The Collaborative International Dictionary
Carasius vulgaris
Crucian carp \Cru"cian carp`\ (-shan k?rp`). [Cf. Sw. karussa, G. karausche, F. carousse, -assin, corassin, LL. coracinus, Gr. ????? a sort of fish.] (Zo["o]l.) A kind of European carp ( Carasius vulgaris), inferior to the common carp; -- called also German carp.
Note: The gibel or Prussian carp is now generally considered a variety of the crucian carp, or perhaps a hybrid between it and the common carp.