Saltwater Fish
Big Longnose Butterflyfish

Species Description…

Scientific Name: Forcipiger longirostris
Common Name: Big Longnose Butterflyfish
Species Group: Butterflyfish
Habitat: Reef Safe with Caution
Care Level: Intermediate
Temperament: Peaceful
Diet Type: Carnivore
Role in Aquarium: Showpiece Fish
Max Fish Length: 8 (inches)
Min Aquarium Size: 75 (gallons)
Native Range: Indo-Pacific
Forcipiger longirostris - Big Longnose Butterflyfish

Forcipiger longirostris (Big Longnose Butterflyfish)

Overview

  • Found in the Indo-Pacific, ranging from the Red Sea to Hawaii and French Polynesia.
  • Distinguished by its bright yellow body, elongated snout, and a dark mask over the eyes.
  • Closely related to the Yellow Longnose Butterflyfish but has a more slender snout.
  • Uses its narrow mouth to extract small invertebrates from coral crevices.
  • A peaceful, reef-associated fish that often forms monogamous pairs in the wild.

Feeding

  • Primarily feeds on small crustaceans, worms, and other benthic invertebrates.
  • Prefers a diet rich in live or frozen foods such as mysis shrimp, brine shrimp, and chopped seafood.
  • May graze on sponge matter and microalgae in a well-established reef tank.
  • Requires frequent, varied feedings to maintain health and energy.
  • Best kept in aquariums with an abundant source of natural microfauna.

Habitat

  • Commonly found in coral reefs, lagoons, and outer reef slopes.
  • Thrives in environments with moderate currents and plenty of rock structures.
  • Prefers tanks with open swimming areas and multiple hiding spots.
  • Reef-safe when housed with non-aggressive tank mates.
  • Ideal tank size is at least 75 gallons for a single specimen.

Fish Care

  • Optimal water temperature: 75-82°F (24-28°C).
  • pH range: 8.1-8.4, with a specific gravity of 1.023-1.026.
  • Requires stable water parameters and high-quality filtration.
  • More delicate than Forcipiger flavissimus, needing expert-level care.
  • Adapts slowly to captivity but thrives in well-maintained reef tanks.

Compatibility

  • Peaceful and best suited for non-aggressive community reef tanks.
  • Compatible with other butterflyfish, tangs, wrasses, and gobies.
  • Should not be housed with highly aggressive or predatory fish.
  • May display territorial tendencies towards other longnose butterflyfish.
  • Pairs well with fish that do not compete for similar food sources.

Aquarium Behavior

  • Active swimmer that explores its surroundings in search of food.
  • Often seen probing rock crevices with its elongated snout.
  • Initially shy but becomes more confident once acclimated.
  • Forms strong bonds with tank mates, particularly if kept in pairs.
  • Displays curiosity towards its environment, making it an engaging addition to reef tanks.