Seahorses take care of their young in a special way. The male is responsible for the eggs.
With fish, the fertilized eggs usually have to manage themselves. But with seahorses the male takes care of the eggs, until they hatch. After a complicated mating dance, the female lays her eggs in a sort of pouch that the male has on his belly.
This happens when the prospective parents twist the tails together. The pouch is lined with soft tissue that swells and resembles a uterus once the male has received and fertilized the eggs.
The breeding time varies from 9 to 45 days per sea horse. Then the male is waiting a tough time. He makes a hole in the pouch and squeezes the boy, small copies of adult seahorses, out of his stomach by pulling his abdominal muscles a number of times - sort of contractions.
A male usually gives birth to 100 to 300 young. But for the smallest species the number of young is five - and larger species sometimes get 2000. The young are 2 to 20 millimeters long when they come out of the pouch. And then they are left to themselves, because here the male's care stops.