Influence of environmental conditions on the heart index of Perca fluviatilis (Krasnoyarsk reservoir)

The paper considers the results of the analysis of the morphophysiological index of the heart of Perca fluviatilis, which was caught in the winter of 2021 in the Krasnoyarsk reservoir (Krasnoyarsk Territory). Attention is paid to the dependence of the value of the heart index on the state of the environment and the assessment of the quality of the reservoir. A description of the reservoir (the Yenisei River basin) is also provided. The information and the location are new to research.