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Comparative Assessment of the Current State of Semi-Anadromous and Non-Anadromous Fish Species in the Northern Part of Agrakhan Bay

  • WATER ECOSYSTEMS OF ARID TERRITORIES
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Abstract

An unfavorable hydrological regime has contributed in recent years to negative changes in the species and age structure of the ichthyofauna in the northern part of the Agrakhan Bay of the Caspian Sea. The article presents the data on the species composition, age categories and morphometric indicators of semi-anadromous and freshwater fish species in detail based on the results of studies in 2019–2021. A comparative analysis of the obtained results with the data of previous years was carried out; negative dynamics of changes in the studied indicators under modern conditions were established. There has been a reduction in the species composition of semi-anadromous fish from 14 to 9 species, the commercially valuable kutum Rutilus kutum (Kamensky, 1901), catfish Silurus glanis (Linnaeus, 1758), vimba Vimba vimba (Linnaeus, 1758), tench Tinca tinca (Linnaeus, 1758) and asp Aspius aspius (Linnaeus, 1758) have disappeared, the share of the remaining surviving species has significantly decreased. The average age has increased, the proportion of fish of older age categories has grown, and, accordingly, the number of younger groups of fish has decreased, which indicates a decrease in growth potential. At the same time, freshwater low-value fish species such as crucian carp Carassius gibelio (Bloch, 1782), rudd Scardinius erythrophthalmus (Linnaeus, 1758), white bream Blicca bjoerkna (Linnaeus, 1758), and others have growth trends in terms of age and morphometric parameters.

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Funding

The study was carried out within the framework of the state task on topic No. 122032200284-2 The Structure of Populations of Commercial Fish Species and the State of Their Food Supply in the Littoral Zone of the Dagestan Coast of the Caspian Sea, as well as within the framework of the postgraduate work of D.M. Ramazanova on the topic The Current State of the Ichthyofauna in the Northern Part of the Agrakhan Bay at the V.N. Tatishchev Astrakhan State University.

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Authors and Affiliations

  1. Tatishchev Astrakhan State University, 414056, Astrakhan, Russia

    L. M. Vasilyeva, A. Z. Anokhina & D. M. Ramazanova

  2. Caspian Institute of Biological Resources of the Dagestan Federal Research Center, Russian Academy of Sciences, 367000, Makhachkala, Russia

    N. I. Rabazanov & R. M. Barkhalov

  3. St. Petersburg State University of Veterinary Medicine, 196084, St. Petersburg, Russia

    N. V. Sudakova

Authors
  1. L. M. Vasilyeva
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  2. N. I. Rabazanov
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  3. N. V. Sudakova
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  4. A. Z. Anokhina
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  5. D. M. Ramazanova
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  6. R. M. Barkhalov
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Corresponding authors

Correspondence to L. M. Vasilyeva, N. I. Rabazanov, N. V. Sudakova or R. M. Barkhalov.

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Conflict of interests. The authors declare that they have no conflicts of interest.

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Translated by L. A. Solovyova

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Vasilyeva, L.M., Rabazanov, N.I., Sudakova, N.V. et al. Comparative Assessment of the Current State of Semi-Anadromous and Non-Anadromous Fish Species in the Northern Part of Agrakhan Bay. Arid Ecosyst 13, 357–362 (2023). https://doi.org/10.1134/S2079096123030162

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  • DOI: https://doi.org/10.1134/S2079096123030162

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