How to Identify California Grunion

To identify California Grunion (Leuresthes tenuis), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Silvery-blue dorsally, fading to bright silver on the sides and belly. A prominent iridescent silver stripe runs along the lateral line from the operculum to the caudal fin base.

Scale type

cycloid

Mouth position

superior

Distinctive features

Slender, elongated body, Small, pointed head, Two widely separated dorsal fins, Large eyes, Absence of an adipose fin

Dorsal fin

Two dorsal fins; the first is short with 5-7 weak spines, and the second is longer with 9-12 soft rays. They are widely separated.

Tail fin

Forked caudal fin.

Pectoral fin

Small, located low on the body.

Distinctive fins

Pelvic fins are small and located abdominally.

Identification Tips

1. 1

   Body Shape and Coloration

   Look for a slender, silvery fish with a distinct iridescent silver stripe along its side. Adults typically range from 12-18 cm (5-7 inches) in length.

2. 2

   Fin Arrangement

   Note the two widely separated dorsal fins and the small, low-set pectoral fins.

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