I lived in North Carolinia in the 70s and did a lot of flounder gigging. As some one said after dark. The intake and discharge canal for Brunswick Nuclear power station is loaded summer flounder and was public property when I worked there. Since 911 I am not sure. The edges of the canal drop off pretty quick and the flounder come up to the edge off the drop off every night. 10 - 15 pounders were somewhat common.