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Species: Gillichthys detrusus, Delta mud-sucker

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nape with scales
eyes look up
uniformly pale
space between Ds 1/2 D1 base
pectoral: top ray tip not free, usually 22 or more
D2 I, 11-12; A I, 10-11
Gillichthys detrusus Gilbert & Scofield, 1898
Delta mud-sucker

Moderately elongate, body compressed; head large (> 25% TL) broad, flattened, upper head profile depressed, ~straight; snout flat, tip very blunt; sensory papillae on head small, crowded, numerous; eyes on upper sides of head, directed upwards; mouth ~ horizontal, opens at front; jaws very long - lower extends ½ way to gill opening, upper to pectoral fin; preopercle covered with skin; teeth small, conical, 4-5 rows on each jaw; first dorsal fin low and rounded, VI (IV-VIII); 2nd dorsal fin I, 11-12; anal fin with short base, I, 10-11; pectoral broad, rounded, usually 22 or more rays, top ray not partly free from fin; pelvics form disc, membrane between pelvic fin spines without side lobes; tail rounded; scales small (~ 90 rows along side), imbedded, rough in juveniles, mainly smooth in adults; narrow strip of non-overlapping imbedded scales on top of nape; scaled space between dorsal fins ~1/2 length of 1st dorsal fin base; skin covered with thick mucous.

Head and body pale olive to gray, without markings, lower 2/3 paler; pectoral fin with upper 1/3 dusted with dark dots; juveniles colored like adults.

Size: 13.5 cm.

Habitat: burrows in shallow mud bottoms in tidal flats and bays, coastal lagoons.

Depth: 0-5 m.

The delta of the Colorado river, Gulf of California.

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  • Non Marine
  • Brackish
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Soft bottom only
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • Mobile benthic worms
  • No Data
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • No data
  • Pelagic larva
  • Benthic
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • TEP endemic
  • Cortez province endemic
  • Continent
  • Continent only
  • Resident
Climate Zone
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Not evaluated / Listed
  • Not listed
Length Max
  • 13.5
Depth Range Min
  • 0
Depth Range Max
  • 5