Modeling of identification descriptors sets to create a morphological passport of a population common pike Esox lucius L., 1758, Dnieper-Bug canal

The purpose of the study is to introduce a methodological approach to the use of morphometric information to create a morphological passport of the common pike Esox lucius L., 1758, based on five plastic parameters. Based on the study of parameters such as the sum of the ratios of the length from the tip of the snout to the vertical from the base of the ventral fin, the width, height and girth of the pike's body to the length of its body from the tip of the snout to the end of the scaly cover, calculations were carried out and a set of identification descriptors underlying the morphological passport of the common pike (population of the Dnieper-Bug canal) by age groups from underage to five-year-olds. The obtained values of the ratios based on the results of five morphometric measurements can be taken as the basis for the identification of the common pike of the Dnieper-Bug Canal as a separate biological species, taking into account the age group and gender (for two-year-olds and older age groups), and the allometry factor underlying the calculations of plastic features during ontogenesis. An array of relevant identification descriptors of the population of the studied species has been formed, and the main trends of their changes by age groups have been analyzed.