Squarenose Unicornfish

Description: Characterized by bluish grey to olive grey body color, paler on ventral parts; angular, squarish protuberance at front of head in adults; caudal peduncle with pair of bony plates, each with large keel with forward projecting point; greatest depth of body 2.4 (subadults)-3.0 in SL (Ref. 90102).

Dorsal spines (total): 5; Dorsal soft rays (total): 28 - 31; Analspines: 2; Analsoft rays: 26 - 29

Inhabits steep drop-offs of offshore coral reefs or rocky outcrops (Ref. 37792). Feeds on algae and larger zooplankton (Ref. 37792).

Inhabits steep drop-offs of offshore coral reefs or rocky outcrops (Ref. 37792). Feeds on algae and larger zooplankton (Ref. 37792). Solitary or in groups (Ref. 90102). Minimum depth from Ref. 58018.

分布於印度-西太平洋區，由非洲東部至澳洲大堡礁，北可至台灣南部。台灣發現於南部海域。

不常見之種，一般以流刺網或潛水鏢魚法等捕獲。可食用。

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，隨著成長，在眼前方之額部逐漸突出而形成瘤狀突起。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，背鰭硬棘V，軟條數28-31；臀鰭硬棘II，軟條數26-29。

主要棲息於外礁區斜坡。以藻類及大型動物性浮游生物為食。

Naso mcdadei is a tropical fish found in coral reefs in the Pacific and Indian Oceans. It is commonly known as the squarenose unicornfish.