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«IZVESTIYA IRKUTSKOGO GOSUDARSTVENNOGO UNIVERSITETA». SERIYA «BIOLOGIYA. ECOLOGIYA»
«THE BULLETIN OF IRKUTSK STATE UNIVERSITY». SERIES «BIOLOGY. ECOLOGY»
ISSN 2073-3372 (Print)

List of issues > Series «Biology. Ecology». 2025. Vol 51

Biological and Parasitological Characteristics of Commercial Fish Species of the Kas River (Yenisei River Basin)

Author(s)

N. O. Yablokov1, K. V. Polyaeva1, Yu. K. Chugunova1

1  Krasnoyarsk Branch of the Russian Federal Research Institute of Fisheries and Oceanography, Krasnoyarsk, Russian Federation

Abstract
The article presents a comprehensive study of the ichthyofauna and parasitofauna of the Kas River, which is part of the Ob’-Yenisei Canal (the Ket’-Kas Canal). The relevance of the work is determined by the fact that the fish resources of many small and medium-sized rivers in the Yenisei basin remain understudied, while stocks of valuable species in the Yenisei River itself have been significantly depleted. Furthermore, the canal represents a potential pathway for the invasion of species and parasites from the Ob’ River basin. The aim of the study was to assess the species composition, structural and biological parameters of commercial fish species, and to obtain initial data on the parasitofauna of the Kas River. Ichthyological materials was collected in September 2021 in the lower reaches of the Kas River using fixed gill nets, a seine net, and hook gear. In total, biological analysis of 124 fish specimens and parasitological analysis of 61 specimens were performed. The research recorded 13 commercial fish species belonging to 6 families. The greatest species diversity was shown by cyprinids (6 species). The dominant species in catches by abundance was the roach (33.9%), with subdominants being the river perch (22.0%) and the dace (16.1%). In terms of biomass, pike, roach, and perch predominated in the catches, collectively accounting for about 70% of the total catch. Average catch rates were 3 kg per twenty-four-hour period per net set and 1.5 kg per seine net haul. This composition of the fish community is typical for the left-bank tributaries of the Yenisei within the West Siberian Lowland. Parasitological examination revealed 19 parasite species belonging to 5 systematic groups: myxosporidians (5 species), cestodes (2), trematodes (5), nematodes (4), and acanthocephalans (3). The greatest species diversity was noted for myxosporidians and trematodes. The absolute dominants in terms of invasion intensity and abundance index were the myxosporidian Myxidium rhodei in the kidneys of roach and the trematode Rhipidocotyle campanula in the intestine of pike. The composition of the parasitofauna reflects the riverine conditions and trophic linkages of the fish: high infestation is associated with the consumption of benthic organisms, which act as intermediate hosts for many parasites. A key finding is the absence of muscle flukes in fishes of the Kas River, specifically Opisthorchis, despite the hypothetical possibility of their penetration through the canal from the Ob’ basin. The obtained data are of significant practical importance for preparing recommendations for the development of fisheries in small rivers, and assessing the safety of fish products. The data on the parasitofauna of the Kas River, presented for the first time, contribute to the study of the biodiversity of Siberian water bodies.
About the Authors

Yablokov Nikita Olegovich, Candidate of Sciences (Biology), Leading Specialist Krasnoyarsk Branch of Russian Federal Research Institute of Fisheries and Oceanography 33, Parizhskaya Kommuna st., Krasnoyarsk, 660049, Russian Federation e-mail: yablokov@niierv.vniro.ru 

Polyaeva Ksenia Viktorovna, Leading Specialist Krasnoyarsk Branch of Russian Federal Research Institute of Fisheries and Oceanography 33, Parizhskaya Kommuna st., Krasnoyarsk, 660049, Russian Federation e-mail: glechoma21@gmail.com 

Chugunova Yulia Konstantinovna, Candidate of Sciences (Biology), Head of Laboratory Krasnoyarsk Branch of Russian Federal Research Institute of Fisheries and Oceanography 33, Parizhskaya Kommuna st., Krasnoyarsk, 660049, Russian Federation e-mail: jhermann@mail.ru

For citation
Yablokov N.O., Polyaeva K.V., Chugunova Yu.K. Biological and Parasitological Characteristics of Commercial Fish Species of the Kas River (Yenisei River Basin). The Bulletin of Irkutsk State University. Series Biology. Ecology, 2025, vol. 51, pp. 46-62. https://doi.org/10.26516/2073-3372.2025.51.46 (in Russian)
Keywords
the Ket-Kas Canal, inland fisheries, fish nutrition, catch, fish parasites, muscle flukes, intestinal parasites.
UDC
639.21+639.2.09
DOI
https://doi.org/10.26516/2073-3372.2025.51.46
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