how does a fish manage to rise up an move down in water
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A swim bladder is just an expandable sac, like a human lung. To reduce its overall density, a fish fills the bladder with oxygen collected from the surrounding water via the gills. ... In this case, the forces of buoyancy and gravity cancel each other out, and the fish stays at that level.
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Fishes have air sacs or air bladders present inside their body which provides them with buoyancy.
When air is filled in these bladders the fish becomes lighter and it can float
Therefore by filling and emptying air in these bladders the fish can rise up and move down
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