Sharks will soon die after their fins are cut off. Its shark fin is actually a fish fin, because it is a cartilaginous fish, there is no swim bladder in the body, so it must keep swimming to maintain buoyancy, lose the fin it can only die. The reason why sharks whose fins have been cut off are put back into the sea is that their meat is not delicious, and only shark fins have economic value, so they are put back, but they will die when they go back.
1. Cartilaginous fish: Existing fish are currently divided into two major categories, one is bony fish, and the other is Chondrichthyes. Sharks are the representatives of Chondrichthyes, and it is precisely because their endoskeleton is composed entirely of cartilage and there is no real bone tissue that all fish fins are made into shark fins. At the same time, their exoskeleton is not developed.
2. Replacement of teeth: One of the most interesting characteristics of sharks is the replacement of teeth. Many animals will change their teeth in the process of growth, but only sharks can change their teeth all their lives. But in fact, for sharks, it is not a real sense of teeth, but a derivative of similar scales.
3. No swim bladder: Sharks do not have a swim bladder. As we all know, fish use the swim bladder to regulate the gas in the body, so as to achieve the purpose of floating up and diving. Sharks do not have a swim bladder and rely on the liver to control it. Moreover, it must always swim, and when it stops, it will sink to the bottom of the sea.
