Fish bubbles, also known as swim bladders, swim bladders are what are commonly known as fish bubbles and contain air that allows the fish to regulate the density of its body and rise or sink in the water. Most of the bony fish that live in the upper and middle layers of seawater have swim bladders. The swim bladder occupies about 5% of the body. Its shape can be ovoid, conical, dirty, horseshoe and so on. The gases in the swim bladder are mainly oxygen, ammonia and carbon dioxide, with oxygen being the most abundant. Therefore, in an oxygen-deficient environment, the swim bladder can be used as an auxiliary respiratory organ to provide oxygen for the fish.

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