Naso lopezi Herre, 1927
Elongate unicornfish
Naso lopezi
photo by Honeycutt, K.

Family:  Acanthuridae (Surgeonfishes, tangs, unicornfishes), subfamily: Nasinae
Max. size:  60 cm SL (male/unsexed)
Environment:  reef-associated; marine; depth range 20 - 50 m
Distribution:  Western Pacific: southern Honshu, Japan to the Great Barrier Reef and New Caledonia. Reported from the Similan Islands in the Andaman Sea and Guam. Recently recorded from Tonga (Ref. 53797).
Diagnosis:  Dorsal spines (total): 5-5; Dorsal soft rays (total): 27-30; Anal spines: 2-2; Anal soft rays: 26-30. Lacks a horn, has numerous black close-set spots on the upper half of its body and tail, and is white ventrally. Body elongate, its depth 3.3 to 3.7 times in SL (Ref 9808). Description: Characterized further by bluish grey body color, sometimes displays large whitish patch on side in area around pectoral fin; males assumes dark anterior body during courtship displays; caudal peduncle with pair of bony keels on caudal peduncle, without projecting points (Ref. 90102).
Biology:  Inhabits coastal to outer reef slopes subject to strong currents. Sometimes in large schools (Ref. 48637). Generally uncommon species found in steep outer reef drop-offs (Ref. 9710). Usually found in waters deeper than 6 m. Feeds on zooplanktons (Ref. 90102). Solitary or in groups (Ref. 37816).
IUCN Red List Status: Least Concern (LC); Date assessed: 06 May 2010 Ref. (126983)
Threat to humans:  harmless

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