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Species: Bathygobius mystacium, Island frillfin

All Families:   All Genera:   All Species:

nape scales -> well before preopercle edge
body: 3 saddles above, 6 square blotches below
D: 1-3 stripes, edge yellow
C base: 2 dark spots
top jaw short
pectoral 17-20
lateral scales 35 (33-36)

Bathygobius mystacium Ginsburg, 1947

Island frillfin

Body robust; head broad, depressed, with pores; snout bluntly rounded; eyes large, close together; mouth moderate sized, relatively horizontal, top jaw 9.2-11 (rarely to 11.7) % of SL; tongue is notched; jaw teeth in bands, without canines; teeth in upper jaw in a narrow band, outermost teeth enlarged, without canines; gill membranes broadly joined to body under throat, with 5 rays; dorsal fin VI (none elongate) + I, 8-9; length of 2nd dorsal base > distance from 2nd dorsal base to tail fin;  anal I, 7-8; pectoral 17-20, upper 4 (3-5) rays free, silky threads; pelvic fins I, 5, united to form a disc; tail fin rounded; scales large, rough, 35 (33-36) in lateral series, present on midline of nape to well before a line through rear edge of preopercle; no scales on cheek or operculum;  no lateral line.

Grayish brown; upper half of body with 3 distinct dark saddles; lower body with a row of 6-7 irregular to squarish, dark, pupil-to eye-sized blotches; 1st dorsal fin with 1-3 dark spotted stripes and a yellow outer edge, sometimes uniform dark in large fish; a large dark blotch on lower 2/3 of tail fin base that joins a small blotch above it on tail base, outer part of tail fin with 3-4 narrow dark bars; yellowish scale edges form zigzag yellow lines along body.

Reaches 7 cm.

Depth range: 0-3 m.

Habitat: shallow sand/rock habitats on the seaward sides of islands.

Florida to the S Caribbean.


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Salinity
  • Marine
  • Marine Only
Inshore/Offshore
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
Habitat
  • Reef (rock/coral/oyster)
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Reef and soft bottom
  • Rocks
  • Sand & gravel
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
Diet
  • Mobile benthic crustacea (shrimps/crabs)
  • Insects
Egg Type
  • Pelagic larva
  • No data
  • Benthic
Global Endemism
  • West Atlantic Endemic
  • Greater Caribbean endemic
Regional Endemism
  • Continent + Island (s)
  • Insular primarily
  • GC endemic
  • Continent
  • Island (s)
Residency
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Not evaluated / Listed
CITES
  • Not listed
Length Max
  • 7
Depth Range Min
  • 0
Depth Range Max
  • 3