INFLUENCE OF INVASIVE FISH ON FISH FAUNA MIDDLE IRTYSH ICHTHYOLOGICAL REGION

Abstract

сохранению ABSTRACT Objective: to identify the influence of invasian fish on the ichthyofauna of the Middle Irtysh. Methods: the analysis is based on the author's data from 2013–2018 field studies, the results of earlier studies were published; species assessments and assessments in ecological groups of species by habitat, reproduction and feeding were used. As the main method of analysis, the method of associative rules was used to identify relationships between biological species living in the same territory. Results: the modern ichthyofauna of the Middle-Irtysh region is represented by 35 species of bony fish, of which: 12 are aboriginal species; eight aboriginal species rare; five species are objects of experimental breeding, most of them are invasive species; one species (silver carp) is represented by two ecological forms, one of which is invasive; nine species are invasive, with varying degrees of naturalization. 22 species of fish form a negative associative network, due to the topical and trophic competitive relations between the species. Conclusions: the appearance of invasive species caused a change in the number of a number of native species. As a result of the predominant mining of the Amur carp, the field load on the fish fauna is realized, which contributes to the preservation of a number of native species.