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Species: Gambusia yucatana, Yucatan Gambusia

All Families:   All Genera:   All Species:

upper body - large brown spots
male C: lower margin orange
D 7-10
A 10-11
N Yucatan to Belize
male: pectoral 5th ray scalloped, sex organ - no palp, + hooks above tip
lateral scales 28-31

Gambusia yucatana Regan, 1914

Yucatan Gambusia

Head and body moderately robust, moderately compressed at rear; head depressed; front nostril not tubular; covering of eye not continuous with skin of head; mouth small, opens at front, slightly oblique, lower jaw slightly projecting, top jaw protractile; jaw teeth consist of an outer row of large backward curved teeth, and several rows of small pointed teeth; 1 dorsal fin with short base, at rear of body, 8-9 (7-10) rays; anal fin origin distinctly before dorsal fin origin in both sexes, female with 10-11 rays; pelvic origin well behind pectoral base, near anal fin, tips of fins of males not swollen; pectorals high on flank, 14 (13-15), modified in male, with 5th ray scalloped near its tip; 3rd anal ray unbranched; anal fin modified in male to form an elongate sex organ, that greatly elongate organ not slender, pointed with tip curved upwards and with 2 small recurved hooks on its top side, without a fleshy palp; tail base relatively narrow; tail fin rounded; scales smooth and relatively large; 28-31 (usually 29-30) in lateral series.

Light olive, upper body with large dark brown to black spots, scattered or in several rows; a narrow dark bar under eye, if present, restricted to preoperculum (not extending onto operculum); lower margin of tail fin of males bright orange; tail fin with 2-3 vertical rows of dark spots; dorsal fin with 1 dominant row of dark spots, fainter rows may also be present.

Reaches 6.7 cm.

Freshwater mainly, but also in estuaries, mangroves and along beaches in eelgrass.

Depth range: 0-2 m.

SW Gulf of Mexico to Belize.

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  • Brackish
  • Freshwater
  • Non Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Beach
  • Estuary
  • Freshwater
  • Mangrove
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Detritivore
  • Data
  • Detritus
  • Insects
Egg Type
  • Data
  • Live birth
  • No pelagic larva
  • No pelagic phase
Global Endemism
  • All species
  • Greater Caribbean endemic
  • West Atlantic Endemic
Regional Endemism
  • Continent
  • Continent only
  • GC endemic
  • All species
  • Resident
Climate Zone
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 6.7
Depth Range Min
  • 0
Depth Range Max
  • 2