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Ichthyofauna of the Zimnyaya Zolotitsa River at the Lomonosov diamond deposit

I.I. Studenov, G.M. Ustyuzhinsky

Section: Monitoring of natural and anthropogenically disturbed areas

Fish population comprehensive analysis of the Zimnyaya Zolotitsa River and its tributaries (the Svetlaya River and the Svetly Creek) in the impact zone of the Lomonosov diamond deposit started in 2000. Watercourses were studied before the construction of the channel around the pit, during and after its construction. Since the ichthyofauna monitoring points became permanent only in 2011, after the completion of the canal construction, the population indicators for the 2011–2021 period are analyzed. Eleven fish species were found in the ichthyofauna during the studied period. Salmonoidei (salmonoid fishes) – grayling and brown trout – were the basis of the catch (in terms of the number of caught individuals), which accounted for slightly less than half of all caught fish. The proportion of Salmonoidei in control catches over the entire observation period ranged from 51.6% to 77.3% of the total number, averaging 61.0±2.6%. The proportion of other fish species ranged from 22.7% to 48.4%, on average – 39.0±2.6%. Based on measurements of fish length and body weight, it was determined that in the studied area Salmonoidei are either juveniles or first spawning individuals. In the long-term aspect, the linear trend of catches per effort for brown trout and grayling has a stable upward trend, which allows us to expect an increase in the share of Salmonoidei in catches in the Zimnyaya Zolotitsa river system in the impact area of the Lomonosov diamond deposit.

Keywords: Zimnyaya Zolotitsa River, fish population, biological parameters, relative abundance

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Article published in number 2 for 2025
DOI: 10.25750/1995-4301-2025-2-092-099

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