Copper Sweeper

This species is distinguished by the following characters: body depth 1.8-2.4 in SL; dorsal soft rays usually 9; pectoral rays 16-18, usually 17; gill rakers 9-7 + 19-26; caudal fin forked. Colour overall of body copper-brown, black spot at pectoral-fin base; anterior edge of first dorsal fin blackish; basal part of anal fin dusky greyish; no black margin on anal and caudal fins (Ref. 90102).

Dorsal spines (total): 6; Dorsal soft rays (total): 9 - 10; Analspines: 3; Analsoft rays: 36 - 45

Occurs inshore (Ref. 75154). Occurs in clear, shallow lagoon and seaward reefs, quite common along the reef margin. Feeds on benthic animals, zooplankton and nekton (Ref. 275).

Occurs in clear, shallow lagoon and seaward reefs, quite common along the reef margin. Feeds on benthic and planktonic crustaceans, other small invertebrates, and fishes at night. By day, it forms aggregations in caves.

fisheries: minor commercial; aquarium: commercial; price category: unknown; price reliability:

廣泛分布於印度-太平洋區， 西起紅海，東到萊恩、馬貴斯及杜夕群島，北起琉球群島，南至羅的豪及拉帕島。台灣各地皆有。

小型魚類，食用價值低，唯持殊的體型，呈銅銀亮片般的外表，以及夜行性魚獨有的大眼睛，當然就成了水族館張羅的美麗觀賞魚。

體延長而側扁，背、腹緣隆起，尾柄細長，喉部中部具稜脊。頭中等大，吻端鈍圓。眼大型，其直徑遠大於吻長。口斜裂，下頜突出，上頜稍可伸出；上下頜、鋤骨及腭骨均有小錐狀齒，舌上無齒。鰓耙細長，具擬鰓；鰓裂寬，鰓膜不相連並在喉峽部游離。前鰓蓋骨後緣具棘1-3枚，主鰓蓋骨無棘。體被櫛鱗，頭側、尾鰭、臀鰭基底上方均被鱗；側線完全延伸至尾鰭後端，側線鱗數60-73，側線上方有鱗列5-6列，側線下方有鱗列15-16列。頭及背部為深褐色或淺褐色，其下則為銀色，其鱗片上有許多銅黑色小斑點，隨魚的增長而增加，尤其以胸部、鰓蓋及頭部更為顯著，最後成古銅色；胸鰭基部有一黑斑。背鰭前緣及末端黑色；臀鰭色淡，不具明顯之黑色緣；尾鰭通常無黑色緣。

主要棲息於清澈水質的潟湖及向海的珊湖礁盤下方或洞穴中，白天不易見其行蹤，夜間則經常成一大群游動覓食。夜行性，以動物性浮游生物、小型底棲甲殼類或小魚等為食。

Occurs in clear, shallow lagoon and seaward reefs to a depth of at least 36 m, but is quite common along the reef margin. Feeds on benthic and planktonic crustaceans, other small invertebrates, and fishes at night. By day, it forms aggregations in caves.