BIOLOGY OF PREDATORY FISH OF THE TOBOL RIVER

Abstract

The article presents the species composition, the main biological indicators, the current state of predatory fish living in the Tobol river. The material was collected in 2016-2020 as a result of field trips. 6 stations on the Tobol River were surveyed. According to the research results, the total number of fish
species in the Tobol River was 13 species, of which 4 species are northern pike (Esox lucius L.), river perch (Perca fluviatilis L.), sander (Sander lucioperca L.), burbot (Lota lota L.) – a predator. All 4 species of predatory fish are commercial, only 2 species have a high number and are widely distributed: river perch and northern pike. According to the results of the study, the average length of the northern pike was 37.81 cm, the average weight was 666.32 g, the Fulton beetle was 1.27, the average length of the river perch was 15.3 cm, the average weight was 79.96 g, the Fulton beetle was 2.17. The life expectancy of the northern pike and river perch was 5+ years. The current state of the populations of these species on the Tobol River is satisfactory. Northern pike and river perch can be used for organizing sports and amateur fishing on the Tobol River and its floodplain reservoirs.