After reading an earlier thread on the exact same topic, I've been fishing from my longship and enjoying it immensely. I set the ship in motion ever so slightly with a row or 2 then stand on the opposite end of whichever direction it is heading. I eat 3 stamina foods and have some medium stamina pots in my action bar. Cast as far as I can 24-27m. then reel it in through the school of fish till my line has between 9-12 m remaining. For those bigger fish I will simply drop it in after losing them with as little as 4m of line out. The fish that drop off my cast due to stamina loss tend to loiter near where they dropped and I almost always catch them on 4-7m of line. One quickly gets proficient enough to judge how little line is needed to catch the fish based on its size. I find the less line I have out, the more likely fish are to detect the bait and bite. In my experience if the fish are not biting with 15-20m of line out, by reeling it in to 5-9m they will close the distance and start hitting my bait. Fishing from my ship near rocks clear of fog in the Mistlands has been very productive, and that anglerfish stamina food is awesome. Fish'n'bread, Bloodpudding & Bread are my new go to foods for fishing.