Common name: Northern Scythe Butterflyfish

General Information

The Northern Scythe Butterflyfish, scientifically known as Prognathodes falcifer, is a captivating species that has intrigued both hobbyists and marine biologists alike. Known for its striking appearance and unique shape, this butterflyfish is a rare gem in the aquarium trade. Its elongated snout and distinct color pattern make it a standout species, often sought after by advanced aquarists.

Very similar to Prognathodes carlhubbsi, they can be easily distinguished by their snout band. In P. falcifer, the dark band on the snout is pale gray to yellow, whereas in P. carlhubbsi, it is black. While both are found in the Eastern Pacific, they differ in geographic distribution which is sometimes reflected in their common name.

While not as commonly seen in home aquariums as other butterflyfish, the Scythe Butterflyfish holds a special place due to its rarity and the challenge it presents in care. This species is native to the Eastern Pacific, particularly around the Galapagos Islands and the coast of Ecuador, where it inhabits rocky reefs and steep drop-offs.

Care

Caring for the Scythe Butterflyfish requires a well-established aquarium with plenty of live rock and hiding places. This species thrives in a stable environment with pristine water quality. Due to its specialized diet and sensitivity to water conditions, it is recommended for experienced aquarists.

A tank size of at least 300 liters (about 80 gallons) is recommended to provide ample swimming space and to accommodate its territorial nature. The aquarium should mimic its natural habitat with rocky structures and moderate water flow.

Diet and Feeding

The Scythe Butterflyfish is primarily a carnivore, feeding on small invertebrates and coral polyps in the wild. In captivity, it requires a varied diet that includes high-quality frozen foods such as mysis shrimp, brine shrimp, and finely chopped seafood. Offering a mix of foods helps ensure nutritional balance and encourages feeding.

Feeding should occur multiple times a day, with portions small enough to be consumed quickly to prevent water quality issues. Due to its specialized diet, it may take time for the Scythe Butterflyfish to adapt to prepared foods.

Behavior and Compatibility

This butterflyfish is known for its semi-aggressive temperament, particularly towards other butterflyfish or similarly shaped species. It is best kept as a solitary specimen or in a large tank with plenty of space to establish territories.

While not considered reef-safe, the Scythe Butterflyfish can coexist with other non-aggressive fish species. Caution is advised when housing it with invertebrates or corals, as it may nip at polyps and small crustaceans.

Health and Common Issues

The Scythe Butterflyfish is susceptible to common marine diseases such as ich and marine velvet. Maintaining excellent water quality and a stress-free environment is crucial for its health. Regular monitoring and quarantine of new tank additions can help prevent disease outbreaks.

When selecting a Scythe Butterflyfish, look for individuals that are active, alert, and free from visible signs of disease. Proper acclimation and a stable environment are key to ensuring their longevity in captivity.