Gas Exchange in fish

Gas Exchange in fish

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Gas exchange in fish - gills

  • The gas exchange organs in fish are the gills.
  • Like other animals, fish require a gas exchange surface that:
    • is thin, but well protected from damage.
    • is moist, so gases can dissolve before they diffuse. This is not a problem for fish as they live in water. 
    • has a large surface area to meet their O2 requirements.


Gas Exchange in Fish - gills

Water contains a very low percentage of dissolved oxygen (1%) compared with air (20%), so fish require a gas exchange system with a very large surface area which is very efficient at extracting O2 from the water.

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