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Species: Fundulus confluentus, Marsh Killifish

All Families:   All Genera:   All Species:

female: narrow dark bars + dark spots, D - ocellus
D 10-12
gill rakers 5
male: 14-18 long wide dark bars, no dark ocellus on D
6-8 chin pores
female: little/no pouch before A

Fundulus confluentus Goode & Bean, 1879

Marsh Killifish

Body moderately slender, compressed; head flattened above, with straight upper profile; snout short, about = eye diameter; cover of eye not continuous with head skin; front nostril not tubular; mouth small, horizontal, opens at front, protrusible, top jaw twisted, lower jaw projecting; chin with 6-8 pores; jaws with outer row of pointed conical teeth, inner band of simple teeth; gill rakers short, 5; no spines in fins; dorsal fin short based, its origin behind midpoint of body, and over or slightly before anal fin origin, 10-12 rays; female with little or no pouch before anal fin; anal fin with 3rd fin ray branched, 9-10 rays; pectoral with narrow base, rounded, inserted low on side; pelvics inserted well behind pectoral base; tail fin bluntly rounded; small smooth scales, 36-40 midlateral rows; lateral line reduced to a series of pits along side of body.

Males are dark olive to green above, with 14-18 (12-24) long, wide dark bars with narrow silvery interspaces along side; belly white, yellow to yellow orange; dorsal fin without ocellus, but with a black blotch in rear lower corner. Females brown to olive above, with poorly defined, narrow dark bars on sides; back with dark spots; belly pale, whitish or yellowish; sometimes with an partial ocellus at lower rear corner of dorsal fin.

Reaches 8 cm.

Fresh to brackish water; grassy bays and backwaters.

Depth range: 0-1 m.

Chesapeake bay to the Gulf of Mexico.

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  • Brackish
  • Freshwater
  • Non Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Submerged vegetation
  • Estuary
  • Freshwater
FishBase Habitat
  • Demersal
Feeding Group
  • Data
  • Omnivore
  • Data
  • Benthic microalgae
  • Insects
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
Egg Type
  • Benthic
  • Data
  • No pelagic larva
  • No pelagic phase
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Continent
  • Continent only
  • Extends North of GC
  • GC non-endemic
  • All species
  • Resident
Climate Zone
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Temperate (>35N)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 8
Depth Range Min
  • 0
Depth Range Max
  • 1