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Fishes do not exactly float, except when they die. Although fishes can move upwards and downwards by rising and sinking, sort of like a helium filled balloon. To do this, fishes need to reduce its overall density by reducing its volume without increasing its mass. For this, fishes have what we call a 'swim bladder'. This an organ that expands and contracts, just like a human lung. When the bladder is inflated, the fish has a maximum volume and is pushed to the surface. When its deflated, it has a minimum volume and sinks. In this way, fishes are capable of rising and sinking and also staying at a particular level.

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12y ago

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