|
Naso tonganus (Valenciennes, 1835) Bulbnose unicornfish |
|
|
photo by
Randall, J.E. |
| Family: | Acanthuridae (Surgeonfishes, tangs, unicornfishes), subfamily: Nasinae | |||
| Max. size: | 60 cm SL (male/unsexed) | |||
| Environment: | reef-associated; marine; depth range 2 - 40 m | |||
| Distribution: | Western Indian Ocean: Mauritius, Seychelles and Mozambique (probably wider distribution in this part of the ocean). | |||
| Diagnosis: | Dorsal spines (total): 5-5; Dorsal soft rays (total): 27-30; Anal spines: 2-2; Anal soft rays: 26-28. Description: Characterized by grey shading to yellowish grey on ventral parts; area below hump on back densely spotted with black; broad pale blue margin on blackish dorsal fin; caudal fin with broad submarginal blackish zone; large bulbous snout and hump on back; caudal peduncle with pair of bony plates, each with forward projecting point; greatest depth of body 2.2 (subadult)-3.0 in SL (Ref. 90102). | |||
| Biology: | Inhabits coral reefs (Ref. 37792). Feeds on leafy or fleshy algae and zooplankton (Ref. 37792). Found singly or in small groups (Ref. 37792). | |||
| IUCN Red List Status: | Least Concern (LC); Date assessed: 06 May 2010 Ref. (130435) | |||
| Threat to humans: | harmless | |||