Oxymonacanthus longirostris  (Bloch & Schneider, 1801)

Harlequin filefish
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Oxymonacanthus longirostris
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Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Tetraodontiformes (Puffers and filefishes) > Monacanthidae (Filefishes)
Etymology: Oxymonacanthus: Greek, oxys = sharp + Greek, monos = one + Greek, akantha = thorn (Ref. 45335).

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; reef-associated; non-migratory; depth range 1 - 35 m (Ref. 90102).   Tropical; 30°N - 24°S, 114°E - 171°E

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Indo-Pacific: East Africa south to Maputo, Mozambique (Ref. 4421) and east to Samoa, north to Ryukyu Islands, south to the southern Great Barrier Reef, New Caledonia, and Tonga. Replaced by Oxymonacanthus halli in the Red Sea.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 12.0 cm TL male/unsexed; (Ref. 9710)

Short description Morphology | Morphometrics

Dorsal spines (total): 2; Dorsal soft rays (total): 31-35; Anal spines: 0; Anal soft rays: 29 - 32. Ventral rudiment absent; bristles on caudal peduncle of males longer than others on body (Ref. 37816).

Biology     Glossary (e.g. epibenthic)

Occurs in clear lagoon and seaward reefs from 0.5 to at least 30 m. Found in pairs or small groups and nests near bases of dead corals, often on clumps of algae. Monogamous (Ref. 52884, 48637). Feeds exclusively on Acropora polyps. Feeding takes place throughout the day becoming less towards the evening (Ref. 46144).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Aggression is used commonly in courtship. Spawning commences when after swimming together in different tufts, the female concentrates on just one and begins to thrust repeatedly and pause. The male follows suit nuzzling the female. The female then drops into the algae and spawns, while the male releases the sperm beside her. The pair then swims back to their territory (Ref. 46144). Monogamous mating is observed as both facultative and social (Ref. 52884).

Main reference Upload your references | References | Coordinator : Hutchins, Barry | Collaborators

Myers, R.F., 1991. Micronesian reef fishes. Second Ed. Coral Graphics, Barrigada, Guam. 298 p. (Ref. 1602)

IUCN Red List Status (Ref. 115185)

  Vulnerable (VU) (A3c)

CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless




Human uses

Fisheries: of no interest; aquarium: commercial
FAO(Publication : search) | FishSource | Sea Around Us

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Estimates of some properties based on models

Preferred temperature (Ref. 115969): 25 - 29.3, mean 28.4 (based on 2439 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.7500   [Uniqueness, from 0.5 = low to 2.0 = high].
Trophic Level (Ref. 69278):  3.3   ±0.6 se; Based on diet studies.
Resilience (Ref. 69278):  Medium, minimum population doubling time 1.4 - 4.4 years (Fec = 200).
Vulnerability (Ref. 59153):  Low vulnerability (20 of 100) .