1, swordfish, such as red sword, green sword and golden head sword.

2, crane-billed fish, common are golden crane-billed fish and very common crane-billed fish.

3, guppies, this kind is also known as red peony, and Moscow blue.

4, moon fish, common red sun and so on.

5. In addition, there are red wings and piano tails.

The reproduction mode of viviparous fishes and mammals is in vivo fertilization. However, the fundamental difference between them is that mammalian fetuses rely on maternal nutrition to maintain their lives, while ovoviviparous fishes rely on vitellin from fertilized eggs in their mothers to maintain their lives.