What is another word for swim bladders?
Pronunciation: [swˈɪm blˈadəz] (IPA) 
Swim bladders, also known as gas bladders, are a common feature in many fish that allow them to control their buoyancy and maintain their depth in the water. However, there are other terms used to describe these organs in certain species of fish. For example, in some species of herring, the swim bladder is called the sound bladder and is responsible for producing sound waves to communicate with other fish. In sharks and rays, the swim bladder is modified into an oil-filled organ known as the liver, which helps them maintain their buoyancy. Similarly, in eels, the swim bladder has been modified into a respiratory organ for breathing air in oxygen-poor environments. Overall, swim bladders are essential structures that have evolved over time to suit the needs of different species of fish.
