Pomacentrus brachialis Cuvier 1830

Description: Adults dusky to almost black. Eye with yellow iris and black spot on pectoral fin base (Ref. 48636). Body depth 1.8-2.0 in SL (Ref. 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).

Dorsal spines (total): 13; Dorsal soft rays (total): 13 - 15; Analspines: 2; Analsoft rays: 14 - 15

Found in passages and outer reef slopes (Ref. 7247); also in current prone and clear water reef flats to 40 m depth (Ref. 48636). They occur singly or in small groups (Ref. 37816). Feed on zooplankton and benthic algae (Ref. 7247). Diurnal species (Ref. 54980; 113699).

Adults are found in passages and outer reef slopes (Ref. 7247); also in current prone and clear water reef flats to 40 m depth (Ref. 48636). They occur singly or in small groups (Ref. 37816). Feed on zooplankton and benthic algae (Ref. 7247). 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).

分布於西太平洋區，由印尼到斐濟，北至琉球群島，南至新加勒多尼亞。台灣發現於北部、南部及蘭嶼等地。

小型之雀鯛，無食用價值。有人將其作觀賞魚之用。

體呈橢圓形而側扁，標準體長為體高之1.8-2.0倍。吻短而鈍圓。口中型；頜齒兩列，小而呈圓錐狀。眶下骨裸出，下緣具鋸齒；前鰓蓋骨後緣具鋸齒。體被櫛鱗；鼻部具鱗；側線之有孔鱗片16-17個。背鰭單一，軟條部不延長而略呈角形，硬棘XIII，軟條13-15；臀鰭硬棘II，軟條14-15；胸鰭鰭條16-17；尾鰭叉形，上下葉末端呈圓狀。成魚體暗色至幾乎黑色的；眼睛具黃色的虹彩。胸鰭灰色，基部全為黑色；餘鰭暗色。

主要發現於水道與外礁斜坡區，也可在水流向下且清澈的礁石平臺區至水深40 公尺處的水域。獨居或形成小群魚群生存。以浮游動物與底藻為食。

Found in small groups or solitary in passages and outer reef slopes, and it feeds on zooplankton and benthic algae.