On this Wikipedia the language links are at the top of the page across from the article title. Crucian carp” is also used crucian stuffing the genus Carassius as a whole.

It occurs widely in northern European regions. Arctic Circle in the Scandinavian countries, and as far south as central France and the region of the Black Sea. Its habitat includes lakes, ponds, and slow-moving rivers. It has been established that the fish is native to England and not introduced. The crucian carp is also the type species for the genus, which has led to confusion in the taxonomy of species native to East Asia. There are reports of hybridisation between the crucian and domestic or feral goldfish, which has been verified by production of viable hybrids in laboratory conditions.

The variation in shape of a crucian carp can be very high. When cohabiting waters where predatory fish are present, there occurs an induced change in the morphology of the population from a sleek-bodied form to a deep-bodied form, which makes it difficult for predator fish to fit the crucian carp within its jaws. Carassius species exhibit some remarkable physiological adaptations to their environment. In Britain, leisurely or competitive catching of this fish by rod and tackle belong in the coarse fishing category. Martin Bowler in 2003, tied by Joshua Blavins in 2011.