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The gas exchange organs of fish are called gills. Fish possess several gills located between their mouth cavity (buccal cavity) and a chamber at the sides of their mouth called the operculum.
Oxygen passes from the water into the blood at the gills. Removal of carbon dioxide also occurs, as the blood containing high concentrations of the waste gas goes to the gills, and the carbon dioxide diffuses out into the water down a diffusion gradient (external water has lower concentrations of carbon dioxide than levels in the blood, so this sets up a diffusion gradient.)
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