Crucian Carp

The Crucian Carp is native to still and slow-moving waters across Europe, from England to the Ural Mountains. It is perhaps the most cold-tolerant freshwater fish in the world, able to survive months trapped under ice through anaerobic metabolism — producing alcohol as a by-product instead of toxic lactic acid.

In the aquarium Crucian Carp are peaceful, undemanding, and longlived. Juveniles are attractively deep-bodied and golden-bronze in colour. They are best appreciated in a large aquarium or pond biotope replicating a European lake or oxbow.

This species is a true conservation interest, as pure Crucian Carp are increasingly rare in the wild due to hybridisation with Goldfish and Prussian Carp. Keeping pure-strain fish supports awareness of the species.