Fishing

Hi Frank!
That's quite a difficult question to answer.

I am not so sure about license you need to fish but at least I can point you where to ask.

I think the best is to ask a local person, you can send a message to one of this guide and they are local experts so they will know exactly how to answer you: https://triplelights.com/japan/gifu/guides

you can also take a look at these pages:

Fishing center Mizube no Yakata: http://www.mazegawa.com/mizube/index.php

Hayashi Trout Farm Information of Fishing Park: http://www.hayashitrout.com/en/fishing.html

Fishing  Shokawa River, Shirakawago Hirase: http://www.hi-ho.ne.jp/amago/b-streams/shokawa2.html 

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Perhaps by contacting the pages above you can also get one answer. but maybe they can only speak Japanese. the guides will speak English so its a better option.