Indo Pacific Sergeant

This species is characterized by having the following features: body depth 1.5-1.8 in SL; forked caudal fin; colour of body blue-green dorsally, shading to silvery white ventrally; five broad bluish black bars the first just behind the head, the narrow fifth on caudal peduncle, the third to fifth extending into the dorsal fin; dorsal part of body between the first and third dark bars often yellow (yellowish hue on anterodorsal part of the body apparent especially during courtship and nesting); caudal fin without dark bands (Ref. 11441, 90102).

Oviparous, distinct pairing during breeding (Ref. 205). Eggs are demersal and adhere to the substrate (Ref. 205). Males guard and aerate the eggs (Ref. 205).

Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.

Dorsal spines (total): 13; Dorsal soft rays (total): 12 - 14; Analspines: 2; Analsoft rays: 11 - 13

Inhabits the upper edge of outer reef slopes and inshore rocky reefs (Refs. 7247, 54301, 127989). Often hovers in small or large schools over the reefs (Refs. 6110, 127989). Juveniles associate with drifting seaweed (Ref. 12114, 12115). Often in midwater feeding aggregations (Ref. 9710, 90102) or swarming among rocks and coral ledges when tending nests (Ref. 90102). Feeds on zooplankton, benthic algae, colonial anemones and small invertebrates (Refs. 1602, 127989). Dwells in shallow waters near rocks, coral reefs, sandy substrates and tide pools (Ref. 127989).

Adults inhabit upper edge of outer reef slopes and inshore rocky reefs. Juveniles associated with drifting seaweed (Ref. 12114, 12115). Benthopelagic (Ref. 58302). Feed on zooplankton, benthic algae, and small invertebrates (Ref. 1602). Often in aggregations (Ref. 9710) feeding at midwater or tending nests among rocks and coral ledges (Ref. 90102). In large numbers at spawning sites that are timed with large tides that carry their pelagic offspring far offshore (Ref. 48636). Oviparous, distinct pairing during breeding (Ref. 205). Eggs are demersal and adhere to the substrate (Ref. 205). Males guard and aerate the eggs (Ref. 205).

fisheries: subsistence fisheries; aquarium: commercial

廣泛分布於印度-太平洋區，自紅海、東非洲至萊恩群島、土木土群島，北至日本南部，南至澳洲。台灣各地海域及離島之岩礁或珊湖礁海岸均有分布。

中小型之雀鯛，可食用，一般不為漁獲對象魚。有人將其作觀賞魚之用。

體呈卵圓形而側扁。吻短而略尖。眼中大，上側位。口小，上頜骨末端不及眼前緣；齒單列，齒端具缺刻。眶下骨具鱗，後緣則平滑；前鰓蓋骨後緣亦平滑。體被大櫛鱗；側線之有孔鱗片18-20個。背鰭單一，軟條部延長而呈尖形，硬棘XIII，軟條14-16；臀鰭硬棘II，軟條13-16；胸鰭鰭條18-20；尾鰭叉形，末端呈尖形，上下葉外側鰭條不延長呈絲狀。體呈灰白至淡黃色，體背偏黃；體側有5條暗色橫帶。胸鰭基底上方有一小黑斑；鰓蓋骨後緣上方無黑點；尾柄上無黑點。尾鰭灰白色。

主要棲息於沿岸岩礁區之淺水域，但亦可棲息在離岸較遠或較深的水域內。常成群聚集以浮游動物或藻類為食。生殖季節時，雄性魚會在礁穴內建立其領域。

Abudefduf caudobimaculatus, commonly known as the Okinawa sergeant, is a species of damselfish in the family Pomacentridae. It is native to the Indo-Pacific, where it is believed to range from East Africa to Yakushima and Lord Howe Island, including Taiwan (where it occurs alongside its congeners Abudefduf nigrimargo and A. vaigiensis) and Indonesia. Although initially described in 1939, it was subsequently considered synonymous with Abudefduf vaigiensis, until a 2017 review conducted by Kunto Wibowo of the Indonesian Institute of Sciences, Hiroyuki Motomura of the Kagoshima University Museum, and Minoru Toda redescribed it as a valid and distinct species. Despite this, it is still listed by FishBase and WoRMS as a synonym of A. vaigiensis.

Inhabits upper edge of outer reef slopes and inshore rocky reefs. Feeds on zooplankton, benthic algae, and small invertebrates (Ref. 1602).