Sharks are very large and fierce fish in the ocean. In the course of studying them, some researchers have found that sharks swim all the time and never stop. This is very different from other animals, including human activities. Specifically, there are two reasons why they can't stop:
1. Stay suspended: Sharks are a kind of cartilaginous fish, and the body structure of cartilaginous fish and bony fish is very different. Bony fish generally use inflatable swim bladders to maintain the state of suspension in the water, but cartilaginous fish can not. As a kind of cartilaginous fish, sharks can only maintain suspension and swimming by means of their fin activities. Their fin structure is also quite unique, similar to the wings of aircraft, are curved above and flat below. This configuration allows the shark to keep swimming forward and remain suspended. If they stop swimming, their bodies sink.
2. Prevent suffocation: In addition, sharks do not have gill covers, so they can only keep swimming to allow water to pass through the gills, otherwise they will suffocate, and may die in serious cases.
As mentioned above, sharks can't stop, and one of the reasons is to prevent suffocation. The body structure of sharks is quite different from that of other fish. They have no gill cover. Therefore, if they stop swimming, water will not be able to pass through their gills, which may cause them to suffocate, which may lead to their death for a long time.
