Best answer
This is called the gill slit. Many fish have four pairs of gills, while sharks may have up to seven. Even though fish can live their lives underwater, they still need oxygen to 渂reathe? Instead of breathing air, fish must get their oxygen from the water.
People also ask
How much oxygen does a fish need?
Bottom feeders, crabs, oysters, and worms need minimal amounts of oxygen (1-6 mg/L), while shallow water fish need higher levels of 4-15 mg/L. Microbes such as bacteria and fungi also require dissolved oxygen. DO is necessary to many forms of life including fish, invertebrates, bacteria, and plants.
What is the solubility of oxygen in fish tank water?
The solubility of oxygen in water is very much dependent upon the fish tank temperature. Warm water contains a lot less dissolved oxygen than cold water. The table below shows the mg. oxygen that will be present in water that is fully saturated with air at various water temperatures.
Can fish get out of breath?
Yes, fish can absolutely get out of breath if oxygen levels are insufficient. If this is the case, you will likely see them gasping for air on the surface of the water, or observe their gills moving quickly in an effort to gain more oxygen.
How do I know if my fish tank has enough oxygen?
The best way to tell if your tank has enough oxygen is by paying attention to the habits of your fish. If they are not gasping for air or acting differently, then you檙e probably in the clear.