Scarus frenatus Lacepède 1802

Oviparous, distinct pairing during breeding (Ref. 205).

Dorsal spines (total): 9; Dorsal soft rays (total): 10; Analspines: 3; Analsoft rays: 9

Occurs inshore (Ref. 75154). Herbivorous (Ref. 43650).

Usually found on exposed outer reefs, sometimes in very shallow water (Ref. 2334). Juveniles occur among coral and rubble of lagoon reefs. Grazes on benthic algae (Ref. 30573). Generally solitary (Ref. 1602). Often in schools of mixed species when feeding (Ref. 48636).

fisheries: commercial; aquarium: commercial

Scarus frenatus Lacepède

Scarus frenatus Lacepède, 1802, pp. 3, 12, pl. 1: fig. 1.—Schultz, 1958, p. 83, fig. 13.—Randall, 1963, p. 226, pl. 1D, E.

Callyodon frenatus.—Smith, 1959, pp. 271, 279, pl. 41C—Fourmanoir, 1957, p. 187 [Nossi-Bè].

Scarus sexvittatus Rüppell, 1835, p. 26.—Randall, 1963, pl. 1D, E.

Callyodon sexvittatus—Smith, 1959, pp. 270, 279, fig. 2, pl. 41H, I.

Callyodon vermiculatus Fowler and Bean, 1928, p. 472, pl. 49 [holotype USNM 89978].—Smith, 1956, p. 11, pl. 41C.

Scarus vermiculatus.—Schultz, 1958, p. 82, pl. 16A.—Kamohara, 1963, p. 14, pl. 5: fig. 1 [Japan].—Woodland and Slack-Smith, 1963, p. 46 [Heron Island].

Callyodon upolensis [not Jordan and Seale] Smith, 1956, p. 11, pl. 41H, I.

Scarus randalli Schultz, 1958, p. 97, fig. 20, pls. 19C, 27A.

Characterized by having 6 or 7 median predorsal scales, 3 rows on cheek with 2 or 3 scales in ventral row, ii,12 pectoral rays, rarely ii,13; lips not covering teeth, white in young and females, green in adult males. Color pattern of adult males and females strikingly different: juveniles and adult females reddish brown, 5 dark lengthwise streaks alternating with light yellowish brown interspaces; all fins red; caudal peduncle and basal portion of caudal fin abruptly light yellowish or whitish. Mature males bright green, spotted with orange dorsally above lower edge of eye, below which head is green (pale in alcohol) with red markings; scales with vermiculations on lower sides. Caudal peduncle and caudal fin bright green (pale in alcohol), with an orange new-moon-shaped mark occupying basal part of that fin; anal and dorsal orange margined with blue; edges of both lips narrowly red then submarginally green.

Smith (1959, pp. 270, 279, fig. 2, pl. 41 H, I) has correctly referred S. randalli Schultz to the synonymy of this species and Randall (1963, p. 226) has shown that S. frenatus Lacepède is the adult male and S. sexvittatus is the female and immature stages.

Through an oversight, Pseudoscarus frenatus (not Lacepède) Bleeker, 1862 (p. 40, pl. 16: fig. 2), was not removed by Schultz (1958, p. 83) from the synonymy of S. frenatus Lacepède to that of S. flavipectoralis Schultz, 1958 (p. 52), where it belongs.

Callyodon pectoralis [not Cuvier and Valenciennes] Smith, 1956 (p. 15, pl. 42J), has been found to be an illustration of S. cyanognatus Bleeker, to which it is assigned in this paper.

I have studied recently collected specimens as follows: Dr. Steinitz loaned one 290-mm specimen from the Red Sea; two 96- and 210-mm specimens were collected by the IIOE in the Aldabra Islands; USNM 202666 was collected by the IIOE at the Comoro Islands; one specimen from Sta. HA67–5, Diego Garcia Atoll, 13 June 1967, is 290 mm in length. Dr. Randall collected three, 255–295 mm, at Papeete, USNM 202693 and 202694.

RANGE.—Central and western Pacific Ocean, Indian Ocean, and Red Sea.

分布於印度-太平洋區，由紅海到萊恩群島與迪西島，北至日本南部，南至西澳大利亞的鯊魚灣、羅得豪島與拉帕群島。台灣除西部海域外，其他各海域及離島均有記錄。

主要捕獲的漁法是延繩釣、一支釣、流刺網及籠具等，而本種魚亦是潛水鏢魚的對象以及水族館展示魚種。

體延長而略側扁。頭部輪廓呈平滑的弧型。後鼻孔並不明顯的大於前鼻孔。齒板之外表面平滑，上齒板幾被上唇所覆蓋；大成魚之上齒板具0-2犬齒；每一上咽骨具1列臼齒狀之咽頭齒。背鰭前中線鱗約6-7；頰鱗3列，上列為5-6鱗；中列為6-7鱗；下列為2-4鱗。胸鰭具14-15軟條。尾鰭於幼魚為截形，成魚微凹、雙截形或半月形。幼期身體前半部為紅褐色，後半部為淺紫藍色，並佈有白色之小斑點。背鰭及臀鰭之硬棘鰭膜具白色及紅色斑紋；尾鰭鰭膜透明。初期階段(IP, Initial phase)的雌魚體色為鮮紅色至紅褐色，體側具5-7道深褐色的點狀條紋；尾鰭略淡色；各鰭為紅色。終期階段(TP, Terminal phase)的雄魚體色為綠色；頭部上半部及身體前2/3部位具橘色的蠕狀線條；頭部下半部綠色而散佈不規則之橙紅色線紋，上下唇另具橙紅色斑帶；尾鰭藍綠色，具一橘色之弧形斑。齒板於IP期為白色，TP期為藍色。

主要棲息於裸露的外海岩礁區，有時在很淺的水域中；稚魚則出現在潟湖內珊瑚與碎石之中。以啃食水底的藻類為生。通常為獨居性，但當進食時，常混入魚群中。

Scarus frenatus is a species of parrotfish. Common names include bridled parrotfish, sixband or six-banded parrotfish or vermiculate parrotfish.

Usually found on exposed outer reefs, sometimes in very shallow water (Ref. 2334). Juveniles occur among coral and rubble of lagoon reefs. Generally solitary (Ref. 1602).