Common names: weakfish (English), cachema (Espanol)
Cynoscion analis (Jenyns, 1842)
Elongate, fusiform, compressed, oval cross-section; head deep, long, 36% of SL; ridge down front of snout; eye moderate; mouth distinctly oblique, lower jaw prominently projecting; front of top jaws with 1 pair of large pointed canines; no barbels or pores on chin; gill rakers long and slender, 8-9 lower rakers; preoperculum smooth; dorsal with long base, a small gap separating the two parts, IX-X + I, 22-24; anal fin with II small (< ½ length of 1st ray) weak spines, 13-15; pectoral fins relatively long, reaching pelvic tip; rear margin of tail slightly concave; all scales smooth; lateral line straights; inner 3/4 of membranes on soft dorsal and anal fins scaled; pored lateral-line scales about 54-63; lateral line scales larger than adjacent scales, and with small accessory scales.
Back silvery blue, silvery below; all fins except pelvic dark grey, pelvic mid grey; tip of lower jaw dark.
Size: 45 cm.
Habitat: coastal, marine; juveniles enter estuaries and shallow bays.
Depth: 1-50 m.
Colombia to Peru.