Experimental investigations of feeding conditions influence of roach larvae on their motion activity during active movement into the current

Changes in the composition and density of salmonid juveniles community in the river continuum of a small mountain-tundra tributary are investigated. Influence of different biotic and abiotic environmental factors on the state of salmonid juveniles community is discussed. A high importance of tributaries in formation of replenishment of salmonids population and support of their biodiversity.