Extension of the range of Amur sleeper Perccottus glenii Dybowski, 1877 (Perciformes: Odontobutidae) in the Yenisei River system

. Amur sleeper Perccottus glenii Dybowski, 1877 is one of the most dangerous invasive fish species in Russia. The modern range of this Far Eastern species extends from Eastern Europe to the water systems of the Far East of Russia, China and Korea. In 2012, Amur sleeper was first registered in the Middle Yenisei system (in the small reservoir on the Bugach River). In the summer of 2019, in order to uncover new locations of Amur sleeper in the Yenisei River basin, 13 water bodies located near the city of Krasnoyarsk were examined. Specimens of Amur sleeper aged between 0+ and 3+ years were found in two ponds. The existence of several generations of Amur sleeper in these water bodies, including both juvenile and mature fish, indicates successful naturalisation of the species. Among the proposed pathways for the invasion of Amur sleeper into these water bodies the most probable one is accidental or intentional introduction by humans.