Last night’s grunion run at La Jolla Shores. California grunions are bait fish that swim onto SoCal beaches to breed, for a few days at a time, between March and August. They’re persnickety — to spur a grunion run, the moon cycle, tide cycle, and water temperature have to align juuust right. And last night, they did. The May full moon — the “flower moon” — rose yesterday, and the grunion marathon began. They’re expected to run tonight and tomorrow night, too. Head to a beach (ideally a flat, san