Saltwater Fish
Devil Scorpionfish

Species Description…

Scientific Name: Inimicus didactylus
Common Name: Devil Scorpionfish
Species Group: Scorpionfish
Habitat: Fish Only
Care Level: Advanced
Temperament: Highly Predatory
Diet Type: Carnivore
Role in Aquarium: Predator
Max Fish Length: 12 (inches)
Min Aquarium Size: 75 (gallons)
Native Range: Indo-Pacific, including the Red Sea, the Gulf of Oman, and the eastern Indian Ocean
Inimicus didactylus - Devil Scorpionfish

Inimicus didactylus (Devil Scorpionfish)

Overview

  • Native to the Indo-Pacific, often found in sandy or muddy seabeds near coral reefs and estuaries.
  • Highly camouflaged with a rough, textured body that blends seamlessly into its surroundings.
  • One of the most venomous scorpionfish species, possessing potent venom in its dorsal spines.
  • Slow-moving but highly effective at ambushing unsuspecting prey.

Feeding

  • Carnivorous, primarily feeding on small fish, shrimp, and crustaceans.
  • Prefers live prey but can be trained to accept frozen or prepared seafood over time.
  • Requires infrequent but substantial meals, typically every two to three days.
  • Patience is needed when introducing non-live foods, as it relies on movement to trigger feeding.

Habitat

  • Often buries itself in soft substrates, leaving only its eyes and mouth exposed.
  • Best kept in a species-only or predator-friendly tank due to its slow-moving nature.
  • Requires a sandy or fine-gravel substrate to accommodate its natural burrowing behavior.
  • Minimal water flow is preferred, as strong currents can dislodge it from its resting spots.

Fish Care

  • Optimal water temperature: 75-82°F (24-28°C).
  • pH level: 8.1-8.4, with a specific gravity of 1.023-1.025.
  • Requires excellent water quality to prevent infections, especially around its delicate fin structures.
  • Care should be taken when handling or maintaining the aquarium, as its venomous spines can cause severe pain.

Compatibility

  • Best kept in a solitary or predator-focused aquarium.
  • Not suitable for tanks with small fish or invertebrates, as they will be viewed as prey.
  • Can coexist with other large, slow-moving predatory fish that do not compete for food.
  • Should not be housed with highly active or aggressive species that may stress it out.

Aquarium Behavior

  • Spends most of its time lying motionless, waiting for unsuspecting prey to swim by.
  • Capable of sudden bursts of movement when hunting or disturbed.
  • Relies on its camouflage to avoid detection, often blending perfectly with the substrate.
  • Exercise extreme caution when maintaining the tank to avoid accidental stings.