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Species: Akko rossi, Black-fin specter-goby

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all fins black except pelvics
D & A - 15



Akko rossi Van Tassell & Baldwin, 2004

Black-fin specter-goby

Body elongate; eyes very small; head without pores; vertical and horizontal rows of small papilla on head and operculum; mouth large, almost vertical; teeth elongate, large, depressible, lower teeth overlapping the upper jaw when closed; upper jaw slightly extendible, ends before level of center of eye; upper jaw with one row of depressible, long, well separated canines, lower with two rows, the outer row enlarged; gill opening from a little below top of pectoral base to a little above pelvic base, lower rear edge curved back; gill arches with simple to complex papillae rather than rakers; gill membranes broadly joined to body under throat, with 5 rays; dorsal, anal and tail fins with serially branched rays; 1st dorsal VII, 15, dorsal fins connected along lower half of 1st ray of second fin; length of 2nd dorsal base > distance from 2nd dorsal base to tail fin;  anal fin I, 15; dorsal and anal fins joined to tail fin; pectoral fins short; pelvics fused in a deeply cupped, circular disc on a stalk, fin rays multiply branched; scales small, rounded, smooth, imbedded, not overlapping; head and pectoral base scaleless; no lateral line.

Body translucent, paler below; speckled with black on upper half of head and body; all fins black except the pelvics.

Size: 12 cm.

Habitat: mud bottoms, estuaries.

Depth: 5-10 m.

Known only from the Gulf of Fonseca, El Salvador.

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  • Marine
  • Brackish
  • In & Offshore
  • Inshore
  • Offshore
Water Column Position
  • Bottom
  • Bottom only
  • Soft bottom only
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Mud
  • Estuary
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Planktivore
  • Carnivore
  • No Data
  • Pelagic fish eggs
  • Zooplankton
Egg Type
  • No data
  • Pelagic larva
  • Benthic
Global Endemism
  • All species
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
Regional Endemism
  • Panamic province endemic
  • Continental TEP endemic
  • TEP endemic
  • All species
  • Continent only
  • Continent
  • Resident
Climate Zone
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
IUCN Red List
  • Listed
  • Data deficient
  • Not listed
Depth Range Max
  • 10
Depth Range Min
  • 5
Length Max
  • 12