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Cynoscion nannus Castro-Aguirre and Arvizu-Martinez, 1976
DWARF WEAKFISH
Dwarf corvina

Life   Vertebrata   Fish   Sciaenidae   Cynoscion

Cynoscion nannus
© Copyright Ross Robertson, 2006 · 12
Cynoscion nannus
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Cynoscion nannus
www.fao.org Copyright Michel Lamboeuf · 0
Cynoscion nannus
español

Overview
Main identification features
  • large head and eye
  • d: x-xi
  • mouth: oblique, roof black
  • pectoral greater than pelvic
  • fins scaly; rear body scales rough
Elongate, fusiform, compressed, oval cross-section; head low, long (~35% of standard length), pointed; eye large (25-33% of head length); mouth a little oblique, reaches to middle of pupil; front of top jaws with a pair of large pointed canines; no barbels under chin; preopercle smooth in adult (with 2 spines in juvenile); 14 rakers on 1st gill arch; dorsal low, with long base, deep notch, 2 parts distinctly separate, X-XI, 18-21; anal II,8-10, small, length of base ~snout length; pectorals long, reach past pelvics, pointed, 16-17 rays; tail bluntly angular to rounded, central rays longest; lateral line arched at front; scales rough on rear 3/4 body, smooth in front and head, 49-59 on lateral line, 5-7 scales between lateral line and dorsal origin, inner ½ of membranes of soft dorsal and anal fins scaled.

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 Costa Rica.


Attributes
Abundance: Common.
Cites: Not listed.
Climate Zone: Northern Subtropical (Cortez Province + Sinaloan Gap); Northern Tropical (Mexican Province to Nicaragua + Revillagigedos).
Depth Range Max: 815 m.
Depth Range Min: 100 m.
Diet: bony fishes; mobile benthic crustacea (shrimps/crabs); octopus/squid/cuttlefish; Pelagic crustacea.
Eastern Pacific Range: Northern limit=25; Southern limit=9; Western limit=-111; Eastern limit=-84; Latitudinal range=16; Longitudinal range=27.
Egg Type: Pelagic; Pelagic larva.
Feeding Group: Carnivore.
FishBase Habitat: Bentho-Pelagic.
Global Endemism: Tropical Eastern Pacific (TEP) endemic; East Pacific endemic; All species.
Habitat: Sand & gravel; Soft bottom (mud, sand,gravel, beach, estuary & mangrove); Water column.
Inshore Offshore: Inshore; Inshore Only.
IUCN Red List: Not evaluated / Listed.
Length Max: 27 cm.
Regional Endemism: Continent; Continent only; TEP endemic; Continental TEP endemic; Mexican + Panamic provinces endemic; All species.
Residency: Resident.
Salinity: Marine; Marine Only.
Water Column Position: Mid Water; Near Bottom; Near Bottom; Bottom + water column;


Names
Scientific source:

Links to other sites

References
  • Castro-Aguirre , J. L. and Arvizu-Martinez, J., 1976., Una nueva especie de Cynoscion, del Pacifico de Mexico (Pisces: Sciaenidae: Otholitinae)., Rev. Soc. Mex. Hist. Nat, 37:323-329.
  • Castro-Aguirre, J.L., 1991., Nuevos registros de peces mesopelágicos y bentónicos en el Golfo de California, México., Anales de la Escuela Nacional de Ciencias Biologicas de Mexico, 35:71-89.
  • Findley, L.T., Hendrickx, M.E., Brusca, R.C., van der Heiden, A.M., Hastings, P.A., Torre, J., 2003., Diversidad de la Macrofauna Marina del Golfo de California, Mexico., CD-ROM versión 1.0. Projecto de la Macrofauna del Golfo .  Derechos reservados de los autores y Conservación Internacional.
  • Fischer , W. , Krup , F. , Schneider , W. , Sommer , C. , Carpenter , K. E. and Niem, V. H., 1995., Guia FAO para la Identificacion de Especies de para los fines de la Pesca. Pacifico Centro-Oriental. Volumen III. Vertebrados - Parte 2., FAO3:1201-1813.
  • Galván-Magaña, F., Gutiérrez-Sánchez, F., Abitia-Cárdenas, L.A., Rodríguez-Romero, J., 2000., The distribution and affinities of the shore fishes of the Baja California Sur lagoons. In Aquatic Ecosystems of Mexico: Status and Scope. Eds. M. Manuwar, S.G. Lawrence, I.F. Manuwar & D.F. Malley. Ecovision World Monograph Series., Backhuys Publishers:383-398.

Acknowledgements

I thank Ashley MacDonald and John Pickering, University of Georgia, for technical support in building this page.


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Following modified from FishBase
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http://www.fishbase.org/Summary/speciesSummary.php?genusname=Cynoscion&speciesname=nannus ---> http://52.67.158.155/Summary/speciesSummary.php?genusname=Cynoscion&speciesname=nannus
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https://fishbase.net.br/Summary/speciesSummary.php?genusname=Cynoscion&speciesname=nannus ---> https://fishbase.net.br/summary/Cynoscion-nannus.html
Cynoscion nannus, Dwarf weakfish
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Common name (e.g. trout)

Genus + Species (e.g. Gadus morhua)

Cynoscion nannus Castro-Aguirre & Arvizu-Martinez , 1976

Dwarf weakfish Add your observation in Fish Watcher
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Cynoscion nannus   AquaMaps   Data sources: GBIF OBIS
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Pictures | Google image Image of Cynoscion nannus (Dwarf weakfish) Cynoscion nannus
Picture by Robertson, R.

Classification / Names Common names | Synonyms | Catalog of Fishes( genus , species ) | ITIS | CoL | WoRMS | Cloffa

Teleostei (teleosts) > Eupercaria/misc (Various families in series Eupercaria) > Sciaenidae (Drums or croakers)
Etymology: Cynoscion: Greek, kyon = dog + Greek, odous = teeth + Greek, skion, skiaina = barbel, red mullet (Ref. 45335 ) .

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; benthopelagic; depth range 100 - 812 m (Ref. 9118 ). Deep-water; 25°N - 15°N

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Eastern Central Pacific: Mexico.

Length at first maturity / Size / Weight / Age

Maturity: L m   ? , range 10 - ? cm
Max length : 27.0 cm TL male/unsexed; (Ref. 9118 ); common length : 20.0 cm TL male/unsexed; (Ref. 9118 )

Biology     Glossary (e.g. epibenthic)

Occurs offshore (Ref. 9118 ).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator | Collaborators

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 )

IUCN Red List Status (Ref. 130435 )

  Least Concern (LC)  ; Date assessed: 14 October 2019

CITES

Not Evaluated

CMS (Ref. 116361 )

Not Evaluated

Threat to humans

  Harmless





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Internet sources

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | BOLDSystems | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes : genus , species | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GenBank: genome , nucleotide | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | Tree of Life | Wikipedia: Go , Search | World Records Freshwater Fishing | Zoobank | Zoological Record

Estimates based on models

Preferred temperature (Ref. 123201 ): 9.3 - 11.3, mean 10.8 °C (based on 6 cells). Phylogenetic diversity index (Ref. 82804 ):  PD 50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high]. Bayesian length-weight: a=0.00776 (0.00450 - 0.01340), b=3.03 (2.89 - 3.17), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref. 93245 ). Trophic level (Ref. 69278 ):  4.0   ±0.3 se; based on diet studies. Resilience (Ref. 120179 ):  High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.). Fishing Vulnerability (Ref. 59153 ):  Low vulnerability (17 of 100).

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Updated: 2024-04-24 19:53:31 gmt
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