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Abstract <p>An analysis of long-term data on the relative abundance, sexual maturation, linear growth and age structure of the European grayling <i>Thymallus thymallus</i> (Linnaeus, 1758) living in one of the watercourses of the middle Timan in the area of bauxite mining and transportation, is presented. It is shown that in the absence of significant disturbances to habitats, the dynamics of abundance and structural and functional parameters of the grayling aggregations are determined to a greater extent by the intensity of non-commercial fishing than by climatic conditions. If the exploitation load is reduced and the quality of the aquatic environment is maintained, the grayling population in the Vym River can be expected to restore to the level characteristic of undisturbed aggregations of this fish species.</p>

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Dynamics of Abundance and Biological Parameters of the European Grayling Thymallus thymallus (Salmonidae: Thymallinae) of the Timan Watercourse According to Long-Term Observations

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • E. I. Boznak,
  • A. B. Zakharov

摘要

Abstract

An analysis of long-term data on the relative abundance, sexual maturation, linear growth and age structure of the European grayling Thymallus thymallus (Linnaeus, 1758) living in one of the watercourses of the middle Timan in the area of bauxite mining and transportation, is presented. It is shown that in the absence of significant disturbances to habitats, the dynamics of abundance and structural and functional parameters of the grayling aggregations are determined to a greater extent by the intensity of non-commercial fishing than by climatic conditions. If the exploitation load is reduced and the quality of the aquatic environment is maintained, the grayling population in the Vym River can be expected to restore to the level characteristic of undisturbed aggregations of this fish species.