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Edible Pacific fish (Leuresthes tenuis) found along the western coast of the U.S. In the warm months, it lays its eggs in beach sand during a full or new moon when the tide cycle is at its peak. The young hatch and enter the ocean on the next spring tide, two weeks later. Grunion reach a length of about 8 in. (20 cm).
This entry comes from Encyclopædia Britannica Concise. For the full entry on grunion, visit Britannica.com.