Poisonous fish are the fish that are poisonous to eat. They contain toxins which are not destroyed by the digestive system of animals who eat that fish.
Species of puffer fish are the most poisonous in the world. The internal organs of the fish contain an active substance called tetrodotoxin.
This substance is more powerful than cyanide.
One puffer fish has that much amount of poisonous substance that can kill 30 adult people.
This substance paralyse the diaphragm muscles of human body and the person dies of suffocation.
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