Year : 2010  |  Volume : 1  |  Issue : 4  |  Page : 48-50

Parasitic prevalences in fresh water prawn Macrobrachium rosenbergii in north and south 24 Parganas districts of West Bengal

1 Department of Industrial Fish and Fisheries, Asutosh College, Kolkata - 700 026, India
2 Department of Aquaculture Management and Technology, Vidyasagar University, Midnapore - 721 102, India
3 Department of Zoology, Vidyasagar University, Midnapore - 721 102, India
4 Department of Fish Pathology, West Bengal University of Animal and Fishery Sciences, Kolkata - 700 037, West Bengal, India

Correspondence Address:
Monjit Paul
P - 227/1, Upen Banerjee Road, Kolkata - 700 060, Parnashreepally, Behala, West Bengal
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2229-5186.76989

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The occurrence of different freshwater prawn (Macrobrachium rosenbergii) parasites, found during the period from April to August 2007, was investigated in different freshwater wetlands of north and south 24 Parganas districts of West Bengal state in India. Eleven parasites - Zoothamnium, Epistylis, Gregarina, Amphileptus, Dileptus, Myxobolus, Chilodonella, Balladyna, Gozia, Rhabdochona, Indocucullanus, Procamallanus and Cucullanus - were found after examining 1,000 specimens of Macrobrachium rosenbergii of different-sized groups. The highest prevalence of the parasites was recorded in the size group of 81-85 mm and 136-140 mm. The intensity of ectoparasitic infection was observed to be high with an increase in size. The gills and the surface of the body were mostly infected. Endoparasites were found in the intestinal part, and mostly due to poor raw foods given to the prawns as their diets. The parasites get more shelter and space for them. The highest intensity of those parasites was found in the month of August due to favourable autumnal conditions, with little rain and favourable breeding time of the parasites. Stressed and weak prawns are more vulnerable to infestation under adverse environmental conditions.

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