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Deepseawaters
Home Deep
Sea FAQDo fish
breathe air?
Do Fish Breathe Air?
Yes,
but not directly into the lungs as mammals do
(except for some tropical fish). (Actually they breathe oxygen
not air.) As water passes over a system of extremely fine
gill membranes, fish absorb the water's oxygen content. Gills
contain a network of fine blood vessels (capillaries) that
take up the oxygen and diffuse it through the membranes.
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