i have commercial fished tuna in the pacific for 2 weeks on end. several trips throughout the summer.   out there you don't fuck around.  maybe a drink at the end of the day, but you don't get out of control, and certainly not high on drugs.  i drank beers with a captain of a tuna boat addicted to crack and heroin and he was clean for the time he was on the ocean and when he got back he would blow it all away again. its sad, but thats fishermen for you.  spend it as quickly as they get it.  if i was a deckhand and the captain was getting high, i'd get off the boat after the first trip.