Cynoscion nannus — Details

Dwarf Weakfish learn more about names for this taxon

Overview

Comprehensive Description

Description

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Common names: weakfish (English), corvina (English), corvina (Espanol)
 
Cynoscion nannus Castro-Aguirre & Arvizu-Martinez, 1976

Dwarf corvina,     Dwarf weakfish,     Deepwater weakfish



Elongate, fusiform, compressed, oval cross-section; head low, long (~ 35% of SL), pointed; eye large (25-33% of head length); mouth a little oblique, reaches to middle of pupil; front of top jaws with 1 pair of large pointed canines; no barbels or pores on chin; 8-10 lower gill rakers; preopercle smooth in adult (with 2 spines in juvenile); dorsal with long base, a small gap separating the two parts, IX-X + I, 18-21;  anal II, 8-10, small, length of base ~ snout length; pectoral fins relatively long, reaching past pelvic tip; rear margin of tail bluntly angular to rounded; scales rough on rear ¾ body, smooth in front and head, 49-59 on lateral line, 5-7 scales between lateral line and dorsal origin, lateral line scales larger than adjacent scales, and with small accessory scales; inner ½ of membranes of soft dorsal and anal fins scaled; lateral line arched at front.

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Dark above, silver below; sides with undulating dark lines along scale rows; roof of mouth and gill chamber black, latter visible through side of gill covers; inner base of pectoral black.

Size: 27 cm.

Habitat: offshore, continental shelf, on bottom and midwater.

Depth: 100-815 m.

The SW and SE Gulf of California to Panama.

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Biology

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Occurs offshore (Ref. 9118).
  • Chao, L.N. 1995 Sciaenidae. Corvinas, barbiches, bombaches, corvinatas, corvinetas, corvinillas, lambes, pescadillas, roncachos, verrugatos. p. 1427-1518. In W. Fischer, F. Krupp, W. Schneider, C. Sommer, K.E. Carpenter and V. Niem (eds.) Guia FAO para identificacion de especies para los fines de la pesca. Pacifico Centro-oriental. 3 volumes. 1813 p. (Ref. 9118)   http://www.fishbase.org/references/FBRefSummary.php?id=9118&speccode=13985 External link.
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Distribution

Range Description

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This species is endemic to the Eastern Pacific, and is found from the Gulf of California to Costa Rica.
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Depth

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Depth Range (m): 100 (S) - 815 (S)
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Zoogeography

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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, 3 provinces (Cortez + Mexican + Panamic) endemic, Continent, Continent only

Residency: Resident

Climate Zone: 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: Mexico.
  • Chao, L.N. 1995 Sciaenidae. Corvinas, barbiches, bombaches, corvinatas, corvinetas, corvinillas, lambes, pescadillas, roncachos, verrugatos. p. 1427-1518. In W. Fischer, F. Krupp, W. Schneider, C. Sommer, K.E. Carpenter and V. Niem (eds.) Guia FAO para identificacion de especies para los fines de la pesca. Pacifico Centro-oriental. 3 volumes. 1813 p. (Ref. 9118)   http://www.fishbase.org/references/FBRefSummary.php?id=9118&speccode=13985 External link.
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Physical Description

Morphology

Size

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Length max (cm): 27.0 (S)
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Size

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Maximum size: 270 mm TL
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Max. size

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27.0 cm TL (male/unsexed; (Ref. 9118))
  • Chao, L.N. 1995 Sciaenidae. Corvinas, barbiches, bombaches, corvinatas, corvinetas, corvinillas, lambes, pescadillas, roncachos, verrugatos. p. 1427-1518. In W. Fischer, F. Krupp, W. Schneider, C. Sommer, K.E. Carpenter and V. Niem (eds.) Guia FAO para identificacion de especies para los fines de la pesca. Pacifico Centro-oriental. 3 volumes. 1813 p. (Ref. 9118)   http://www.fishbase.org/references/FBRefSummary.php?id=9118&speccode=13985 External link.
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Ecology

Habitat

Habitat and Ecology

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Habitat and Ecology
This benthopelagic species occurs offshore in deeper waters to depths of 845m.

Systems
  • Marine
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Depth range based on 10 specimens in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 123 - 400
  Temperature range (°C): 13.799 - 13.799
  Nitrate (umol/L): 31.128 - 31.128
  Salinity (PPS): 34.880 - 34.880
  Oxygen (ml/l): 0.373 - 0.373
  Phosphate (umol/l): 2.244 - 2.244
  Silicate (umol/l): 24.753 - 24.753

Graphical representation

Depth range (m): 123 - 400
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.
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Depth: 100 - 812m.
From 100 to 812 meters.

Habitat: benthopelagic. Inhabits waters that are distant from the coast, on bottoms or in the water column at depths between 100 and 812 m. Reaches sexual maturity at a TL of 10 cm.
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Habitat

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Salinity: Marine, Marine Only

Inshore/Offshore: Inshore, Inshore Only

Water Column Position: Mid Water, Near Bottom, Bottom + water column

Habitat: Soft bottom (mud, sand,gravel, beach, estuary & mangrove), Sand & gravel, Water column

FishBase Habitat: Bentho-Pelagic
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Environment

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benthopelagic; marine; depth range 100 - 812 m (Ref. 9118)
  • Chao, L.N. 1995 Sciaenidae. Corvinas, barbiches, bombaches, corvinatas, corvinetas, corvinillas, lambes, pescadillas, roncachos, verrugatos. p. 1427-1518. In W. Fischer, F. Krupp, W. Schneider, C. Sommer, K.E. Carpenter and V. Niem (eds.) Guia FAO para identificacion de especies para los fines de la pesca. Pacifico Centro-oriental. 3 volumes. 1813 p. (Ref. 9118)   http://www.fishbase.org/references/FBRefSummary.php?id=9118&speccode=13985 External link.
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Trophic Strategy

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Carnivore. Feeds dominantly on crustaceans, specifically juvenile shrimp and stomatopods of the genus Squilla
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Feeding

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Feeding Group: Carnivore

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

Reproduction

Reproduction

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Egg Type: Pelagic, Pelagic larva
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Conservation

Conservation Status

IUCN Red List Assessment

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Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2010

Assessor/s
Chao, L., Espinosa, H., Findley, L., van der Heiden, A.

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

Justification
This species is widespread in the Eastern Pacific, and occurs primarily in deep-water offshore habitat. There are no major threats for this species, and no current indication of population decline. It is listed as Least Concern.
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Conservation status

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IUCN Red List: Not evaluated / Listed

CITES: Not listed
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Population

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Population
No population information is available for this species, however it is assumed that it is moderately common based on research trawling activities in deep water.

Population Trend
Unknown
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Threats

Threats

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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

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Conservation Actions
There are no known conservation measures for this species.
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