Crossbreeding - obtaining offspring from producers belonging to different breeding groups (breeds, intra-breed groups, etc.).

Hybridization of fish - crossbreeding of forms that differ in origin or habitat. It is carried out between species, genera, separate cultural breeds of carp, etc. It is used to breed new breeds and to utilize the improved qualities of the first generation hybrids.

For example, in order to breed highly productive fish adapted to the harsh conditions of the northern regions, crossbreeding of cultured carp with wild carp from the Amur basin, characterized by high winter resistance, has been carried out. The hybrids from this crossing significantly surpass mirror and scale carps in terms of viability (high winter resistance, lower susceptibility to diseases, etc.).