What are Algal Blooms? Give two harmful effect of Algal bloom in Aquatic body.

Explanation

Algal bloom is the excessive growth of planktons (algae) due to presence of large amounts of nutrients in water, like mitates, phosphates. It leads to entrophication.
Harmful effects.
1. It causes depletion of `O_2` in water and poses a threat to aquatic animals.
2. It releases toxins in water to inhibit the growth of other algae and aquatic animals like fishes.