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Part of our fascination for fish comes from theiramazing diversity, brought

Part of our fascination for fish comes from their amazing diversity, brought about by the need to survive and adapt in a huge range of environments.

The ability to breathe air is one such adaptation, which has allowed a vast array of fish to survive and thrive in habitats that would simply not support other species. Many commonly-kept aquarium species have this ability, and so it is of interest to look at the biology of air-breathing.

Evolution of Air Breathing Air breathing has evolved in a large number of different fish species, thanks primarily to the limited abundance of oxygen in water.