ҚАПШАҒАЙ СУ ҚОЙМАСЫНДАҒЫ ҚАРАКӨЗ RUTILUS CASPICUS (YAKOVLEV 1870) ПОПУЛЯЦИЯСЫНЫҢ ҚҰРЫЛЫМДЫҚ ЖӘНЕ КЕҢІСТІКТЕГІ ТАРАЛУ ЕРЕКШЕЛІКТЕРІ

N.S.  Sapargaliyeva; S.E.  Sharakhmetov; Zh.M.  Bakkozha; А.Т.  Satbek

doi:10.26577/bb107220265

Authors

N.S. Sapargaliyeva Al-Farabi Kazakh National University, Almaty, Kazakhstan https://orcid.org/0000-0001-5628-9470
S.E. Sharakhmetov әл-Фараби атындағы Қазақ ұлттық университеті, Алматы, Қазақстан https://orcid.org/0000-0001-7278-5351
Zh.M. Bakkozha Al-Farabi Kazakh National University, Almaty, Kazakhstan https://orcid.org/0000-0001-9580-9483
А.Т. Satbek Al-Farabi Kazakh National University, Almaty, Kazakhstan https://orcid.org/0009-0000-5259-4945

DOI:

https://doi.org/10.26577/bb107220265

5 4

Keywords:

Kapshagay reservoir, roach, age series, size-age indicators, sex composition, distribution, interpolation.

Abstract

The article presents the structural features of the roach population in the Kapchagay Reservoir (age composition, size weight indicators, sex composition) based on ichthyological studies in 2024. The length of these captured individuals ranged from 89 to 323 mm and averaged 193 mm. Weight varied from 11 to 622 g with an average of 163 g. The roach was, in fact, two to eight years of age, but most were four to six years old.

Size structure analysis showed the modal length size classes of 150–209 mm and 200–249 mm to be most common and weight size classes of 120–179 g and 180–239 g to be most common. The high frequency of roach catches in the scientific nets (30 mm mesh) supports these findings. In recent years, we have been observing positive trends concerning the structural characteristics of the roach population in the reservoir.

Catches were studied and showed an increase in the roach from spring to autumn. The interpolation method was used to analyze its seasonal spatial distribution, which is the population. In spring, roach was overwhelmingly located in the right bank water area of the reservoir; in summer and autumn, nearly all were in the river mouth region of the left bank. In these regions, this distribution pattern is probably influenced by food resource availability and different abiotic factors.

Author Biographies

N.S. Sapargaliyeva, Al-Farabi Kazakh National University, Almaty, Kazakhstan

Sapargaliyeva Nazym – candidate of biological sciences, Associate Professor of the Department of Zoology, Histology, and Cytology, Al-Farabi Kazakh National University (Almaty, Kazakhstan, e-mail: sapargalyeva.nazym@gmail.com)

S.E. Sharakhmetov, әл-Фараби атындағы Қазақ ұлттық университеті, Алматы, Қазақстан

Sharakhmetov Sayat – PhD, Associate Professor-Researcher of the Department of Zoology, Histology, and Cytology, Al-Farabi Kazakh National University (Almaty, Kazakhstan, e-mail: sharakhmetov@gmail.com)

Zh.M. Bakkozha, Al-Farabi Kazakh National University, Almaty, Kazakhstan

Department of Zoology, Histology, and Cytology, Al-Farabi Kazakh National University, Research Fellow of the Ichthyology Laboratory LLP «Fisheries Research and Production Center» (Almaty, Kazakhstan, e-mail: zarkynbakkoza@gmail.com)

А.Т. Satbek, Al-Farabi Kazakh National University, Almaty, Kazakhstan

Bakkhozha Zharkyn – 1st year doctoral student of the Satbek Angsar – 2nd year doctoral student of the Department of Zoology, Histology, and Cytology, Al-Farabi Kazakh National University, (Almaty, Kazakhstan), Head of the expeditionary unit of the integrated fisheries laboratory, Balkhash branch LLP «Fisheries Research and Production Center» (Balkhash, Kazakhstan, e-mail: a.s_9393@list.ru)