Porcupine Puffer Fish

The Long-spine Porcupine Puffer, *Diodon holocanthus*, is a captivating and charismatic addition to a large marine aquarium. Known for its ability to inflate into a spiny ball when threatened, this puffer is a true showstopper. Its body is typically a mottled brown or tan with darker spots, and it is covered in long, sharp spines that are erect when the fish is inflated. Large, expressive eyes and a beak-like mouth add to its unique appearance.

A minimum tank size of 180 gallons is recommended for a single Long-spine Porcupine Puffer due to its potential size and active nature. The aquarium should have plenty of open swimming space, as well as some rockwork for hiding. A sandy substrate is preferred as they may occasionally burrow. This species is not considered reef-safe as it will readily consume invertebrates, including crustaceans, mollusks, and echinoderms. They may also nip at corals.

In the aquarium, the Long-spine Porcupine Puffer will grow to a considerable size, potentially reaching up to 12 inches. They are generally peaceful towards other fish that are too large to be considered prey, but they can be aggressive towards smaller fish and conspecifics.

The diet of the Long-spine Porcupine Puffer should be varied and include a mix of meaty foods. Offerings such as krill, shrimp, squid, and marine fish are readily accepted. It is important to provide hard-shelled foods, such as snails or hermit crabs, occasionally to help wear down their continuously growing teeth. Feed two to three times per day.

There are no readily apparent visual differences between male and female Long-spine Porcupine Puffers. Breeding in captivity is extremely rare.

Quick Facts

• Scientific Name: Diodon holocanthus
• Care Level: Advanced
• Temperament: Aggressive
• Diet: Carnivore
• Reef Compatibility: Not Reef Safe
• Region of Origin: Indo-Pacific
• Maximum Adult Size: 20"
• Recommended Tank Size: 180 gallons