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In 2017, on the river. Amazar (pool) a dam equipped with a fish passage was built. The success of fish migration depends on a complex of factors, including the adaptive behavior of fish. In this work, using the fish pass as a tool, the timing of fish migration, as well as the required water temperatures, were clarified. In the course of the work, it was established that representatives of the boreal foothill faunistic complex begin the spawning migration and complete the downstream migration. Spawning migration of fish from the river. Amazar of the main commercial fish species runs from the 1st of May until the end of the first decade of June at a water temperature of 5 to 15 °C. Downstream migration from the 10th of September to the end of October at temperatures from 10 to 2 °C. [ABSTRACT FROM AUTHOR]

In modern Russia, there are 27 fish passage facilities. A dam was built on the Amazar River in 2017 and a reservoir was formed. For fish migration, the dam is equipped with a fish ladder. The speed of the current is a determining factor for the passage of fish through the fish passage. The study of the speed regime in the chambers of the fish passage during the spawning migration of fish of different fish species made it possible to establish the speed of water flow (m/s) overcome by the fish in the inflow holes, depending on the size and type of fish. For greater efficiency of the passage of fish through the fish passage, it is necessary to control the flow of water to maintain the best speed regime. [ABSTRACT FROM AUTHOR]