Common names: grunion (English), pejerrey (Espanol)
Colpichthys regis (Jenkins and Evermann 1889)
Body deep and strongly compressed; head depressed, and broadly flattened above; top profile ~ straight; eye large (at least 25% of head length); mouth partly below snout, top jaw extendible; edge of top lip folded down; jaw teeth with double, asymmetrical points; hair-like teeth inside throat; 15-19 gill rakers on lower limb of first gill arch, rakers are short, compressed, the inner border of the lower half of the 1st raker serrated; 1st dorsal with ~ VI spines, origin before anal fin origin; anal I, 22; pectoral fins long (1.5x head length; 3 rows of scales below eye; 4 rows of scales on cheeks; 46-57 lateral scales; 6-10 scales between dorsal fins.
Color: Pale, flank with a 1 scale wide silver stripe, bordered above by a dark line.
Reaches 20 cm.
Found in coastal areas and lagoons and mangroves.
Depth range 0-4 m.
Endemic to the upper Gulf of California.