Males are usually distinguished from females by the larger ventral fin. Three sub-species with slightly different scale patterns are recognized. Reproduction Carp generally spawn in the spring and early summer depending upon the climate. Carp segregate into groups in the shallows to spawn. Carp prefer shallow waters with dense macrophyte cover.
Males externally fertilize eggs, which the females scatter over macrophytes in a very active manner.
The eggs stick to the substrate upon which they are scattered. Incubation is related to water temperature and has been documented at three days at temperatures of 25 to 32C. Fry average 5 to 5.5 mm in total length. Temperature, stocking density, and availability of food influence individual growth. By the time the fish reach 8mm the yolk has disapeared and they begin to actively feed. The Common Carp's unique method of feeding has very important ecological implications.