Small gray and white Clousers 2 and three inch, Match the small bait swirling in the lights. My favorite time of year to fly fish fork on the fly is either during the Spawn which you can fish by boat or bank. Or fishing below docks that have lights underwater. If you can find a couple docs side-by-side that have lights underwater start fishing them 20 minutes after dark. You will catch lots of bass 2-8 pounds on average and tons of white bass to 3 pounds. I like to be able to see the fish. I'm not too fond of blind casting fork.