Morphophysiological index of the Perca fluviatilis heart of lake Stolbovoe

This article discusses the results of studying the morphophysiological index of the heart of Perca fluviatilis. The catch of the common perch was carried out from Lake Stolbovoye in the Altai region of the Republic of Khakassia in June 2022. Perca fluviatilis is one of the dominant species in Lake Stolbovoye. A comparative analysis of the heart index among females and males is also presented. The information and this site are new to the study.