The bullhead^[1][2][3] (Cottus gobio) is a freshwater fish that is widely distributed in Europe, mainly in rivers. It is a member of the Cottidae family, a type of sculpin. It is also known as the miller's thumb, freshwater sculpin, common bullhead or European bullhead.^[2][3]

The bullhead is a small demersal fish that lives both in cold, clear, fast-slowing small streams and in middle-sized rivers. It also occurs on gravelly shores of cold lakes. Further, it thrives in diluted brackish water of the Northern Baltic Sea.^[2] Its food items include benthic insects and crustaceans.^[2] On reproduction, it attaches its eggs in clumps on undersides of large stones.^[2]

References

1. ^ Cottus gobio IUCN Red List 2009
2. ^ ^{a b c d e} Froese, Rainer, and Daniel Pauly, eds. (2005). "Cottus gobio" in FishBase. 10 2005 version.
3. ^ ^{a b} "Cottus gobio". Integrated Taxonomic Information System. http://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=167255. Retrieved 24 January 2006.