Grunion The normal lifespan of the grunion is three to four years, although individuals up to five years old have been found. Their growth rate slows after the first spawning and stops completely during the spawning season. Consequently, adult fish grow only during the fall and winter. This growth rate variation causes annuli to form on the scales, which have been used for determining ages. California grunion spawn on beaches from two to six nights after the full and new moon beginning soon after high tide and continuing for several hours. As a wave breaks on the beach, the grunion swim
USS Grunion 1942. Captured Japanese records show no antisubmarine attacks in the Kiska area, and the fate of "Grunion" remained a mystery for 65 years, until the discovery in the Bering Sea in August 2007 of a wreck believed to be her. In October 2008, the U.S. Navy verified that the wreck is the "Grunion". The "Grunion" received one battle star for her World War II service. In 1998 Lieut. Col. Richard Lane purchased for $1 a wiring diagram from a Japanese cargo ship, the "Kano Maru", which had been active during World War II. Hoping to authenticate the document, Lane posted