Elongate Unicornfish

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).

Dorsal spines (total): 5; Dorsal soft rays (total): 27 - 30; Analspines: 2; Analsoft rays: 26 - 30

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).

fisheries: commercial; aquarium: commercial

分布於印度-西太平洋區，包括安達曼海、印尼西部、菲律賓、台灣、琉球及帛琉等。台灣分布於南部及小琉球海域。

罕見之種，一般以流刺網或潛水鏢魚法等捕獲。可食用或成觀賞用魚。

體呈長橢圓形而側扁；尾柄部有二個盾狀骨板，各有一個龍骨突。頭小，頭背平斜，隨著成長，成魚在前頭部無角狀突起，亦無瘤狀突起。口小，端位，上下頜各具一列齒，齒稍側扁且尖銳，兩側或有鋸狀齒。背鰭及臀鰭硬棘尖銳，分別具V棘及II棘，各鰭條皆不延長，分別為28-31及27-29；尾鰭截形或微內凹，成魚之上下鰭條不延長為絲狀。體側上半部一致為藍灰色且有許多暗色小點，下半部淡色。頭部及尾鰭亦有許多暗色小點。

主要棲息於外礁斜坡海域，棲息深度在6公尺以上，大部分被發現在30公尺以上，較少見到。

Naso lopezi, the elongated unicornfish, is a unicornfish from the western Pacific Ocean. It occasionally makes its way into the aquarium trade. It grows to a length of 60 cm (24 in).