Journal of Siberian Federal University. Biology / Biology, Stock Structure and Fisheries of Pikeperch Sander lucioperca (Linnaeus, 1758) in the Kama Reservoir (Perm Krai, Russia)

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Issue
Journal of Siberian Federal University. Biology. 2023 16 (3)
Authors
Kazarinov, Semyon N.; Komarova, Lidiya V.; Ponosov, Stanislav V.; Merzlyakov, Igor N.; Mikheev, Pavel B.
Contact information
Kazarinov, Semyon N.: Perm Branch of the FSBSI “VNIRO” Perm, Russian Federation; ; ORCID: 0000-0003-1732-7459; Komarova, Lidiya V.: Perm Branch of the FSBSI “VNIRO” Perm, Russian Federation; Perm State University Perm, Russian Federation; ORCID: 0000-0001-8703-8594; Ponosov, Stanislav V.: Perm Branch of the FSBSI “VNIRO” Perm, Russian Federation; ORCID: 0000-0001-8703-8594; Merzlyakov, Igor N.: Perm Branch of the FSBSI “VNIRO” Perm, Russian Federation; ORCID: 0000-0002-6372-2444; Mikheev, Pavel B.: Perm State University Perm, Russian Federation; Khabarovsk Branch of the FSBSI “VNIRO” Khabarovsk, Russian Federation; ORCID: 0000-0002-0934-6935
Keywords
pikeperch; growth; size and age structure; von Bertalanffy growth curve; length-weight relationships; relative condition factor; bycatch; gillnet selectivity; recruitment; population structure
Abstract

The aim of the present study is to analyze biology and fisheries of pikeperch in three areas of the Kama reservoir, which is one of the largest in Russia. The age structure, length, and mass in age groups, mass–length relationship, as well as specifics of harvesting of pikeperch stock were analyzed. The materials used for the study were collected during the seven-year, 2015–2021, gillnet monitoring. For pikeperch inhabiting the Kama reservoir, the study revealed interannual dynamics of the age structure and recruitment abundance. This may indicate the interannual variability of spawning conditions and fluctuations of factors affecting the mortality of pikeperch juveniles in the reservoir. Also, differences in growth and relative condition factor of fish from different parts of the reservoir were found, suggesting the existence of spatially separated groups of pikeperch adhering to certain feeding areas within the reservoir. Comparison of the linear growth curves of pikeperch of the Kama reservoir with those for the reservoirs of the Volga-Kama cascade suggested that in the Kama reservoir the conditions for feeding of juveniles are more favorable, but the conditions for adult fish feeding are less favorable. In addition, the results indicate interannual differences in the length of fish in age classes and the character of length-weight relationships, which may also indicate the interannual dynamics of feeding conditions. We suggested the method for calculating the possible value of pikeperch harvest by unregulated and unreported fisheries. The approach used in the study shows that the volume of possible unaccounted catches exceeds the official data by a factor of 3 to 5. The information obtained in the current study suggests the existence of separate stocks of pikeperch within the Kama reservoir and the variability of factors determining the recruitment and feeding conditions of the species. The results are important for understanding the population structure of pikeperch within large water bodies and for managing pikeperch fisheries

Pages
363–385
EDN
MUXSVS
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/151780

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