Sources of oxygen and how the fish in water gets oxygen

This process requires large volumes of water to pass through absorption surfaces to get enough oxygen into their bodies using their mouths and gills. These body parts work like a pump to keep water moving over the gas absorption surfaces of the gills.

The sources of oxygen is oxygen supply . The fishing water gets oxygen , fish have gills to breathe in the oxygen contained in water.

where is the diagram?

if you insert the diagram ill be able to you