Whoever you talked to at the OC bait shop is correct, fleas are easier to catch at night. That is when all the guys who get them for the tackle shops go out and a lot of them also work at the local tackle shops. They also follow a cycle with the tide and moon phase as to when the best time to catch them. There are also other things to take into account such as wind direction and strength, wave height and beach shape and structure. The guys who get them commercially use custom made rakes much larger than the ones you see for sale in the tackle shops. A good sign as to when the sand fleas are available is when the oyster catchers show up and they showed up about 3 weeks ago. It is too early to get them in any commercial quantity right now as they are deeper in the sand and you will have do dig for them with a shovel or your hands depending on where they are on the beach. If they are in the softer sand of the wash I usually do better with my hands but be careful, you can really tear your hands up if you dig too much.
John
John