Leuresthes tenuis (California Grunion) is a species of ray-finned fishes in the family New World silversides. Individuals are known to live for 8 years and can grow to 19.0 cm.
Definition: length from the tip of the snout to the tip of the longer lobe of the caudal fin, usually measured with the lobes compressed along the midline. It is a straight-line measure, not measured over the curve of the body