How to beat the How to Fish Tuna

Catching and killing the How to Fish Tuna can be tricky as, despite only being a miniboss, it's a particularly furious fish. The Tuna is massive, can bounce and leap very high, and hits like a truck, so you need to take care when fighting one, especially since the lure required to catch it is rather expensive too, so you don't want to waste them. But you need to kill a Tuna every time you want to fight the final boss of island 4, so it's good to know the best way to defeat one in How to Fish, wh