Overview

Comprehensive Description

Description

  Common names: serrano (English), serrano (Espanol)
 
Serranus aequidens Gilbert, 1890

Deepwater serrano

Elongate, with a narrow tail base; head long; snout short; eye large (= snout); mouth large, reaches under rear edge of pupil; tip of lower jaw a little projecting; preoperculum finely serrated; gill rakers long & slender, ~ 16 lower rakers; dorsal X, 12, spines weak, flexible, low, increasing in length to the 4th  then decreasing to 9th; anal fin III,7, spines weak, 3rd  longest, ~ 2/3 length of 1st  ray, which is the longest; pectorals long and narrow, reaching from of anal fin; tail fin concave; scales large, rough, those on opercle largest; lateral line ~ 48 scales. 



Head and body pale tan; throat and belly white; preoperculum with small dark dots; operculum with a large blue-grey blotch; about 6 irregular bars on upper body, last on base of tail, second bar with a dark blotch on lateral line above pectoral fin; first dorsal with yellowish margin, centers of membranes between spines blackish; second dorsal with blackish margin and blackish stripe along its base; pectoral and pelvic fins yellowish; tail and anal fins mainly clear.

Size: reaches 24.5 cm.

Habitat: lives on soft bottoms.

Depth: 75-265 m.

From southern California to the western Gulf of California; central Mexico to western Panama; the Galapagos and Cocos Island.   
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Distribution

Range Description

This species is endemic to the Eastern Pacific, and is found from southern California and the western Gulf of California to western Panama, including the Galapagos and Cocos Island.
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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, Continent + Island (s), Continent, Island (s)

Residency: Resident

Climate Zone: North Temperate (Californian Province &/or Northern Gulf of California), Northern Subtropical (Cortez Province + Sinaloan Gap), Northern Tropical (Mexican Province to Nicaragua + Revillagigedos), Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
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Eastern Central Pacific.
  • Heemstra, P.C. 1995 Serranidae. Meros, serranos, guasetas, enjambres, baquetas, indios, loros, gallinas, cabrillas, garropas. p. 1565-1613. In W. Fischer, F. Krupp, W. Schneider, C. Sommer, K.E. Carpenter and V. Niem (eds.) Guia FAO para Identification de Especies para lo Fines de la Pesca. Pacifico Centro-Oriental. 3 Vols. FAO, Rome. (Ref. 9342)   http://www.fishbase.org/references/FBRefSummary.php?id=9342&speccode=8727 External link.
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Eastern Pacific.
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Depth

Depth Range (m): 75 (S) - 265 (S)
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Physical Description

Morphology

Size

Length max (cm): 24.5 (S)
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Type Information

Type; Type for Serranus aequidens
Catalog Number: USNM 44277
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Preparation: Illustration
Year Collected: 1889
Locality: Gulf of California, Mexico, Pacific
Depth (m): 205 to 205
Vessel: Albatross
  • Type:; Type:
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This demersal species lives on soft substrata at depths of 75 to 265m. It feeds on mobile benthic crustaceans, octupus, squid, cuttlefishes, and bony fishes.

Systems
  • Marine
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Environment

demersal; marine; depth range 205 - 205 m (Ref. 58018)
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Depth range based on 14 specimens in 1 taxon.
Water temperature and chemistry ranges based on 7 samples.

Environmental ranges
  Depth range (m): 3 - 271.8
  Temperature range (°C): 12.983 - 15.355
  Nitrate (umol/L): 27.326 - 33.933
  Salinity (PPS): 34.845 - 34.928
  Oxygen (ml/l): 0.373 - 1.197
  Phosphate (umol/l): 2.029 - 2.301
  Silicate (umol/l): 19.087 - 27.850

Graphical representation

Depth range (m): 3 - 271.8

Temperature range (°C): 12.983 - 15.355

Nitrate (umol/L): 27.326 - 33.933

Salinity (PPS): 34.845 - 34.928

Oxygen (ml/l): 0.373 - 1.197

Phosphate (umol/l): 2.029 - 2.301

Silicate (umol/l): 19.087 - 27.850
 
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 associated (reef + edges-water column & soft bottom), Soft bottom (mud, sand,gravel, beach, estuary & mangrove), Soft bottom only, Mud, Sand & gravel

FishBase Habitat: Bathydemersal
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Trophic Strategy

Feeding

Feeding Group: Carnivore

Diet: mobile benthic crustacea (shrimps/crabs), octopus/squid/cuttlefish, bony fishes
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Life History and Behavior

Reproduction

Egg Type: Pelagic, Pelagic larva
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Serranus aequidens

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 9
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
Smith-Vaniz, B, Robertson, R., Dominici-Arosemena, A., Molina, H., Salas, E. & Guzman-Mora, A.G.

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

Contributor/s

Justification
This deep-water species is widespread in the Eastern Pacific. It is not targeted by fisheries due to its small size. There are no major threats known to this species, and no indication of widespread population decline. 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
There is no population information available for this species.

Population Trend
Unknown
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Threats

Major Threats
There are no major threats known for this species.
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
There are no known species specific conservation measures. However, this species' distribution includes a number of Marine Protected Areas in the Eastern Pacific region.
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