Generally, the brighter the moon the worse the daytime fishing. If it's bright at night, the fish like to feed at night because they've got the cover of darkness, but can still see well enough to locate prey. So, they'll feed at night and not during the day which can make for some tough fishing during the daytime. During dark nights it's generally the opposite, and the fish will feed more during the day. This is all just stuff that people say, and I don't know if it's scientific fact, but fishing does usually suck when there's a full moon. Different fish are effected differently too. I think guys like to fish bluefin during a new moon or something, and other stuff like that, but for the most part bright moons equal bad fishing. If, say, hypothetically, I were to plan a seabass charter on the Stardust ;-) I'd just stay away from any type of moon and plan it for a regular part of the month. Seabass are too weird, and the moon would probably screw with them way too much.
-Brian