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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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