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  Common names: grunt (English), roncacho (Espanol), corocoro (Espanol), ronco (Espanol)
Pomadasys bayanus Jordan & Evermann, 1898

Purple-mouth grunt,     Freshwater grunt

Elongate, strongly compressed; mouth long, reaches under center of eye, inside not red, lips thin; chin with 2 pores at front and 2 inside hole behind, plus a longitudinal groove; preopercle weakly or not serrated, ventral serrations not forward pointing; dorsal fin XII-XIII, 12, moderately notched; anal III, 7, second anal spine very long and stout, its length about two times eye diameter or more; pectoral fins relatively short, not reaching tips of depressed pelvic fins; pelvics short, not reaching anus (except in small juveniles); no scales on soft dorsal and anal fins; 50-51 pored lateral line scales; 8 oblique rows of scales between lateral line and origin of dorsal fin.

Silvery, with an orange tint on sides; fins orangish; juvenile with wavy stripes.

Size: grows to 36 cm.

Habitat: tolerates salinities between 20-30 ppt, but travels considerable distances up fast moving rivers.

Depth: 0-10 m.

Southern Baja to Peru.


Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© Shorefishes of the tropical eastern Pacific online information system.

Source: Shorefishes of the Tropical Eastern Pacific Online Information System

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