A study has been done to find out the prevalence of different kinds of parasites in Cirrhinus mrigala (Hamilton 1822) during 2010-2011. It has been found that the temperature variation affects some parasitic infestation over the fish species. It was found that ciliophoran and crustacean parasites are more prevalent from November to February whereas the myxozoan and monogenean parasites are more prevalent from January to April. Considering temperature variation throughout the year it has been inferred that most of the parasitic infections were found between November and April when the temperature range varies from 19 to 26°C. So from the study it can be concluded that lower temperature elicits the parasitic growth in fishes while the higher temperature retards the growth.

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Myxobolus Bütschli 1882 is an important group of parasitic protozoa infecting a large number of freshwater fish species worldwide. The severity of Myxobolus infection leads to heavy loss in production of fishes. During the survey of the fish parasites, a new species of the genus Myxobolus have been isolated from the gills of a freshwater edible fish Cirrhinus mrigala Hamilton, 1822 from Canning, South 24 Parganas, West Bengal, India which has been described here.

Background: Epulides, tumors of periodontal origin, are commonly reported in dogs and infrequently in cats. But its documentation among wild animals is scarce. Retrospective study of the available literature did not find any report of epulis in sloth bears, though dental pathology is common in captive sloth bears. The present study depicts the details about an incidence of bilateral epulides in a captive sloth bear of Nandankanan Zoological Park, Bhubaneswar, India and its successful surgical management.Methods: A male sloth bear aged about 15 years, developed bilateral swellings at the upper jaw, protruding out of the oral cavity, impeding with its normal feeding and drinking. Close physical examination under general anaesthesia revealed that the swellings are bilateral epulides at the upper jaw involving canines of both sides. The epulides were surgically excised, histopathology of the excised mass was conducted and a course of antibiotic treatment was followed.Result: The epulides were found to be of fibromatous and ossifying type. In the present case, there was no recurrence of epulides at the surgical site after their excision and the procedure proved curative. This work is a complementary contribution to the dental pathology study of sloth bears in captivity.

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