how do fish breath in water ?
Why fish do not live without water?
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Most fish, if not all, get their oxygen supply in the water—which is where gills come into the picture. Fish's unique respiratory systems make use of gills to let water in and extract the oxygen from it using the tiny blood vessels found on the gills' surface before discharging waste gases back out.
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Fishes respire with the help of gills. Gills are richly supplied with blood capillaries and can readily absorb oxygen dissolved in water. Since fishes cannot absorb gaseous oxygen they die soon after they are taken out of water.
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