Do fishes breath?

by Red Brick  |  11 years, 5 month(s) ago

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have you ever thought if fishes could breath???

 Tags: breath, fishes



  1. Red Brick
    The water surrounding a fish contains a small percentage of dissolved oxygen. In the surface waters there can be about 5 ml. of oxygen per liter of water. Because this is much less than the 210 ml. of oxygen present in one liter of air, the fish must use a special system for concentrating the oxygen in the water to live. Although, some fishes have lungs just like in our body to breathe air, but most fishes breathe through gills. Gills are made up of thin sheets of tissue richly supplied with blood vessels. As water passes over them dissolved oxygen is absorbed into the blood and waste products such as carbon dioxide pass out into the water. Few fishes (e.g. eel) can breathe for some time through skin in damp grass.

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