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| Common names: snook (English), róbalo (Espanol) |
Centropomus unionensis Bocourt, 1868
Hump-back snook, Union snook
Body oblong elongate, compressed; upper head profile distinctly concave, pronounced hump on nape in adult; mouth large and protractile, lower jaw protruding; margin of preopercle serrated; gill rakers 22-24; dorsal rays VIII + I, 9 (occasionally 10), 3rd dorsal spine ~ equal to 4th; anal rays III, 6 (rarely 5), second anal spine much stouter than third spine and slightly longer, also exceeding longest anal soft ray, almost reaching to tail fin; pelvics insert a little behind pectoral base, with I strong spine and 5 rays; pectoral rays 15-17 (usually 16); lateral-line scales 46-52 (usually 48-51); scales around tail base 22-25 (usually 23-24).
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 36.6 cm.
Inhabits bays, estuaries, and lower reaches of freshwater streams.
Depth: 0-25 m.
The SE Gulf of California to Peru.