They obtain their name from the spots on their fins and the large number of spines on their body. As with many other puffers, they have a symbiotic relationship with types of bacteria such as Pseudoalteromonas tetraodonis. This bacteria produces tetradotoxin which is a powerful neurotoxin. These tetradoxin’s are found in their skin and internal organs. At night they are usually seen swimming just above the reef. During the day they are often seen resting on the substrate, usually quite well hidden. Spot-fin porcupinefish are nocturnal predators, using their impressive looking teeth to feed mainly on snails, hermit crabs, and sea urchins.