Pufferfish puffing Of course we are all familiar with the puffer fish's unique ability to puff. Pufferfish puff up when they get scared. It is very interesting to watch but the behavior should never be encouraged because it puts a tremendous amount of stress on the fish's body... pufferfish can puff up to 2 or 3 times their normal size! Fish keepers who keep puffer fish are encouraged not to take them out of water when transferring them because puffing up with air instead of water can be especially dangerous for them. Today this pufferfish did it in a natural way however we cannot grab this beautiful fish because puffing should be natural not a stressed out response to humans. http://en.wikipedia.org/wiki/Tetraodontidae
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