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Centropomus unionensis Bocourt, 1868
UNION SNOOK
Life   Vertebrata   Fish   Centropomidae   Centropomus

Centropomus unionensis
© Copyright Ross Robertson, 2006 · 12
Centropomus unionensis
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Overview
Main identification features
  • head profile concave
  • 1st dorsal fin : 3rd spine ~ 4th, black blotch
  • ll: clear
  • a: 2nd spine thick, longest, almost to c
Head profile concave, pronounced hump on nape in adult, dorsal rays VIII + I,9 (occasionally 10), 3rd dorsal spine ~equal to 4th; anal rays III,6 (rarely 5); pectoral rays 15-17 (usually 16); total rakers (including rudiments) on first gill arch 22-24; lateral-line scales 46-52 (usually 48-51); scales around tail base 22-25 (usually 23-24); second anal spine much stouter than third spine and slightly longer, also exceeding longest anal soft ray, almost reaching to tail fin.

Generally silvery with yellowish hue on head; lateral line clear; pectoral, pelvic, and anal fins yellowish; first dorsal fin with black blotch at tip.

Size: attains at least 36 cm.

Inhabits bays, estuaries, and lower reaches of freshwater streams.

Depth: 0-25 m.

El Salvador to Peru.


Attributes
Abundance: Common.
Cites: Not listed.
Climate Zone: Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo); South Temperate (Peruvian Province ).
Depth Range Max: 25 m.
Depth Range Min: 0 m.
Diet: mobile benthic crustacea (shrimps/crabs); bony fishes.
Eastern Pacific Range: Northern limit=14; Southern limit=-9; Western limit=-90; Eastern limit=-78; Latitudinal range=23; Longitudinal range=12.
Egg Type: Pelagic; Pelagic larva.
Feeding Group: Carnivore.
FishBase Habitat: Demersal.
Global Endemism: Tropical Eastern Pacific (TEP) endemic; East Pacific endemic; All species.
Habitat: Beach; Estuary; Mud; Sand & gravel; Soft bottom only; Soft bottom (mud, sand,gravel, beach, estuary & mangrove); Mangrove.
Inshore Offshore: Inshore; Inshore Only.
IUCN Red List: Not evaluated / Listed.
Length Max: 36 cm.
Regional Endemism: Continent; Continent only; TEP endemic; Continental TEP endemic; Panamic province endemic; All species.
Residency: Resident.
Salinity: Brackish; Marine; Freshwater.
Water Column Position: Near Bottom; Bottom only;


Names
Scientific source:

Links to other sites

References
  • Bocourt,., 1868., Note sur des poissons percoides appartenant au genre Centropome, provenant du Mexique et de l'Amérique centrale., Ann. Sci. Nat. (Zool.) (Sér. 5), 9:90-91.
  • Béarez, P., 1996., Lista de los Peces Marinos del Ecuador Continental., Revista de Biologia Tropical, 44:731-741.
  • Castri-Aguirre, J.L., Espinoza-Pérez, H. and Schmitter-Soto, J.J., 2002., Lista sitemática, biogeográfica y ecológica de la ictiofauna estuarino lagunar y vicaria de México. En: Lozano-Vilano, M. L. (Ed.). Libro Jubilar en Honor al Dr. Salvador Contreras Balderas., Universidad Autonoma de Nuevo León:117-142.
  • Castro-Aguirre , J. L. and Balart, E. F., 1997., Contribución al conocimiento de la ictiofauna de fondos blandos y someros de la Ensenada de La Paz y Bahía de La Paz, B.C.S.. En Urbán Ramírez, J. y M. Ramírez Rodríguez (Eds.). La Bahía de La Paz investigación y conservación., Universidad Autónoma de Baja California Sur:139-150.
  • Castro-Aguirre, J.L., 1999., Ictiofauna estuarino-lagunar y vicaria de México., Editorial Limusa S.A. de C.V.: 1-629pp.
  • Donaldson, K.A. and Wilson Jr., R.R., 1999., Amphi-panamic geminates of snook (Percoidei: Centropomidae) provide a calibration of the divergence rate in the mitochondrial DNA control region of fishes., Molecular Phylogenetics and Evolution, 13:208-213.
  • 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 II. Vertebrados - Parte 1., FAO2:647-1200.
  • Fowler, H.W., 1916., Cold-Blooded Vertebrates from Costa Rica and the Canal Zone., Proc. Acad. Nat. Sci. Phila., 68:389-414.
  • Jimenez-Prado, P., Béarez, P., 2004., Peces marinos del Ecuador continental / Marine fishes of continental Ecuador., SIMBIOE/NAZCA/IFEA tomo 1 y 2.
  • Jordan , D.S. and Evermann, B.W., 1896., The fishes of North and Middle America: a descriptive catalogue of the species of fish-like vertebrates found in the waters of North America, north of the Isthmus of Panama. Part I., Bull. U.S. Nat. Mus., 47:1-1240.
  • Jordan , D.S. and Gilbert, C.H., 1882., List of Fishes now in the Museum of Yale College, Collected by Prof. Frank H. Bradley, at Panama, with Descriptions of Three New Species., Proc. U.S. Nat. Mus., 5:620-632.
  • Jordan , D.S. and Gilbert, C.H., 1883., List of the fishes now in the museum of Yale College, collected by Prof. Frank H. Bradley at panama, with descriptions of three new species., Proc. U.S. Nat. Mus., 5(1882):620-632.
  • Lopez , M. I. and Bussing, W. A., 1982., Lista provisional de los peces marinos de la Costa Rica., Revista de Biologia Tropical, 30(1):5-26.
  • Meek , S.E. and Hildebrand, S.F., 1925., The marine fishes of Panama. Part II., Field Mus. Nat. Hist., Zool. Ser. Publ., XV:331-707.
  • Ricker, K.E., 1959., Mexican shore and pelagic fishes collected from Acapulco to Cape San Lucas during the 1957 cruise of the "Marijean"., Univ. Brit. Columbia Inst. Fish., Mus. Contrib., 3:18pp.
  • Rojas , J. R. , Pizarro , J. F. and Castro, M.V., 1994., Diversidad y Abundancia íctica en tres áreas de manglar en el Golfo de Nicoya, Costa Rica., Revista de Biologia Tropical, 42:663-672.
  • Rubio , R. E. A. and Estupiñan, F., 1990., Ictiofauna del Parque Nacional Natural Sanquianga, un Analisis de su Estructura y Perspectivas para su Manejo., Memorias del VII Seminario Nacional de las Ciencias y Tecnologías del Mar. Comisión Colombiana de Oceanografía. Bogota, Colombia., :660-670.
  • Rubio, E.A., 1988., Estudio taxonomico de la ictiofauna acompañante del camaron en areas costeras del Pacifico de Colombia., Memorias del VI Seminario Nacional de las Ciencias del Mar. Comisión Colombiana de Oceanografía. Bogota, Colombia., :169-183.
  • Tringali , M. D. , Bert , T. M. , Seyoum , S. , Bermingham , E. and Bartolacci, D., 1999., Molecular phylogenetics and ecological diversification of the transisthmian fish genus Centropomus (Perciformes: Centropomidae)., Molecular Phylogenetics and Evolution, 13:193-207.

Acknowledgements

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


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