Question

Most fish don't want to sunk in water because presence of

Answer 1

To reduce its overall density. a fish fills the bladder with oxygen collected from the surrounding water via the gills...Most fish and sink using this method,but not all do.
Some species don't need a swim bladder because they spend all their life skimming along the ocean.

Answer 2

Fish are slightly more dense than the water in which they swim. They are almost neutrally buoyant, meaning the forces acting against the fish to make it sink are about equal to the forces inside the fish causing it to float. It also means fish don't have to work too hard to keep from floating or sinking.


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