Fighting sea creatures:
Video just for fun:
New Fishing loot:
Note: I was going to suggest making a mini-game during fishing like pulling the fighting rod to the right and left and reeling it in, but odds are wurm will make it confusing and make it difficult for newer people to get food. This suggestion is to bring more content to the game, not make anything necessary in the game more difficult. And as far as sea animals go, they arent necessary.
tldr; Make sea creatures nearly impossible to fight without harpoons. sea creatures fight boat, knock people off, hurt people. Making sea creatures more difficult to add a new, more useful equipment. Equipment is crude jewelry using to give some interesting active buffs. If you took the time to read everything, you are awesome.