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Species: Stegastes rectifraenum, Cortez damselfish

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brown + dark scale edges, scattered pale scales
juvenile: blue + ocellus & black spot, D edge blue
pectoral 20
gill rakers 14-18
gill rakers 14-18

Stegastes rectifraenum (Gill, 1862)

Cortez Damselfish

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; gill rakers 14-18; a single continuous dorsal fin, XII, 15 (rarely 16); anal rays II, 13 (rarely 12 or 14); pectoral rays 20 (rarely 19 or 21); 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, grading to lighter brown on head, with scattered noticeably paler scales on body; most of body scales with blackish margins; fins mainly dark brownish, except pectorals slightly yellowish; juveniles bright blue with darker scale margins, a pair of neon-blue stripes on upper part of head and nape, black ocellated spot at base of spiny & soft dorsal junction, and small blue- edged black spot on upper surface of caudal peduncle.

Size: attains length of 16 cm.

Inhabits rocky reefs.

Depth: 0-12 m.

Northern Baja California and the entire Gulf of California south to Acapulco on the Mexican mainland, and rarely in the Revillagigedos.


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Salinity
  • Marine Only
  • Marine
Inshore/Offshore
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
Habitat
  • Reef only
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef (rock/coral/oyster)
  • Rocks
FishBase Habitat
  • Reef Associated
Feeding Group
  • Data
  • Omnivore
Diet
  • Mobile benthic gastropods/bivalves
  • Data
  • Sponges/seasquirts/bryozoa
  • Sessile worms
  • Benthic microalgae
  • Mobile benthic crustacea (shrimps/crabs)
  • Sessile crustacea
Egg Type
  • Benthic
  • Pelagic larva
  • Data
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • All species
  • Island (s)
  • Continental TEP endemic
  • Cortez + Mexican provinces endemic
  • TEP endemic
  • Continent
  • Continent + Island (s)
Residency
  • Resident
Climate Zone
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • North Temperate (Californian Province &/or Northern Gulf of California)
IUCN Red List
  • Least concern
  • Listed
CITES
  • Not listed
Depth Range Max
  • 12
Depth Range Min
  • 0
Length Max
  • 16