Fish, like many other living creatures, need oxygen in order to live.  Because of the underwater environment that they live in, fish have evolved a system of extracting oxygen from the surrounding water.

Water is drawn in through the mouth and passes over a set of gill membranes. As the water comes in contact with these gill membranes, oxygen that is dissolved in the water passes into tiny blood vessels.  The water is then expelled through the gill cover (operculum) at the sides of the head.

It is therefore important to ensure that the water inside your aquarium does not become oxygen deficient.  A sufficient filter will keep the oxygen levels maintained in the fish tank, as well as your regular water changes.  Make sure the pump on your filter is working and set correctly for the size of fish tank.

Do not overfill your tank with fish as oxygen levels will soon become depleted.

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