A pufferfish can be caught underwater on Fossil Island. They are used to puff on to gain 15% more oxygen to stay underwater for longer. If the player has a fishbowl helmet equipped, it cannot be puffed, stating that "You ineffectually squash the poor puffer fish against your helmet".
Upon returning to the surface, all pufferfish in the player's possession will disappear.
Attempting to drop a pufferfish above water results in the message "The poor pufferfish expires with a lack of access to the sea.".
Item sources
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Trivia
The pufferfish is the only item to provide negative weight while in the inventory; all other weight reducing items only have negative weight while equipped.
Using a carrot on a pufferfish displays the message The pufferfish eats the carrot and makes a strange sound. This is a reference to a viral video of a pufferfish biting a carrot.
