Common name: French Butterflyfish

General Information

The French Butterflyfish, scientifically known as Prognathodes guyanensis, is a captivating species that adds a touch of elegance to any aquarium. Recognized for its striking white and black coloration with yellow accents, this species is a favorite among marine enthusiasts. Although not as commonly seen in the trade as some other butterflyfish, its unique appearance makes it a prized addition for those looking to diversify their marine collection.

This species is native to the Western Atlantic, particularly around the Caribbean Sea and the coast of Brazil. Its natural habitat includes rocky reefs and coral-rich environments, where it can often be found at depths ranging from 20 to 100 meters.

Care

The French Butterflyfish requires a well-established aquarium with plenty of live rock to provide hiding places and grazing opportunities. It is moderately challenging to care for, making it more suitable for aquarists with some experience. A tank of at least 300 liters is recommended to accommodate its active swimming habits and territorial nature.

Maintaining stable water conditions is crucial, with a focus on high water quality and adequate filtration. The tank should mimic its natural habitat with a variety of rock formations and moderate water flow.

Diet and Feeding

In the wild, Prognathodes guyanensis primarily feeds on small invertebrates and coral polyps. In captivity, it should be offered a varied diet that includes high-quality frozen foods such as mysis shrimp, brine shrimp, and finely chopped seafood. Supplementing with marine algae and spirulina can help meet its nutritional needs.

Feeding should occur two to three times daily, with portions adjusted based on the fish's size and activity level. Ensuring a balanced diet is key to maintaining its vibrant coloration and overall health.

Behavior and Compatibility

The French Butterflyfish is generally peaceful but can be territorial, especially towards other butterflyfish. It is best kept singly or in a well-planned community tank with other non-aggressive species.

This species is not considered reef-safe, as it may nip at coral polyps and small invertebrates. Careful consideration should be given to tank mates and the overall setup to prevent any potential issues.

Health and Common Issues

With proper care, the French Butterflyfish can thrive in captivity. It is important to monitor for common marine ailments such as ich and fin rot, which can be mitigated by maintaining optimal water quality and a stress-free environment.

Regular observation and prompt action at the first sign of illness are essential to ensure the health and longevity of this species. Quarantining new additions and providing a balanced diet can also help prevent health issues.

Habitat

Prognathodes guyanensis is typically found in the Western Atlantic, particularly in the Caribbean Sea and along the Brazilian coast. It inhabits rocky reefs and coral-rich areas, often at depths between 20 and 100 meters. These environments provide ample hiding spots and feeding opportunities, which are crucial for its survival.

Creating a similar environment in captivity, with plenty of live rock and crevices, can help replicate its natural habitat and promote natural behaviors.