Swim Bladder
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Example:
Imagine trying to find the perfect position on a crowded elevator where you neither feel squished nor too far from the buttons. Just like how you adjust your position to stay comfortable and in control within the elevator, bony fishes use their swim bladder to maintain the right depth in the water. The elevator is akin to the water column, the crowd represents water pressure, and the buttons are like the fish's swim bladder; by adjusting the gas in their swim bladder, fish can effortlessly rise or sink, just as you shift slightly to stay balanced in the elevator.
Practice Version
Swim Bladder: A gas-filled sac in bony fishes that helps them to control their swim depth. Swim bladder. The swim bladder is an internal organ that acts like a floatation device, allowing fish to maintain or change their position in the water without effort.