The flounder usually will hold on the jetties or any other rock piles as well as on docks and piers and in drainages coming from the marshes. My favorite bait for flounder is live bull minnows. If our area gets a strong southern wind, the incoming tide will push baitfish up against the rocks along the jetties and sea walls. That’s where you’ll locate flounder. Early morning is your best bite for flounder, but you also can catch them at night. When the tide’s falling, you’ll find flounder in the ditches and the cuts coming out of the marshes.