Oxygen is very crucial to the survival of fish in ponds. Fish needs energy to breath. When the concentration of oxygen in the water is reduced as a result of one factor or the other, it leads to the death of the fishes that are living in that pond. The value of oxygen needed in water for fishes to survive ranges from 3 to 10 part per million. The amount of oxygen needed in a pond usually increase as the temperature of the water increases.
Explanation: Oxygen plays a very vital role in the life of aquatic animals. The dissolved oxygen in the water helps them to breathe under water.
Optimum level of oxygen for deep living animals like oysters, bottom feeders, crabs is around (1-6 mg/L), while the animals living on the upper side like fishes require a higher amount of around (4-6 mg/L).
If the oxygen concentration in the pond is not optimum, there will no aquatic life and hence, the ecosystem will be affected.
Hence, oxygen concentration affects the fishes that live in the pond to a higher extent.
