I got the opportunity to fish Japan (with a guide, since I was an ignorant gaijin).
It's gorgeous and everyone has lots of chill, but the fishing isn't really all that great. Even their super remote mountain streams are overfished, and the rural locals don't abide seasons or limits. What we would consider googans.
As a nonresident I was allowed to keep 1 trout of any species, and there were large swathes of river I wasn't even allowed to approach due to being habitat for some hyper-endangered salamander. But the locals would have weirs set up every 30 feet and on multiple occasions we'd pass some old lady coming down the trail with a string of 50+ 6" trout (properly licensed residents can keep 4 a day) and a gill net (trout can only be taken by pole and line legally).