(a) General. (1) Otter trawlers whose owners are issued a summer flounder permit and that land or possess 100 lb (45.4 kg) or more of summer flounder from May 1 through October 31, or 200 lb (90.7 kg) or more of summer flounder from November 1 through April 30, per trip, must fish with nets that have a minimum mesh size of 5.5-inch (14.0- cm) diamond or 6.0-inch (15.2-cm) square mesh applied throughout the body, extension(s), and codend portion of the net.