[zhitoman]

Technically they are different species, originally therm crucian carp was applied to gold crucian carp. In Europe there are two species of crucian carp, gold crucian carp and asian silver crucian carp. Goldfish are domesticated silver crucian carp. The thing is, those fish hybridize so much, it's not really possible to tell which one is a pure crucian now. You can trust me, I caught both species.