The modern condition of rainbow trout Parasalmo mykiss from the Kolsai lakes

Abstract

In order to increase the fish productivity of water bodies and the rational use of aquatic animals in
Kazakhstan, acclimatization events have been repeatedly held. Acclimatization work touched almost all
the reservoirs of the republic, including the mountain. The peculiarity of abiotic indicators of mountain
reservoirs impoverishes the species diversity of aquatic organisms, and in order to increase biodiversity
and rational use of the reservoir, rainbow trout was brought. In the middle of the 20th century, rainbow
trout from reservoirs was acclimatized to the Kolsay lakes. Currently, several aboriginal species inhabit
the pond, but only rainbow trout is of commercial importance. The paper presents data on the current
state of rainbow trout Parasalmo mykiss (mikizha), analyzed materials for several years. According to
the results of biological indicators, it was revealed that the main dimensional weight indicators remain
stable. The significance of biological traits on the lower Kolsay lake is higher compared to the average
Kolsay. The research catch was both young and old-aged individuals of fish, large individuals are not
found annually. The food supply for fish is sufficient, as evidenced by the data on fatness.
Key words: acclimatization, rainbow trout, Kolsay lake, native species, biological features