When threatened by a predator, a puffer fish will suck in water and sometimes air to inflate itself like a balloon, making itself look bigger. Hence the predator will not be able to eat it as it is too big for the predator's mouth. Some species also have spines on their skin to ward off predators.
If a predator gobbles up a puffer before it inflates, it will not enjoy the food. Most pufferfish contain a toxic substance that makes them taste foul and potentially deadly to other fish. There is enough toxins in one pufferfish to kill 30 adult humans and there is no known antidote.
Other facts about the puffer fish
In Japan, puffer fish are known as fugu and they are an expensive delicacy. They are prepared only by licensed fugu chefs.
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