Swim bladders are one of the important organs of fish, also known as fish bubbles, which are filled with many gases, such as nitrogen, oxygen, carbon dioxide and so on. Through the contraction of the swim bladder, fish can independently regulate the density of their bodies, thus controlling their rise and fall. In addition, when the fish body is hypoxic, the swim bladder can also provide part of the oxygen, which can be said to be an auxiliary respiratory organ. The swim bladder plays a very important role, but not all fish have a swim bladder. Generally speaking, bony fish have swim bladders, while Chondrichthyes basically have no swim bladders.
Sharks are fish that live in the ocean. They belong to the class Chondrichthyes, which is a kind of Chondrichthyes. Sharks do not have swim bladders, they do not control their own rise and fall through the swim bladder, their life activities do not use the swim bladder.
As mentioned above, as cartilaginous fish, sharks do not have swim bladders, so they can not control their own rise and fall through the swim bladder, they can control their own rise and fall through their own movement. Because sharks are denser than water, they will sink all the time when they are not moving, and they will sink to a deeper place in the sea. If they want to rise, they can only rise through their own movement. Sharks themselves are very strong, they swim very fast, so they rise relatively fast. Therefore, the absence of swim bladder will not affect its own life activities.
