pronounced during the times of mortality
However, to develop any sort of prophylactic and therapeutic measures, the pathogenic
strains have to be segregated from the lot. This would never be possible unless they were
clustered based on the principles of numerical taxonomy It is with these objectives and
requirements that the present work involving phenotypic characterization of the isolates
belonging to the family Vibrionaceae and working out the numerical taxonomy,
determination of mole % G+C ratio, segregation of the pathogenic strains and screening
antibiotics as therapeutics at times of emergency, was carried out. |