IUCN threat status:

Least Concern (LC)

Comprehensive Description

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  Common names: major (English), gregory (English), castañeta (Espanol), jaqueta (Espanol)
Stegastes arcifrons (Heller & Snodgrass, 1903)

Yellowtail gregory,     Island major

Body oval, compressed; 1 pair of nostrils; margin of preopercle serrated; margin of bone under eye serrated, without notch it and the bone before it; mouth small, protrusible; teeth in single row, long and close-set; lower gill rakers 12-14; a single continuous dorsal fin, XII, 15 (rarely 16); anal rays II, 13 (rarely 12); pectoral rays 20 (rarely 19); no projecting short spines at upper and lower base of tail fin; caudal fin bluntly forked; scales are moderately large and rough; body scaled, head largely scaled (snout scaled to nostrils), as are the basal parts of the median fins; lateral-line scales 20 (rarely 19); lateral line incomplete, ends under end of dorsal fin base.

Dark brown, head and breast lighter, often with violet color on gill cover;  pale yellowish lips; tail fin  bright yellow; juveniles similar, but yellow of tail extends forward onto posterior part of body and rear of dorsal and anal fins; a large ocellated black spot near the base of the front of the soft dorsal.

Size: to 16 cm.

Habitat: abundant along rocky shores.

Depth: 1-30 m.

Galapagos Islands, Malpelo Island, and Isla del Coco, Isla Gorgona (Colombia) and Isla de la Plata (Ecuador).


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© Shorefishes of the tropical eastern Pacific online information system. www.stri.org/sftep

Source: Shorefishes of the Tropical Eastern Pacific Online Information System

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