So here's the prevailing theory on Dixon Lake, a man-made reservoir on the outskirts of San Diego: that fish that Jed Dickerson caught last May-you know, the 21-pound 11.2-ounce bucketmouth that was the fourth largest bass of all time and perhaps just a few bites of breakfast from breaking the world record? That was the same fish that Mike Long landed two years earlier. It had the matching thumbtack-size black spot on its gill plate, an identical scale sample, and the same slovenly truck driver's belly. Except it was a pound heavier. Dickerson, a 30-year-old, happy-go-lucky casino game manager from Carlsbad, released it, of course. No reason to keep it if it wasn't the world record. But this fall, when a couple of trout fishermen found the fish floating belly-up, the monstrous fish's two-year reign as the queen bass of San Diego was over.