Although pufferfish may look cute and cuddly, their public enemy number one is other pufferfish. As adults, they can become territorial in an aquarium and in turn attempt to injure others. At the aquarium, staff works hard to keep them all living together and happy. (Only one pufferfish should call a tank home because an aggressive fight may erupt if a second one moves into the neighborhood.) Another interesting fact about this magnificent species is that they are extremely poisonous (only some species are poisonous, see below from Wikipedia)
Some species are poisonous, having a tetrodotoxin in their internal organs, such as the ovaries and liver. This neurotoxin is at least 1200 times more potent than cyanide, but some scientists believe it is produced by several types of bacteria that are somehow obtained from the fish's diet as fish bred in captivity are not poisonous.
The most unique quality of a puffer is its ability to swell up when scared or threatened. This adaptation is a magnificent sight to see. So, enjoy viewing puffers from afar, at the NC Aquarium.