Why does crucian carp always jump on the water when it throws seeds?

Mainly because the males chase each other for the females.

During the spawning season, crucian carp will cast seeds. Before ovulation, the mature female fish will release information to lure the male fish to chase, hit her abdomen with her head, and the male fish will excrete semen at any time.

Crucian carp seed throwing is still in a specific environment, and the probability in the north is around May. Due to the low environmental temperature in the north, the water environment where fish live is cold, and it takes a long time to lay eggs. If the corresponding temperature is not reached, it will not be able to lay eggs well.

In the south, it is very likely that crucian carp will start sowing in March-April, because the temperature in the south is generally high and crucian carp will change with the change of water temperature. When the temperature is higher, it is more beneficial for crucian carp to lay eggs and arrange seeds.