A shark will die soon after its fins are cut off. Its fins are actually fins, and since it is a cartilaginous fish with no swim bladder in its body, it has to keep swimming to maintain its buoyancy, and without its fins it can only die.

Shark characteristics:

1, cartilaginous fish: the existing fish is currently divided into two categories, one is a hard bone fish, a cartilaginous fish, sharks are cartilaginous fish in the representative, but also because of its endoskeleton is composed entirely of cartilage, and there is no real bone tissue, all the fins will be made into a shark fins, and at the same time, it is the exoskeleton is not developed.

2, teeth replacement: the shark is one of the most interesting features than the teeth, many animals in the process of growth will change teeth, but lifetime can change teeth only a shark. In fact, however, for sharks, it is not the real meaning of tooth replacement, but a derivative similar to the scales.

3, no swim bladder: sharks do not have a swim bladder, as we all know, fish through the swim bladder to regulate the gas in the body, so as to achieve the purpose of floating and diving, sharks do not have a swim bladder, relying on the liver to control. Moreover, it must swim all the time, and once it stops it will sink to the bottom of the sea.