Overview

Comprehensive Description

Description

  Common names: blenny (English), trambollo (Espanol)
 
Exerpes asper (Jenkins & Evermann, 1889)


Sargassum blenny


Elongate, compressed; snout long, pointed, upper profile straight; no cirri on head; lower jaw projecting; teeth in jaws biserial with larger outer series; roof of mouth with teeth on center but not sides; operculum with a distinct spiny projection;  dorsal fin III- IV + XXIV- XXV, 0-2, front 3-4 spines in a high finlet well separated before rest of fin; anal rays II, 17-20; lateral-line scales about 40.

Green with midlateral white stripe from snout to caudal fin base (may be broken into series of spots); a pair of ocellated dark spots on rear half of dorsal fin.


Maximum length, 6.5 cm.

Habitat: common among sargassum weed or eelgrass.

Depth: 1-10 m.

Central Baja and most of the Gulf of California.
   
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Biology

Common among Sargassum weed or eelgrass. Feeds on invertebrates.
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Distribution

Range Description

This species is endemic to the Eastern Pacific, and is found from central to southern Baja California and in the western and central eastern Gulf of California.
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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, Continental TEP endemic, Cortez province endemic, Continent, Continent only

Residency: Resident

Climate Zone: North Temperate (Californian Province &/or Northern Gulf of California), Northern Subtropical (Cortez Province + Sinaloan Gap)
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Eastern Pacific Ocean: from the Gulf of California and outer coast of Baja California.
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Eastern Pacific: Gulf of California.
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Depth

Depth Range (m): 1 (S) - 10 (S)
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Physical Description

Morphology

Size

Length max (cm): 6.5 (S)
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Size

Maximum size: 65 mm NG
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Max. size

6.5 cm TL (male/unsexed; (Ref. 11482))
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Type Information

Type for Auchenopterus asper Jenkins & Evermann
Catalog Number: USNM 39643
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Preparation: Photograph; Radiograph
Collector(s): O. Jenkins & B. Evermann
Locality: Gulf of California, Mexico, Pacific
  • Type: Jenkins, O. P. & Evermann, B. W. 1888 (1889). Proceedings of the United States National Museum. 11 (698): 154.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This benthic species is common in sargassum algae. It reef-associated, and found in shallow rocky reef areas to depths of 10m.

Systems
  • Marine
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Environment

demersal; marine
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Depth range based on 21 specimens in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 1 - 8
  Temperature range (°C): 22.443 - 22.443
  Nitrate (umol/L): 3.645 - 3.645
  Salinity (PPS): 35.261 - 35.261
  Oxygen (ml/l): 4.879 - 4.879
  Phosphate (umol/l): 0.897 - 0.897
  Silicate (umol/l): 7.763 - 7.763

Graphical representation

Depth range (m): 1 - 8
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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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, Macroalgae, Reef associated (reef + edges-water column & soft bottom)

FishBase Habitat: Reef Associated
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Trophic Strategy

Common among sargassum weed or eelgrass. Feeds on invertebrates.
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Feeding

Feeding Group: Carnivore

Diet: mobile benthic worms, mobile benthic crustacea (shrimps/crabs), mobile benthic gastropods/bivalves, sea-stars/cucumbers/urchins, soft corals/hydroids
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Life History and Behavior

Reproduction

Egg Type: Benthic, Pelagic larva
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Exerpes asper

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 6
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2010

Assessor/s
Hastings, P. & Dominici-Arosemena, A.

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

Contributor/s

Justification
This species is restricted to Baja California and the Gulf of California, and is common throughout its range. There are no known major threats to this shallow-water, reef-associated species other than potentially localized declines due to future ENSO and climate change events. It is listed as Least Concern.
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IUCN Red List: Not evaluated / Listed

CITES: Not listed
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Population

Population
No population information is available for this species. This species is considered common within its range.

Population Trend
Unknown
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Threats

Major Threats
There are no major threats known for this species. However, given this species restricted distribution and shallow water habitat, future oceanographic environmental changes such as ENSO/global warming may have detrimental effects on the marine ecosystems and the survival of these shallow water regional endemic species (Chen et al. 2004; Soto, 2001).
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
There are no known conservation measures for this species. However, this species distribution falls partially into a number of Marine Protected Areas in the Eastern Pacific region (WDPA 2006), including the Alto Golfo Marine Protected Area.
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Wikipedia

Exerpes asper

Exerpes asper, the Sargassum blenny, is a species of labrisomid blenny native to the Gulf of California and the Pacific coast of Baja California. It is currently the only known member of its genus.[2]

Description[edit]

The Sargassum blenny has two quite distinct dorsal fins. The face is elongated and the mouth resembles that of a pike. There are no cirri. The general colour is brown with patches of silver on the flanks and there are 2 blue eyespots on the posterior dorsal fin. This fish grows to a length of 6.5 centimetres (2.6 in) TL. [3]

Biology[edit]

The Sargassum blenny lives among sargassum seaweed or in seagrass meadows where it is well camouflaged. It is found among the fronds of floating Sargassum mats. When threatened it tends to curl its head round near its tail and remain motionless, relying on its cryptic appearance to escape detection.[3]

References[edit]

  1. ^ Hastings, P. & Dominici-Arosemena, A. 2010. Exerpes asper. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 21 November 2013.
  2. ^ Froese, Rainer and Pauly, Daniel, eds. (2013). "Exerpes asper" in FishBase. October 2013 version.
  3. ^ a b Thomson, Donald A.; Lloyd T. Findley; Alex N. Kerstitch. Reef fishes of the Sea of Cortez. p. 216. 
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