The grunion run happens annually for several months out of the year. Grunion spawn from March through August, with peak spawning (the run) occurring in late March and into June.
During peak spawning, the grunion come up onto the beach on full moon and new moon nights after high tide and the hours following. Female grunion use their bodies to dig a hole in the sand where the male deposits his milt. Ten days later the eggs hatch and are released out into the ocean during high tide.
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