Yellowback Damselfish

Description: Adult overall yellowish white, forehead yellow-orange extending to anterior of back; scales with a blue dot each, pectoral-fin base and axil orange; operculum upper edge spot dark small. Juveniles bright pink (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).

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

Occurs solitarily or in groups in reef margins and upper seaward slopes subject to mild surge (Ref. 9710). Feeds mainly on algae. Diurnal species (Ref. 54980; 113699).

Adults are found in 1-6 m (Ref. 7247) and in coastal to outer reef crests to depths of about 20 m (Ref. 48636). They occur solitarily or in groups in reef margins and upper seaward slopes subject to mild surge (Ref. 9710). Feed mainly on algae. 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). Diurnal species (Ref. 54980; 113699).

aquarium: commercial

廣泛分布於印度-西太平洋區，西起東印度洋的史考特與艾甚摩堡礁，東至所羅門群島，北到日本南部，南至澳洲大堡礁及新加勒多尼亞。台灣各沿岸礁區大半可見。

本身體色豔麗使其成為受歡迎之水族觀賞魚。

體呈橢圓形而側扁，標準體長為體高之2.4-2.7倍。吻短而鈍圓。口中型；兩頜齒小而呈圓錐狀。體被小鱗。眶前骨無鱗，眶下骨具鱗；前鰓蓋骨後緣平滑。頰部有鱗。體被櫛鱗；側線之有孔鱗片15-18個。鰓耙數17-19。背鰭單一，軟條部不延長而呈角形，硬棘XIII，軟條12-15；臀鰭硬棘II，軟條12-15；胸鰭鰭條16-18；尾鰭叉形，上下葉末端呈尖形。頭部及體前半部為豔藍色且具亮點，向後逐漸色淡而轉為淡乳黃色；鰓蓋上緣具一小黑點。幼魚時體前後半部之色澤區分的極為明顯，成魚後色澤轉淡，有時藍色亦褪為暗灰色。

主要棲息於礁緣底部較光禿之岩壁凹入處或面海斜坡有點浪花的水域，棲息深度在1-6公尺左右。獨居或成一小群生活。主要以藻類為食。

Chrysiptera rex, commonly known as the king demoiselle, is a species of damselfish in the family Pomacentridae. It is native to the eastern Indian Ocean and western Pacific, where it lives around reefs. It grows up to 7 centimetres long. It is of commercial importance in the aquarium trade.