An investigation was made on the parasitic infestation of an indigenous major carp, Labeo rohita collected from different water bodies of Rajshahi district during April 2006 to January 2007. A total of 70 host fishes were examined during the study period of which 55 fishes were found infected by numerous protozoan and metazoan parasites. In all 2348 parasites belonging to eight genera were recorded from the surveyed hosts. Among them six were ectoparasites (Trichodina, Myxobolus Chilodonella, Dactylogyrus, Gyrodactylus and Argulus) and two were endoparasite (Eucreadium and Camallanus). The infestation exhibited monthly or seasonal fluctuation, the maximum abundance of parasites was recorded in the month of December and the minimum in July. It was observed that the infection was the maximum in pre-winter to winter and the minimum in the rainy season. Prevalence, intensity and abundance of the infestation were also found to be related to different length group of the hosts, the medium sized fishes were more infested and the larger size fishes were less infested while the smaller size fishes showed medium infestation.
The parasitic infection was studied on Cirrhina mrigala, an indigenous major carp in different water bodies of Rajshahi district during April 2006 to January 2007. A total of 83 specimens of C. mrigala were examined during the study period of which 74 fishes were observed to be infected by numerous protozoan and metazoan parasites. A total number of 3063 parasites were recorded from the infected fishes. Ten different parasitic genera, Trichodina, Myxobolus, Chilodonella, Ichthyophthirius, Dactylogyrus, Gyrodactylus, Fellodistomum, Eucreadium, Camallanus and Argulus were identified from the hosts sampled. Among them seven were cetoparasites and three were endoparasites. Parasites were collected from different body parts of the fishes. Most of the parasites were collected from external body surfaces and gills. Prevalence, intensity and abundance of the infection with parasites were varied to different length groups of the hosts and months of the year. In case of length, the medium sized fishes were more infected than the maximum sized and their prevalence, intensity and abundance were highest. Infection rate was lowest in larger size fish group. In seasonal variation, the maximum infection was observed in pre-winter and the lowest number was recorded in rainy season.
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