Volga bullhead
(Cottus koshewnikowi)
Cottus koshewnikowi is a species of fish in the family Cottidae. It inhabits the upper Volga drainage and northern and eastern Gulf of Bothnia from Estonia eastward and northward to Finland and northern Sweden. It reaches a maximum length of 10.0 cm.[2] It prefers medium-sized rivers to small streams, and lake shores.
