Only the male seahorse has a ventral sac, that is, a pouch, and the female seahorses do not have one. After mating, the female releases the eggs into the abdominal sac, while the male is responsible for fertilizing the eggs and keeping them until they develop and release them as if they were born by the male. But it is not really the father who gives birth to the baby, but the baby is hatched in the pouch.
The seahorse is a fish. Although it looks very different from traditional fish, it is an authentic fish of the class Osteichthyes, and has a complete dorsal and caudal fin. There is also a feature that can be proved, that is, it breathes with gills, once out of water, it will die.
The length of the hippocampus is generally between 5-30 cm, its head is curved, close to the body, the body is flat, the mouth is tubular, can not be closed, usually to suck small animals in water for food. Its chest and abdomen are convex, its trunk has 10-12 bony rings, and its tail is slender and quadrangular.
The habits of seahorses are very special, usually curled tail, wrapped around the stem of seaweed, occasionally hanging upside down floating on other objects. When they need to feed, they usually leave the entangled object, but soon look for other objects to attach themselves to. As a result of upright in the water, so swimming posture is very beautiful, rely on the dorsal fin and pectoral fin of the high-frequency swing to slowly swim out of a distance.
