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.
