Ichthyofauna of the Dereviannoe lake (Balkhash watershed)

Abstract

Abstract. The irrational use of fish resources, intensive development of agricultural land, anthropogenic impact, and processes of acclimatization have a significant influence on the aquatic ecosystems.
As a result of the complex influence of negative impacts, the species composition of the ichthyofauna of
water bodies undergoes significant changes, which leads the aquatic ecosystem to the chaos.
In recent years, with the development of fisheries and aquaculture in the country, great importance
is attached to the protection and rational use of fish resources. In connection with this, work is underway
in the republic to study the ichthyofauna of especially important reservoirs in fisheries. However, sec-
ondary water reservoirs, such as small and reserve, remain insufficiently studied, whereas such reservoirs
can serve not only as a reserve for valuable commercial species, but also for the commercial cultivation
of fish products.
Lake Dereviannoe, located in the desert of Karabastau, in the Uighur district of Almaty region. In
2018, the expeditionary detachment was first examined. The aim of the study was to study the condition
of the ichthyofauna of the reservoir. The study revealed that the ichthyofauna of the lake is represented
by 14 species of fish belonging to 4 families: Cyprinidae – Cypriniformes, carpophages – Cyprinidontiformes, catfish – Siluriformes and percids – Perciformes. The composition of the ichthyofauna was
represented both by native and alien species. The proportion of alien species exceeded the aboriginal
ichthyofauna, but in terms of numbers, native species predominated.
Key words: ichthyofauna, aboriginal, acclimatized, species, fish.