Saltwater Fish
Longnose Filefish

Species Description…

Scientific Name: Oxymonacanthus longirostris
Common Name: Longnose Filefish
Species Group: Filefish
Habitat: Reef Safe with Caution
Care Level: Advanced
Temperament: Peaceful
Diet Type: Carnivore
Role in Aquarium: Showpiece Fish
Max Fish Length: 4 (inches)
Min Aquarium Size: 75 (gallons)
Native Range: Indo-Pacific
Oxymonacanthus longirostris - Longnose Filefish

Oxymonacanthus longirostris (Longnose Filefish)

Overview

  • Native to the Indo-Pacific, particularly around coral reefs and rocky outcrops.
  • Recognized for its elongated snout, vibrant yellow-green coloration, and unique body shape.
  • Known for its ability to blend into its environment, using its body structure and coloration for camouflage.
  • Prefers to hover motionless among coral and algae, waiting for small invertebrates to approach.

Feeding

  • Omnivorous, feeding on small invertebrates, algae, and detritus.
  • Readily accepts frozen brine shrimp, mysis shrimp, and finely chopped seafood.
  • Occasionally grazes on algae and plant matter in the wild, aiding in cleaning its environment.
  • Multiple small feedings throughout the day replicate its natural foraging behavior.

Habitat

  • Prefers rocky reef environments with plenty of hiding spots and coral cover.
  • Thrives in environments with moderate to strong currents that facilitate natural feeding.
  • Often found in the shallows of coral reefs, where it can easily blend into its surroundings.
  • Needs a clean, well-maintained environment with plenty of stable rockwork for perching and shelter.

Fish Care

  • Optimal water temperature: 75-82°F (24-28°C).
  • pH level: 8.1-8.4, with a specific gravity of 1.023-1.026.
  • Stable water conditions and regular maintenance are essential for a healthy environment.
  • Consistent water quality is crucial to maintaining its well-being and vibrant coloration.

Compatibility

  • Generally peaceful but may become territorial if food is scarce.
  • Best kept with other non-aggressive species that do not disturb its feeding or resting areas.
  • Should not be housed with overly active fish that may compete for space or cause stress.
  • Prefers a calm, structured environment with compatible tank mates.

Aquarium Behavior

  • Frequently seen hovering motionless in front of coral formations, waiting for prey.
  • Adapts well to captivity when provided with a secure, peaceful environment.
  • Displays curiosity toward its surroundings, especially when interacting with other fish or tank features.
  • May occasionally show more active movements, particularly during feeding times.