- Waste substances such as poisonous metals that include mercury, lead, zinc, arsenic and cadmium are discharged into the water body.
- Poisonous metals are absorbed by the water plants in the water body.
- The water plants containing the poisonous metals are eaten by fish.
- Fish caught from the sea contain high concentrations of poisonous metals.
- Villagers who eat the fish are poisoned.
- Mercury poisoning leads to syndrome such as trembling, loss of coordination, slurred speech, memory loss.
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