Overview

Comprehensive Description

Description

  Common names: goby (English), gobio (Espanol)
 
Lythrypnus gilberti (Heller & Snodgrass, 1903)


Galapagos blue-banded goby



Body robust; head round; with fleshy crest along top of head and nape;  mouth very oblique; head without pores; papillae around mouth, on cheeks and operculum and over eye; front nostril a long tube, rear nostril a raised rim; tongue round to blunt; 5-7 gill rakers; dorsal fin VI (1st  2-3 spines filamentous in male)+ I, 14-15 rays; 11 anal rays; 18-19 pectoral rays; pelvics fused into disc; pectoral rays unbranched; tail fin short, round, with 17 segmented rays; scales rough, body covered, none on head, nape, chest and pectoral base.

Head pinkish orange to red, with blue spots around eye and short blue bars on nape &/or operculum; body purplish brown with 8-10 narrow, dark-edged white bars.


Size: to 4.5 cm.

Inhabits rocky reefs.

Depth: 1-40 m.

Galapagos Islands.
   
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Biology

Tiny, bold and aggressive fish (Ref. 28023) which lives in small recesses of rocky reefs, slopes and walls (Ref. 5227). Feeds on various small crustaceans (Ref. 28023).
  • Allen, G.R. and D.R. Robertson 1994 Fishes of the tropical eastern Pacific. University of Hawaii Press, Honolulu. 332 p. (Ref. 11482)
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Distribution

Range Description

This species is endemic to the Galápagos Islands.
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Zoogeography

See Map (including site records) of Distribution in the Tropical Eastern Pacific 
 
Global Endemism: All species, East Pacific endemic, Tropical Eastern Pacific (TEP) endemic

Regional Endemism: All species, TEP endemic, TEP oceanic island (s) endemic, Galapagos Islands endemic, Island (s), Island (s) only

Residency: Resident

Climate Zone: Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
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Southeast Pacific: Galapagos Islands.
  • Allen, G.R. and D.R. Robertson 1994 Fishes of the tropical eastern Pacific. University of Hawaii Press, Honolulu. 332 p. (Ref. 11482)
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Galápagos Islands.
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Depth

Depth Range (m): 1 (S) - 40 (S)
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Physical Description

Morphology

Size

Length max (cm): 4.5 (S)
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Size

Maximum size: 45 mm NG
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Max. size

4.5 cm TL (male/unsexed; (Ref. 11482))
  • Allen, G.R. and D.R. Robertson 1994 Fishes of the tropical eastern Pacific. University of Hawaii Press, Honolulu. 332 p. (Ref. 11482)
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This reef-associated species lives in small recesses of rocky reefs, slopes and walls to depths of 75 m.

Systems
  • Marine
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Environment

reef-associated; marine; depth range 1 - 40 m (Ref. 5227)
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Depth range based on 8 specimens in 1 taxon.
Water temperature and chemistry ranges based on 5 samples.

Environmental ranges
  Depth range (m): 2 - 390
  Temperature range (°C): 22.344 - 24.111
  Nitrate (umol/L): 4.346 - 6.523
  Salinity (PPS): 34.218 - 34.632
  Oxygen (ml/l): 4.215 - 4.710
  Phosphate (umol/l): 0.613 - 0.824
  Silicate (umol/l): 4.346 - 5.791

Graphical representation

Depth range (m): 2 - 390

Temperature range (°C): 22.344 - 24.111

Nitrate (umol/L): 4.346 - 6.523

Salinity (PPS): 34.218 - 34.632

Oxygen (ml/l): 4.215 - 4.710

Phosphate (umol/l): 0.613 - 0.824

Silicate (umol/l): 4.346 - 5.791
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Depth: 1 - 40m.
From 1 to 40 meters.

Habitat: reef-associated.
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Salinity: Marine, Marine Only

Inshore/Offshore: Inshore, Inshore Only

Water Column Position: Bottom, Bottom only

Habitat: Reef (rock &/or coral), Reef only, Rocks, Reef associated (reef + edges-water column & soft bottom)

FishBase Habitat: Reef Associated
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Trophic Strategy

Feeding

Feeding Group: Carnivore, Planktivore

Diet: mobile benthic crustacea (shrimps/crabs), zooplankton
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Life History and Behavior

Reproduction

Egg Type: Benthic, Pelagic larva
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
D2

Version
3.1

Year Assessed
2010

Assessor/s
Van Tassell, J.

Reviewer/s
Carpenter, K., Polidoro, B. & Livingstone, S. (Global Marine Species Assessment Team)

Contributor/s

Justification
This species is only known from one location (Galápagos Islands). Regional experts support the plausible threat of the increased duration and frequency of ENSO events that can cause severe and rapid declines for restricted-range, shallow-water species in this region of the Eastern Tropical Pacific. This species is listed as Vulnerable under Criterion D2.
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IUCN Red List: Not evaluated / Listed

CITES: Not listed
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Population

Population
This fish was studied in various sites in the Galápagos archipelago, being the most abundant endemic species, with an overall mean density of 15.2 individuals per 500 m² (Edgar et al. 2004).

Population Trend
Unknown
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Threats

Major Threats
In the Eastern Tropical Pacific, severe localized fish species declines have occurred after strong ENSO events that result in shallow waters that are too warm and nutrient poor for extended periods of time (Grove 1985, Edgar et al. 2009). The frequency and duration of ENSO events in this region of the Eastern Tropical Pacific (e.g. the up-welling zone off the coast of Peru, Ecuador, Colombia, Panama and the offshore islands) appears to be increasing (Glynn and Ault 2000, Soto 2001, Chen et al. 2004). Given this species' restricted distribution and shallow water habitat, oceanographic environmental changes, such as those associated with future ENSO events, may have detrimental effects on the survival of this species.
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Vulnerable (VU) (D2)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Management

Conservation Actions

Conservation Actions
There are no known specific conservation measures for this species. However, this species' distribution falls into a number of Marine Protected Areas in the Galápagos Islands complex (WDPA 2006).
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