Abstract
Characteristics of feeding of blunt-snouted lenok Brachymystax tumensis in the mountain moraine Korbokhon Lake (Left Bureya River, Khabarovsk krai) in summer is presented. It was established that individuals at an age of 3+ to 13+ use all accessible seasonal types of preys both near bottom and in surface water layers as food. In total the contents of all studied stomachs, 88 components of animal origin (bottom invertebrates, lenok roe, larvae, pupae, and imagoes of aquatic and terrestrial insects), as well as three plant components, were found. With age, the spectrum of feeding of lenok widens. In stomachs of individuals at an age of 9+ to 13+, besides invertebrates, bearded stone loach Barbatula toni and fur small murine rodents were recorded. Selectivity of feeding with respect to weight and type of preys was revealed: lenok older than 9+ prefers larger food items; individuals at an age of 11+ to 12+ more frequently include beetles and other terrestrial insects in the diet, and the ratio of aquatic and terrestrial food items changes in favor of the latter.
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