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How is the life of organisms living in water affected when water gets polluted?
The life of organisms living in water is adversely affected due to the addition of pollutants in water in the following ways:
- Untreated industrial wastes add various to the water bodies that kill various useful microorganisms present in water bodies.
- The addition of fertilisers and sewage adds nutrients to the water. This addition of nutrients causes excessive algae growth, the phenomenon called . The death and subsequent decomposition of organic matter increase the biological demand, ultimately reducing the dissolved , leading to the death of aquatic organisms, including fishes.
- Regular discharge of industrial wastes carrying heavy metals in water bodies leads to biomagnification of heavy metals like , cadmium, etc. That threatens aquatic organisms' life.
- Hot water released from thermal power plants reduces the content and kills various aquatic organisms (fishes, etc.) present in water.
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