I think they move out to see to spawn? Not quite sure though. Might have to ask an expert on that one.
As far as catching them during the day, I haven't, but a mate of mine hooked up to one at about 6 in the morning during Summer. About 4ft long, jumped clear out of the water before busting me off, from what we assume was due to it getting tail wrapped. Not during the middle of the day, but the sun was pretty well up and shining.
Cheers,
Kaidon