Seahorses belong to the fish.

Seahorses have a laterally compressed head, with 2 nostrils on each side of the head, the head is bent at nearly a right angle to the body, and the body is thick and laterally compressed, completely encased in a bony ring; the mouth is a pointed tube, the mouth can not be opened and closed, and therefore can only suck small animals in the water for food, the eyes can be separately to the up and down, left and right, or before and after the rotation of the eyes; thorax and abdomen protruding, the carapace is made up of 10-12 knuckles of the bone ring, and the general length of the body is 15-30 centimeters. The general body length is about 15-30 centimeters.

The tail is elongated and four-angled, with a fine pointed end that can be curled and held, often in a curled shape; the head is curved, at a large obtuse or right angle to the trunk, with a prominent crown at the top and small spines at the end of the crown; the muzzle is tubular; the mouth is small and telic; the gill pores are small; and the whole body is completely wrapped in membranous bony plates, with a spine-less dorsal fin, and without a ventral fin or a caudal fin.

Expanded Information:

Breeding of seahorses:

March to August age (body length 4.5 cm to 6.5 cm) reaches sexual maturity, is a multiple spawning type, a few to a dozen litters per year, each litter dozens of tails to hundreds of tails, the number of the first litter is relatively small, and then increased litter by litter. The reproductive period in the South China Sea is from April to November, with June to September as the peak period, and the Yellow Sea and Bohai Sea from May to July, during which the water temperature is 20℃ to 28℃.

Mating is usually carried out in the early morning, the early stage of oestrus, male and female seahorses in pairs chasing each other, or side by side with each other swimming, the body surface of the original melanin contraction, turned yellowish-white; the climax of oestrus, male and female seahorses mating, this time with the body belly close to male seahorses open the mouth of the nursery capsule, so that female seahorses of the reproductive papilla inserted into the and spawn in it.

At the same time, he rapidly expelled his own sperm into the sac, and the whole process took about 1 minute. The eggs are fertilized in the brood pouch, the embryonic bodies of the fertilized eggs hatch and demembranate in the brood pouch, and the demembranated larvae spend the larval stage in the brood pouch.

Baidu Encyclopedia - Seahorse (marine ichthyoplankton)

Baidu Encyclopedia - Japanese seahorse