Shorefishes of the Eastern Pacific online information system

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Species: Kyphosus ocyurus, Bluestriped sea-chub, Rainbow sea-chub

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elongate, oval
yellow + 3 blue stripes
C strongly forked

Kyphosus ocyurus (Jordan & Gilbert, 1882)

Bluestriped sea-chub, Rainbow sea-chub

Body an elongate oval, compressed; upper and lower head profiles convex; snout short; mouth very short, horizontal and opens at the front; the top jawbone slips partially under the under-eye bone when the mouth is closed; teeth small, include immovable incisors with flattened tips; teeth on center of roof of mouth; dorsal fin continuous, XI, 13, spines that fold down into a scaly groove; anal fin III, 14; dorsal & anal fins low; tail fin deeply forked; paired fins are relatively short; origin of the pelvics behind the base of the pectoral fin; scales small, thick and rough, covering the body, head (except snout) and soft portions of the median fins; 75-80 scales along mid-side.

Silvery olive on back, white on lower parts; a broad bright blue midlateral stripe with a yellow stripe immediately above and below, and blue band along base of dorsal fin; tail fin bright yellow.

Size: reaches about 70 cm.

Habitat: most common around offshore islands, also frequently seen near floating logs far out to sea.

Depth: 0-30 m.

From southern California to Peru (excluding the bulk of the Gulf of California) and all the oceanic islands. Occasional specimens have also reached Tahiti and Hawaii, and there is a resident population in the Marquesas Islands of Polynesia.

Note: Previously in the genus Sectator.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Mid Water
  • Water column only
  • Surface
  • Near Surface
  • Reef associated (reef + edges-water column & soft bottom)
  • Water column
  • Flotsam
FishBase Habitat
  • Pelagic
Feeding Group
  • Planktivore
  • Data
  • Zooplankton
  • Pelagic fish larvae
  • Bony fishes
  • Data
  • Pelagic crustacea
Egg Type
  • Pelagic larva
  • No data
  • Pelagic
Global Endemism
  • Pacific only (East + Central &/or West)
  • Central + East Pacific (but not West)
  • TEP non-endemic
  • All species
  • "Transpacific" (East + Central &/or West Pacific)
Regional Endemism
  • Continent + Island (s)
  • Island (s)
  • Continent
  • Eastern Pacific non-endemic
  • All species
  • Tropical Eastern Pacific (TEP) non-endemic
  • Resident
Climate Zone
  • South Temperate (Peruvian Province )
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • North Temperate (Californian Province &/or Northern Gulf of California)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
IUCN Red List
  • Not evaluated / Listed
  • Not listed
Length Max
  • 70
Depth Range Min
  • 0
Depth Range Max
  • 30