Actinopterygii (ray-finned fishes) > Perciformes
(Perch-likes) > Acanthuridae
(Surgeonfishes, tangs, unicornfishes) > Nasinae
Etymology: Naso: Latin, nasus = nose (Ref. 45335).
Environment / Climate / Range
Marine; reef-associated; depth range 2 - 122 m (Ref. 58302), usually 4 - 46 m (Ref. 27115). Tropical; 24°C - 28°C (Ref. 27115); 29°N - 36°S, 26°E - 137°W (Ref. 57250)
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 60.0 cm FL male/unsexed; (Ref. 1602)
soft rays: 27 - 30. Adults bluish grey to olivaceous brown in color, commonly pale anteriorly and on cheek and throat; short irregular lines on sides of body; diagonal lines on horn; lip edges blue (Ref. 3145). Subadults with dark spots on head and body (Ref. 3145). Juveniles lack the prominent horn of adults (Ref. 1602).
Indo-Pacific: Red Sea and East Africa to the Hawaiian, Marquesan and Ducie islands, north to southern Japan, south to Lord Howe Island.
Inhabit mid-waters along steep outer lagoon and seaward reef drop-offs. Also found along rocky shores (Ref. 30573, 48637). Benthopelagic (Ref. 58302). Usually in small groups but form large schools in oceanic locations or on reefs subject to strong currents (Ref. 48637). Juveniles and subadults feed on benthic algae; adults feed on zooplankton. Pair spawning has been observed. Caught with nets (Ref. 30573).
Myers, R.F., 1991. Micronesian reef fishes. Second Ed. Coral Graphics, Barrigada, Guam. 298 p.
IUCN Red List Status (Ref. 90363)
CITES (Ref. 94142)
Threat to humans
Reports of ciguatera poisoning (Ref. 30298)
Fisheries: commercial; aquarium: commercial
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02400 (0.01541 - 0.03738), b=2.99 (2.86 - 3.12), based on LWR estimates for species & Genus-BS (Ref. 93245
Trophic Level (Ref. 69278
): 2.2 ±0.15 se; Based on food items.
Resilience (Ref. 69278
): Medium, minimum population doubling time 1.4 - 4.4 years (K=0.402; Tmax=25).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (33 of 100) .