Fish swim in the water by their tails, which can provide power by swinging their tails. A fish without a tail is unable to move forward and can only float in the water. But there are also some strange fish, such as manta rays or rays, which can move by swinging their pectoral fins, and their tails are mainly responsible for changing the direction of swimming.
In addition to the tail can provide power, for fish, another role is to maintain balance, so that they can swim when the body is stable, will not appear wobbly situation. But it's not just the caudal fin that's balanced, it's also the pectoral, pelvic, anal and dorsal fins, whichever one you lose, and the fish will lose its balance.
For some fish, the tail is their expression of the artifact, usually this kind of fish's tail is particularly beautiful, especially the male, such as guppies. In the breeding season, the male fish will swim in front of the female fish, the tail will be tightened and relaxed, in order to obtain each other's favor, so as to be able to mate and reproduce.
For some fish, the tail is also a weapon to protect themselves, such as the stingray, their body is very flat, the tail is thin and long, there are poisonous spines on it, when they encounter danger, they will use their tail to attack the enemy. It is worth mentioning that its stinger has a barb in the front section, which is difficult to remove once it enters.
