Porcupine Puffer (Linnaeus, 1758)
| Scientific Name | Diodon holocanthus |
| Diet | Omnivore; lots of meaty food and algae based items. |
| Alt Common Name | Longspine, Brown, Balloon, Blotched, Freckled Porcupine Puffer, Spiny Puffer, Harisenbon (Jap. 'thousand needles') |
| Family | Diodontidae |
| Origin | Atlantic Ocean |
| Aquarist Level | Intermediate |
| Reef Safe | No |
| Coloration | Brown or tan with dark accents |
| Disposition | Peaceful, will nip fins |
| Hardiness | Moderate |
| Compatibility | Peaceful with others of this species. Peaceful with other families. Should not be housed with fish small enough to fit in its mouth. |
| Mature Size | 20 inches |
| Sexual Dimorphism | Not visible |
| Venomous | Flesh is poisonous if eaten |
Notes: Puffers are some of the most personable marine fish available today. Many aquarists remark that they behave like dog. They like attention and will eat from their owners hand. Just be careful not to let them get your fingers. Puffers do not have teeth, instead their jaw bones are fused together and are exposed. These psuedo-teeth are very strong and quite sharp.
When puffers "puff up" it is a defense mechanism. They want to look bigger so other fish will think twice about trying to eat or harass them. Puffers should not be encouraged to display this response intentionally, because to "puff up" is a very stressful event. If constantly repeated this can lead to health problems for the fish. A puffer gulping for air at the surface is reason for concern. Breathing above water can damage the internal controls for "puffing up" and can lead to health problems. Floating food should be avoided because of this concern.