The current state of natural reproduction and prospects of artificial reproduction of european carp of the Urals-caspian population in the middle reaches of the ural river

摘要

The article presents the results of studying the reproduction of the native species of European carp of the Ural River passing through the territory of the West Kazakhstan region. In recent years, there have been fluctuations in the hydrological conditions of the Ural River, as well as a decrease in the annual runoff. Changes in the climate harm the ecosystem of the river as a whole, which results in changes in the fish fauna, as many species leave their customary habitat due to a reduction in the number of natural spawning locations, lack of food, and changes in the hydrochemical composition of the water. According to the results of these studies, the age structure of the caught carp spa tvners has been determined, and the results of the biologicalfish-breeding parameters have been obtained, such as the weight, the length of the entire fish, the length to the end of scale covering, the greatest body height, Fulton's condition factor, the working fecundity, and the relative working fecundity. Theresults of the hydrochemical analysis of the samples of water from the middle reaches of the Ural River are presented. The results of studying the morphological and biochemical composition of the blood of spawners used for reproduction have been obtained. The following rnorphological and biochemical parameters have been determined: concentrations of haemoglobin, total protein, glucose, cholesterol, and triglyceride. Artificial reproduction of European carp was performed using a trailer-based mobile hatchery with the use of the water from the natural water body, the Ural River.