Notes: Use on fishing spots that when you right click say 'harpoon'. It's used to catch tuna, swordfish, and shark. Popular spots to catch tuna and swordfish are Karamja, Catherby, and the Fishing Guild. Popular spots to catch shark include Catherby and the Fishing Guild. This item can be added to the toolbelt, allowing the use without it being in your inventory. Keep in mind that once an item has been added to the toolbelt, it can NOT be taken off.