Abstract
The species composition of parasites in the estuary of the Penzhina River was studied (114 species). The influence of the specific conditions of the estuary on the parasite fauna was shown. High flow rates, mixing of fresh and sea waters, and the abundance of organic matter determine the predominance among parasites of species with morphological adaptations for reliable fixation on fish tolerant to changes in salinity and associated with benthos in the life cycle. Transitions of parasites to atypical hosts have been noted. The component communities of parasites of most fish species are characterized by high indices of diversity and evenness and low indices of dominance. In the marginal populations of pike and whitefish, they are strongly depleted with pronounced dominants and their change in ontogeny. The Arctic and Pacific elements of the ichthyoparasite fauna testify to the influence of the Arctic and Pacific oceans on its formation.
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