Actinopterygii (ray-finned fishes) > Perciformes
(Perch-likes) > Acanthuridae
(Surgeonfishes, tangs, unicornfishes) > Nasinae
Etymology: Naso: Latin, nasus = nose (Ref. 45335).
Environment / Climate / Range
Marine; brackish; reef-associated; depth range 6 - 150 m (Ref. 30573), usually 10 - 137 m (Ref. 27115). Tropical; 25°C - 28°C (Ref. 27115); 24°N - 32°S, 30°E - 145°W (Ref. 57251)
Length at first maturity / Size / Weight / Age
Maturity: Lm 45.0  range ? - ? cm
Max length : 75.0 cm FL male/unsexed; (Ref. 1602); common length : 50.0 cm TL male/unsexed; (Ref. 30573)
soft rays: 27 - 30. Almost fusiform, body grayish to greenish brown, paler below. Two weak immovable bucklers on each side of caudal peduncle. Without horn; short groove in front of eye. Yellowish brown preopercular margin. Over 25 cm with black tongue. Skin granulated or velvety. Teeth small and slender, close-set and pointed. Caudal fin emarginate in young.
Indo-Pacific: Red Sea and East Africa (Ref. 9710), including the Mascarene Islands (Ref. 37792) to the Hawaiian, Marquesan and Ducie islands, north to southern Japan, south to Lord Howe Island.
Inhabits clear lagoon and seaward reef slopes (Ref. 9710, 48637). Benthopelagic (Ref. 58302). Usually seen in large schools (Ref. 90102). Mainly diurnal, it feeds on zooplankton such as crab larvae, arrow worms, pelagic tunicates, and occasionally filamentous red algae. The species is never poisonous (Ref. 4795).
Myers, R.F., 1991. Micronesian reef fishes. Second Ed. Coral Graphics, Barrigada, Guam. 298 p.
IUCN Red List Status (Ref. 90363)
Fisheries: commercial; gamefish: yes; 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=0.02450 (0.01478 - 0.04061), b=2.95 (2.80 - 3.10), based on LWR estimates for species & Genus-BS (Ref. 93245
Trophic Level (Ref. 69278
): 3.3 ±0.4 se; Based on diet studies.
Resilience (Ref. 69278
): Low, minimum population doubling time 4.5 - 14 years (tm=7; K=0.221; Tmax=44;).
Vulnerability (Ref. 59153
): Moderate vulnerability (41 of 100) .