Is the seahorse a fish? Why was it born by my father

After mating, the female will inject the egg into the male accessory sac, and then the male will fertilize it. Fertilized eggs are kept in the abdominal sac until the hippocampus is developed, and they can be discharged from it. So it looks like it was born by my father, but in fact it just hatches in the male's body. It is worth mentioning that although its shape is not like fish, it is a real fish. 1、 Why is the hippocampus born to a father? Only males have abdominal sac, that is, parenting bag, but females don't. After mating, the female will release the eggs into the abdominal sac, while the male is responsible for fertilizing the eggs and keeping the fertilized eggs until they are developed and formed, and then release them. It feels like they were born by the male. But in fact, it is not really born by the father, but hatched in the pouch. 2、 Are seahorses fish? Seahorses are fish. Although its shape is very different from that of traditional fish, it is an authentic bony fish with complete dorsal and caudal fins. Another feature can be proved, that is, it breathes with its gills and will die once it leaves the water. 3、 Morphological characteristics of hippocampus the length of hippocampus is generally between 5-30 cm. Its head is curved and close to the body. Its body is flat on its side, and its mouth is tubular and cannot be closed. It usually feeds on small animals in the water. Its chest and abdomen protrude, its trunk has 10-12 bone rings, and its tail is slender and quadrangular. 4、 The growth habit of seahorses is very special. Their tails are usually curled and wound around the stems of seaweed. Occasionally, they hang upside down and float on other objects. When you need to eat, you usually leave the entangled object, but soon look for other objects to attach to. Standing upright in the water, the swimming posture is very beautiful. It can swim a long distance slowly by relying on the high-frequency swing of dorsal fin and pectoral fin. （HaiMaShiYuLeiMa，WeiShenMeShiBaBaShengDe）