Abstract
The article presents the results of ichthyo-parasitological studies of roach Lake Vokhtozero in the area of economic activity of the cage farm OOO Raduzhnaya forel (rainbow trout). It is shown that the age structure of the roach population is represented by fish aged 3+ to 10+ years. It is based on sexually mature individuals of middle age: 4+ (25%), 5+ (31%) and 6+ (21%). Of these, 61% are females and 39% are males. Roach is infected with parasites of 14 species belonging to five systematic groups: Myxosporea - 5 species, Trematoda - 5, Ciliophora - 2, Nematoda - 1 and Monogenea - 1. The most common ones are mixosporidia and trematodes. The parasitofauna of roach corresponds to a wide spectrum of nutrition of this species with a predominance of benthic herbivorous type in older individuals.
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