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Question

Why do fishes die when taken out of water ?

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Solution

As the fish is taken out of the water the supply of oxygen to fish is cut as the fish cannot breathe the oxygen present in the atmosphere.
The fish breathe through gills, the water contains some dissolved oxygen in it. The WATER ENTERS THE FISH THROUGH ITS MOUTH and the dissolved oxygen will be taken in and carbon dioxide is given out through gills and thus the fish can breathe in water
As the gills cannot absorb the oxygen present in the atmosphere the fish will die when it is taken out of water


EXPLAINED ANSWER

There are fish who can breathe with lungs and other through their skin or with specially adapted mouth organs besides the gills. The gills do not function properly in dry air. They will dry up since they are specialised to distract oxygen from water streaming over them. The other thing about fishes is their scaled skin. This is covered with different sorts of mucus for microbe protection and this will dry up in the air. So if a fish should survive on land it would require a lungfish with heavy moisture in the air or moist mud available to hydrate the skin regularly.

Some fish are capable of this. There are lungfish surviving dry season by laying in the mud and gulp air.

All in all, they have developed in a fluid environment and are specialists in surviving these conditions. If we where to swim in water with the right temperature, so we don't freeze to death after a couple of hours, the skin would gradually be dissolved and hurt by the constant water penetrated the pores of the skin, we all know the way the skin curls up after an hour or so in the bathtub.


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