Environment: milieu / climate zone / depth range / distribution range
Sinh thái học
Biển Cùng sống ở rạn san hô; Mức độ sâu 0 - 90 m (Ref. 9710), usually 5 - 30 m (Ref. 37792). Tropical; 35°N - 30°S, 105°E - 130°W
East Indian Ocean from Christmas Pacific Ocean: Honshu, Japan south to the Great Barrier Reef and New Caledonia and east to the Hawaiian Islands, French Polynesia, and Pitcairn. Eastern Pacific: Clipperton Island. Once regarded a wide-ranging Indo-Pacific species, the Indian Ocean population is now recognized as a separate species, Naso elegans.
Bộ gần gũi / Khối lượng (Trọng lượng) / Age
Maturity: Lm ? range ? - ? cm
Max length : 46.0 cm SL con đực/không giới tính; (Ref. 37792); Khối lượng cực đại được công bố: 2.3 kg (Ref. 125599)
Các tia vây lưng cứng (tổng cộng) : 6; Các vây lưng mềm (tổng cộng) : 26 - 29; Tia cứng vây hậu môn: 2; Tia mềm vây hậu môn: 27 - 30. This species is distinguished by the following characters: D VI (rarely V or VII),26-29(modally 27); A II,27-30 (rarely 27 or 30); pectoral rays usually 17; body depths of adults 2.6-3.0 in SL; head dorsal profile sloping and smoothly convex (forehead no horn nor protuberances); two large peduncular plates, the keels with forward-projecting points in adults; caudal fin emaginate in young and truncate in adults; body brown to bluish gray, ventral half yellowish gray to yellow, the demarcation along middle of side often abrupt and irregular; edge of opercle and preopercle usually with a dark brown band; margin of lower lip broadly white with upper surface of tongue black in adults; gill rakers are blackish basally; blue caudal fin with a broad, brownish yellow, posterior border which narrows toward corners of fin; it is capable of changing overall into light grayish blue, as when at a cleaning station; when in courtship the males quickly display a broad, bluish white zone on the nape and anterior part of the body , followed by narrow bars of the same color that extend onto lower side (Ref. 54980).
Found in areas of coral, rock, or rubble of lagoon and seaward reefs, Ref. 48637. Benthopelagic (Ref. 58302). Adults usually in small groups. Juveniles in shallow rocky reefs, sometimes in small aggregations mixed with other acanthurids of similar size (Ref. 48637). Feed mainly on leafy brown algae (Sargassum and Dictyota). Sometimes in large aggregations (Ref. 37792). Very seldom poisonous (Ref. 4795). Pair-spawning has been observed.
Life cycle and mating behavior
Maturities | Sự tái sinh sản | Spawnings | Egg(s) | Fecundities | Ấu trùng
Probably spawn in pairs (Ref. 240).
Randall, J.E., G.R. Allen and R.C. Steene, 1990. Fishes of the Great Barrier Reef and Coral Sea. University of Hawaii Press, Honolulu, Hawaii. 506 p. (Ref. 2334)
IUCN Red List Status (Ref. 130435)
Human uses
Các nghề cá: buôn bán nhỏ; Bể nuôi cá: Tính thương mại
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Estimates based on models
Preferred temperature (Ref.
123201): 24.5 - 28.9, mean 27.7 °C (based on 734 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02512 (0.01372 - 0.04599), b=2.97 (2.80 - 3.14), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
Mức dinh dưỡng (Ref.
69278): 2.3 ±0.19 se; based on food items.
Generation time: 3.1 ( na - na) years. Estimated as median ln(3)/K based on 1
growth studies.
Thích nghi nhanh (Ref.
120179): Trung bình, thời gian nhân đôi của chủng quần tối thiểu là 1.4 - 4.4 năm (K=0.3).
Fishing Vulnerability (Ref.
59153): Low to moderate vulnerability (34 of 100).
Nutrients (Ref.
124155): Calcium = 39.2 [20.9, 64.0] mg/100g; Iron = 0.548 [0.291, 0.982] mg/100g; Protein = 18.3 [17.0, 19.5] %; Omega3 = 0.107 [0.068, 0.183] g/100g; Selenium = 42.6 [22.1, 79.5] μg/100g; VitaminA = 35.3 [8.6, 134.5] μg/100g; Zinc = 1.18 [0.78, 1.74] mg/100g (wet weight);
