You need to find several objects. These are:
Bamboo. You can get this from Ms. Weeder.
Thread. You need to make this out of the vines.
Nails. They're in the box that washes up on the shore.
When you've gotten these things together, then you can make the fishing pole.
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you have to do the goals to unlock the wooden fish pole
You have to getbamboonailsthreadI hope this answered your question.
go to tidal pool use bamboo fishing pole to fish
I caught a marlin with a wooden fishing pole at N. volcano beach at third island
on the ship