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Which organs provide buoyancy in cartilaginous fish?

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Most fish use a swim bladder, filled with gas, to keep them from sinking to the bottom of the ocean, as they are usually heavier than the water that they occupy. However, sharks do not ... These are 1) their sizeable livers, filled with an oil that contains squalene, 2) their fins and 3) their cartilaginous skeletons. read more

Bony fish lack eyelids or the ability to protect their eyes. Heart and Blood. The circulatory system of the two groups is also different. All fish have four compartments in their hearts but the 4th compartment differs between sharks and bony fish. The compartment in sharks is called the conus arteriosus, a contractile cardiac muscle. read more

Fish with skeletons made of cartilage, such as sharks, often use another system to maintain buoyancy. Their skeleton is lighter than that of bony fish, and they carry oil in their livers; oil is usually lighter than water, providing a bit of buoyancy. read more

The swim bladder, gas bladder, fish maw or air bladder is an internal gas-filled organ that contributes to the ability of many bony fish (but not cartilaginous fish) to control their buoyancy, and thus to stay at their current water depth without having to waste energy in swimming. read more

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