Dog-faced pufferfish

Geographical Origin and Habitat: Found throughout the tropical Indo-Pacific, from the Red Sea and East Africa to Micronesia and Samoa, and north to southern Japan. It inhabits coral-rich lagoons and sheltered seaward reefs.\n

Taxonomy and Morphology: Belongs to the family Tetraodontidae, genus Arothron. It has a rounded, flexible body covered in small dermal spines that are visible only when the fish inflates. The snout resembles that of a canine, hence the common name.\n

Social Behavior: Generally peaceful, slow-moving, and inquisitive. It may display territorial behavior towards other puffers of the genus Arothron. Known for its curious nature and interactive behavior with keepers.\n

Coloration and Sexual Dimorphism: Highly variable color morphs; the typical form is slate grey or brown with random black spots, but bright yellow ("golden") and bicolor specimens exist. No distinct external sexual dimorphism.

Aquarium Setup: Requires an aquarium of at least 100-120 gallons (400-500 liters). Provide a secure rockwork structure with large caves for shelter and open swimming areas. Ensure heaters and filter intakes are protected from biting.\n

Diet and Feeding: Carnivore. Requires hard-shelled foods to prevent dental overgrowth: open clams, mussels, whole shrimp, small crabs, and krill. Accepts frozen meaty foods readily.\n

Water Quality: Sensitive to high nitrate levels. Requires strong filtration with an oversized protein skimmer and regular water changes. Target: pH 8.1-8.4, specific gravity 1.020-1.025, temperature 24-26°C (75-79°F).\n

Compatibility and Cohabitation: Best suited for fish-only systems with semi-aggressive or large tankmates (tangs, large angels, mild triggerfish). Not reef-safe; will nip at corals and consume decorative invertebrates.\n

Aquarium Breeding: Has not been successfully bred in home aquaria.\n

Risks and Diseases: Susceptible to skin parasites such as marine ich (Cryptocaryon) and marine velvet. Because it lacks scales, copper medications must be used with extreme care; hyposalinity is often preferred.