On the whole, predators amount to 17% in the basin. Scrapers, gatherers, and predators are presented in the upper reaches of the basin on stony-boulder ground in the tundra and taiga rivers at low water temperatures.
The share of predators is maximal (21%). In lower reaches, at active sedimentation processes and higher temperatures, phytodetritophages are numerous, but the portion of zoophages decreases to 12%.