Hydroacoustic studies of the structure of the Baikal omul feeding stock in the Selenga shallows of Lake Baikal

Authors

  • Anoshko P.N. 1 ID
  • Dzyuba E.V. 1 ID
  • Khanaev I.V. 1 ID
  • Kucher K.M. 1 ID
  • Nebesnykh I.A. 1 ID
  • Makarov M.M. 1 ID
    • 1 Limnological Institute Siberian Branch of the Russian Academy of Sciences, 3 Ulan-Batorskaya Str, 664033, Irkutsk, Russia

DOI:

https://doi.org/10.31951/2658-3518-2024-A-5-1302

Keywords:

Baikal omul, hydroacoustic method, test trawling, length-at-age data, length-weight relationship, stock assessment, Lake Baikal

Abstract

A comparative analysis of hydroacoustic data from 2011 to 2024 allowed us to determine the distribution characteristics of Baikal omul in the spring in the water area of the Selenga shallows under a significant decrease in stocks. Test trawling provided analysis of the length-at-age data on Baikal omul, revealed an increase in the stock abundance owing to the 2019-2023 generations, and confirmed the possibility of the correct use of the length-weight relationship (LWR), W=10.9(SLdm)3.02, based on long-term data. The obtained data predict a growth of biomass, as a more inert indicator, in four-six years. To formulate a more accurate forecast, it is necessary to adjust the natural mortality rates.

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Published

2024-10-31

Issue

2024: №5 (October)

Section

Articles

License

Copyright (c) 2024 Limnology and Freshwater Biology

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Creative Commons License
This work is distributed under the Creative Commons Attribution-NonCommercial 4.0 International License.