Welder. Especially an ASME code certified welder. We pay our top welder $50/hr; he also supervises other welders, though. However, the guys will often work 6 or 7 days a week for 10 hours a day because there’s never a shortage of things to weld. He makes more than anybody in the business including my dad who owns the business and employs him.
There is a shortage of good (legal) welders. It’s just about the most useful fabrication/construction skill one can have, though.
Fishermen frequently make six figures and only work part of the year. And Captains make more. But it is a job of youth. Few in their 50’s and 60;s can crew in that business. If they keep all their fingers and toes they might be a skipper in their later years.