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Porcupine Puffer
Diodon holocanthus
Animalia›Chordata›Actinopterygii›Diodontidae
📍 Worldwide tropical oceans
Endearing and personable puffer with large eyes and a round body covered in spines. Will eat inverts — FOWLR only. Develops a real personality and recognises its keeper.
Care Guide
Diet
Porcupine puffers are obligate carnivores requiring a diet of hard-shelled prey to maintain their continuously growing teeth. Feed live or frozen crustaceans such as shrimp, crabs, snails, and clams 2-3 times weekly. Supplement with quality carnivore pellets, but prioritize whole prey items for optimal nutrition and natural feeding behavior.
Behavior
Highly intelligent and curious fish that develop strong recognition of their keeper and distinct personalities over time. Generally semi-aggressive and territorial; they are solitary or may tolerate compatible tank mates depending on individual temperament. Active explorers that spend time in all water zones, investigating their environment and interacting with décor.
Breeding
Breeding porcupine puffers in captivity is extremely rare and poorly documented. No reliable breeding protocols exist for home aquariums, and sexual maturity, pair bonding requirements, and larval care remain largely unknown. Captive breeding is not a realistic goal for hobbyists.
Tank Mates
Similar saltwater requirements; fast enough to avoid predation; occupies different tank zones
May be eaten despite cleaning behavior; only attempt with well-fed, docile individuals
Risk of predation; best in larger tanks with plenty of hiding spots
Peaceful herbivore occupying different ecological niche; adequate speed to avoid aggression
Bottom-dwelling, non-aggressive; minimal competition for food or space
Common Diseases
Ich (Marine Ich)
White spots on body and fins, rapid breathing, lethargy, flashing against surfaces
Raise temperature to 28-29°C, increase aeration, use copper-based medication or hyposalinity treatment; quarantine affected fish
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges, progressive fin loss
Improve water quality, perform frequent water changes, use antibiotic medication if bacterial; ensure adequate filtration
Bloat/Constipation
Swollen abdomen, loss of appetite, difficulty swimming, lethargy
Feed varied diet with high-quality whole prey; offer occasional fasting days; ensure proper nutrition and water quality
Bacterial Infections
Open sores, ulcers, cloudy eyes, torn fins, behavioral changes
Maintain pristine water conditions, perform water changes, use broad-spectrum antibiotics if severe; quarantine if contagious
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Quick Facts
- pH
- 8.1–8.4
- diet
- carnivore/hard-shelled prey
- maxSize
- 12 inches
- salinity
- 1.023–1.025 SG
- minTankSize
- 100 gallons
- temperature
- 75–81°F (24–27°C)
Temperature
75–81°F
24–27°C