Originally posted by LemonCakes:

Thanks for your help, both of you. I was afraid heavy bait was the answer. The serpent trophies are tough to get, but we want to display all the fish. Looks like we'll be heading into the water at night, in the rain, with hope and a harpoon lol.

pro tip when hunting serpents. Use a bow, and when you see a sliver of health left on a serpent. Jump off the boat as it approaches and shoot so you can get the drops before they fall to the depths of the ocean. It's better than harpooning and wasting your time dragging them to an island.