Cottus koshewnikowi

Cottus koshewnikowi, Koshewnikow's sculpin, is a species of freshwater ray-finned fish belonging to the family Cottidae, the typical sculpins. It inhabits the upper Volga drainage in Russia and drainages of the northern and eastern Baltic Sea from Estonia eastward and northward to Finland and northern Sweden. In coastal waters of the Northern Baltic Sea it forms hybrid populations with the more western bullhead species Cottus gobio (sensu stricto).

Cottus koshewnikowi
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Perciformes
Suborder:	Cottoidei
Family:	Cottidae
Genus:	Cottus
Species:	C. koshewnikowi
Binomial name
Cottus koshewnikowi Gratzianov, 1907
Synonyms
Cottus gobio microcephalus Kessler, 1868 Cottus gobio milvensis Soldatov, 1924

It reaches a maximum length of 10 cm (3.9 in).^[2] It prefers medium-sized rivers to small streams, and lake shores.