“Wicked Tuna,’’ the hit reality series about commercial fishermen from Gloucester, is returning for a sixth season. The show follows Tyler McLaughlin, Nick “Fudge’’ Duffy, Dave Marciano (right), TJ Ott, Brad Krasowski, Paul Hebert, and Dave Carraro as they compete to pull in more fish than the other guys in the fleet. We’re told last season’s winner, Carraro, is confident that he and his crew can repeat their success. The first episode of season 6 will air March 12 on the National Geographic Channel.