Shorefishes of the Greater Caribbean online information system

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Species: Monomitopus agassizii, Agassiz's Brotula, Threespine Cusk-eel, Threespine Brotula

All Families:   All Genera:   All Species:

eye = /snout
head scaled
opercle - strong spine
preopercle - 2-3 spines at angle
base gill arches: 1 tooth patch
pelvic = 1 filament under preopercle

Monomitopus agassizii (Goode & Bean, 1896)

Threespine Cusk-eel, Agassiz's Brotula, Threespine Brotula

Moderately slender, tapering to a point at rear; head relatively deep, upper profile convex, its length about ½ length before anus; eye equal to or slightly < snout; snout pointed, overhanging mouth; mouth slightly oblique, large, extends behind eye; jaw teeth simple, small, granular and close-set; 1 tooth-patch at lower front of gill arches; long gill rakers 28-33; operculum with 1 straight, rounded, strong spine with a single point; preoperculum with 3 poorly developed spines at lower angle, lower 2 spines larger; dorsal rays 100-106; anal rays 83-89; pelvic fins with 1 ray, shorter than head, close together, under preopercle; pectoral fins nearer center of side than lower profile, 30-35 rays; tail fin continuous with dorsal and anal; body covered with small, smooth, easily shed scales; head wholly covered with scales except lips and under throat; 7-10 oblique scale rows between origin of dorsal fin and lateral line.

Color pale.

Reaches 19.5 cm.

On soft bottoms, in the water column near bottom.

Depth range: 48-1408 m.

The Gulf of Mexico and Caribbean, also in Brazil.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom + water column
  • Near Bottom
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Water column
  • Mud
FishBase Habitat
  • Bentho-Pelagic
Feeding Group
  • Carnivore
  • Data
  • Planktivore
  • Data
  • Zooplankton
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent + Island (s)
  • Extends South of GC
  • GC non-endemic
  • Island (s)
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 19.5
Depth Range Min
  • 48
Depth Range Max
  • 1408