People also ask
How does oxygen pass through the gills of fish?
The fish allows fresh water, which contains dissolved oxygen, to pass into its mouth and over its gills. These are rich in blood vessels and also have a large surface area. The oxygen from the water passes into the blood of the fish by diffusion, and waste carbon dioxide passes out the same way.
How do fish breathe in water?
Fish breathe through their gills.Oxygen is dissolved in water and the fish use that oxygen. Fishes have Gills on two sides of their heads. They take water through their mouth and take it out of their gills.
Do fish need oxygen to live?
Despite living in water, fishes need oxygen to live. Unlike land-dwellers, though, they must extract this vital oxygen from water, which is over 800 times as dense as air.
What is dissolved oxygen in fish tanks?
In the vast majority of cases, fish meet their respiratory needs using dissolved oxygen in tanks. This is a process where oxygen molecules from the atmosphere dissolve naturally in the water. The air we breathe is composed of approximately 20% oxygen and 80% nitrogen. However, only a small fraction dissolves in water.