Yellow longnose butterflyfish (Forcipiger flavissimus)

Classification (WoRMS)

Full classification as recorded by WoRMS: Kingdom: Animalia · Phylum: Chordata · Class: Teleostei · Order: Acanthuriformes · Family: Chaetodontidae · Genus: Forcipiger.

Accepted name: Forcipiger flavissimus · Authority: Jordan & McGregor, 1898 · Taxonomic status: accepted · AphiaID: 218760.

Synonyms and superseded combinations recorded for this taxon: Foreipiger flavissimus Jordan & McGregor, 1898.

Source: World Register of Marine Species (WoRMS) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=218760 (CC BY 4.0). Accessed 2026-09-25.

Biology and life history (FishBase)

Measured values published by FishBase for Forcipiger flavissimus. Only fields the database actually holds for this species are shown; these are database values, not aquarium guidance.

Maximum length: 22 cm · Depth range: 0–145 m · Habitat zone: reef-associated · Body shape: short and / or deep · Vulnerability index: 12 of 100 · Fishery importance: of no interest · Aquarium trade: commercial.

FishBase notes: Common in exposed seaward reefs but also found in lagoon reefs (Ref. 9286). Benthopelagic (Ref. 58302). Solitary or in small groups of up to 5 individuals (Ref. 9286).

Adults usually in pairs (Ref. 48636). Feed on a wide variety of animal prey including hydroids, fish eggs, small crustaceans but prefers tube feet of echinoderms, pedicilaria of sea urchins, and polychaete tentacles (Ref. 1602). Oviparous (Ref. 205), monogamous (Ref. 52884).

Form pairs during breeding (Ref. 205). Second most important export in Hawaii (Ref. 37816). Minimum depth reported taken from Ref. 128797.

Source: FishBase species summary (SpecCode 5584) — https://www.fishbase.se/summary/Forcipiger-flavissimus.html (CC BY-NC 3.0 — non-commercial use only). Accessed 2026-09-25.

Distribution and occurrence records (GBIF)

9,285 georeferenced occurrence records for Forcipiger flavissimus are published through GBIF from 61 countries or marine areas. The map above plots 386 distinct locations from a sample of 3,000 records, omitting 37 inland records that carry an institution's coordinates rather than a collection site; it shows where the species has been observed and reported, not a modelled range.

Most records by country or area: United States of America (2,166); Australia (1,885); Northern Mariana Islands (785); French Polynesia (645); United States Minor Outlying Islands (624).

The full country table, WoRMS marine regions and the sampling notes are on this species' Distribution page.

Source: GBIF Occurrence Search (taxonKey 2385706) — https://www.gbif.org/occurrence/search?taxon_key=2385706&has_coordinate=true (records CC0 / CC BY); WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=218760 (CC BY 4.0); Natural Earth 110m basemap — https://www.naturalearthdata.com/ (public domain). Accessed 2026-09-25.

Conservation status (IUCN Red List)

The IUCN Red List assesses Forcipiger flavissimus Jordan & McGregor, 1898 as Least Concern (code LC). No trend, population estimate or threat analysis is given here, because none is available from this source without the Red List API; follow the source link for the full assessment, including its date.

Source: IUCN Red List of Threatened Species (taxon 165716) — https://www.iucnredlist.org/species/165716/0; GBIF IUCN Red List category endpoint (taxonKey 2385706) — https://api.gbif.org/v1/species/2385706/iucnRedListCategory. Accessed 2026-09-25.

Description and natural history (Wikipedia)

This species can be found in the aquarium trade, and grows up to 22 cm in length.

Range and Distribution

The yellow longnose butterflyfish is widespread throughout the tropical waters of the Indo-Pacific area from the eastern coast of Africa to Hawaii, Red Sea included, and is also found in the eastern Pacific Ocean from Baja California to the Revillagigedo Islands and the Galapagos.

Territoriality

Being territorial, yellow longnose butterflyfish patrol their patches of coral with a monogamous partner. However, instances of overt aggression among F. flavissimus have been observed between territory holders and individuals of the same sex. Chasing is rare, but when it does occur, males chase males and females chase females. Females defend food resources from other females, while males defend territories containing a female from other males.

Territoriality is a favorable strategy for a species to adopt primarily when resources are temporally stable, predictable, and evenly distributed throughout a territory. Territoriality is commonly displayed by benthic-feeding longnose butterflyfish, therefore, because their main dietary resources fulfill these characteristics. Their monogamous pairing appears to be closely linked to their territorial behavior. Although several could cause a species to evolve monogamous behavior, the necessity for biparental care does not apply to longnose butterflyfish because they lay pelagic, or freely floating, eggs.

One source of selective pressure responsible for the monogamous pairs observed could be the advantage of territorial defense it provides. Monogamy is favored when a pair makes the defense of one or more resources more efficient than defense by a solitary individual. Longnose butterflyfish pairs have been confirmed by studies to be heterosexual and pair fidelity has been observed for periods of up to seven or more years.

Besides the advertisement displays accomplished through monogamous pairing, territorial domination by longnose butterflyfish has also been observed by means of acoustic behaviors, which provide important cues and social signals during fish communication. Emitting sounds through complicated body movements is another technique they use to advertise territorial boundaries. Potential rivals are able to assess body size of a competitor based on the duration and intensity of the sound a yellow longnose butterflyfish produces.

The duration and intensity of the sounds emitted during antagonistic behaviors, such as the defense of one's territory, often predict the ability of an individual to secure that territory. A sound of long duration and high intensity, therefore, often indicates an individual has a large territory. Defending territory is the strategy these species adopt to compete for and maximize their claims over resources.

Source: Wikipedia: Yellow longnose butterflyfish — https://en.wikipedia.org/wiki/Yellow_longnose_butterflyfish (CC BY-SA 4.0). Accessed 2026-09-25.