The population status of pikeperch, Sander lucioperca (Linnaeus, 1758), in the Kuibyshev Reservoir (2000–2018)
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The population status of pikeperch, Sander lucioperca (Linnaeus, 1758), in the Kuibyshev Reservoir (2000–2018)

V.G. Tereshchenko a*, F.M. Shakirova b**, V.Z. Latypova c,d***, N.Yu. Stepanova c***, O.K. Anokhina b*****

aPapanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, 152742 Russia

bRussian Research Institute of Fisheries and Oceanography, Tatar Branch, Kazan, 420111 Russia

cKazan Federal University, Kazan, 420008 Russia

dResearch Institute for Problems of Ecology and Mineral Wealth Use of Tatarstan Academy of Sciences, Kazan, 420087 Russia

E-mail: *tervlad@ibiw.yaroslavl.ru, **shakirovafm@gmail.com, ***ryvenera@yandex.ru, ****step090660@yandex.ru, *****nanohin@mail.ru

Received December 17, 2019

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DOI: 10.26907/2542-064X.2020.3.445-460

For citation: Tereshchenko V.G., Shakirova F.M., Latypova V.Z., Stepanova N.Yu., Ano­khina O.K. The population status of pikeperch, Sander lucioperca (Linnaeus, 1758), in the Kuibyshev Reservoir (2000–2018). Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2020, vol. 162, no. 3, pp. 445–460. doi: 10.26907/2542-064X.2020.3.445-460. (In Russian)

Abstract

The population status of pikeperch, Sander lucioperca (Linnaeus, 1758), in the Kuibyshev Reservoir was studied for the period from 2000 to 2018. The species is the dominant predator here. The monitoring was based on data on the dynamics of the population size and generations, as well as changes in the age structure, growth rate, and mortality. The obtained results reveal that the pikeperch population oscillated around an equilibrium state in 2000–2007. During this period, its size varied insignificantly. Subsequently, the abundance of specimens increased, and the population became even more balanced, which has been observed up to date. The index of population wellbeing in the equilibrium states has remained unchanged throughout the two decades. However, some negative tendencies have taken place over the past 10 years: an increase in the fishing pressure and a reduction in the number of older specimens in the catches. The approach used in this study should be helpful for assessing the status of fish populations, promoting sustainable fish stock exploitation under the conditions of unstable hydrological regime of reservoirs and weak control over fishing in the conservation of fish resources.

Keywords: pikeperch (Sander lucioperca), Kuibyshev Reservoir, population, dynamics, structure, status monitoring

Acknowledgements. We are grateful to A.O. Mostryukov, Candidate of Physical and Mathematical Sciences (Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia), for designing the Phase 1.0 and Phase 1.1 data processing programs that were used in the construction of a dynamic phase portrait of the actual population and hydrobiont community.

The study was supported by the Russian Foundation for Basic Research and by the Government of the Republic of Tatarstan (as part of research project no. 18-44-160023).

Figure Captions

Fig. 1. Dynamics of pikeperch catches in the Kuibyshev Reservoir.

Fig. 2. Schematic map of the Kuibyshev Reservoir and the ichthyological stations, ▲ – sampling site.

Fig. 3. Dynamics of the pikeperch population in the Kuibyshev Reservoir (а) and its dynamic phase portrait (b): 1 – source data; 2 – smoothed data; 3 – reference state; 4 – direction of movement; 5 – population status in year given along the curve line; 6 – stable state; 7 – critical point in functioning.

Fig. 4. Linear growth of pikeperch in the Kuibyshev Reservoir during the following periods: 1 – 2000; 2 – 2010; 3 – 2018; 4 – 1960 according to [27].

Fig. 5. Increase in the pikeperch body weight during the following periods: 1 – 2000; 2 –2010; 3 – 2018; 4 – 1960 according to [27].

Fig. 6. Equilibrium age structure of the pikeperch population in the Kuibyshev Reservoir: 1 – 2000–2007; 2 – 2011–2018.

Fig. 7. Averaged age structure of the pikeperch population in the Kuibyshev Reservoir during 2000–2018 (1) and the approximation function of the equilibrium age structure (2).

Fig. 8. Relative abundance of specimens in the pikeperch generations that emerged in the Kuibyshev Reservoir during 1992–2018.

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