This shows the simplest way to do those annoying grindquests which has fishing in them. This is the optimal way to fish as of right now.. They need to fix this eventually though.
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How to Do It (Method)
It's really simple.. As of right now you it's not useful to place your fishponds together. Even if you put 4 fishponds together it doesn't raise the catchrate %, or give you more fish even if you succeed to get fish from that huge pond.
The way to do it now is to separate the fishponds and make a huge field. That way you get a higher chance to get those fish towards your 100+ fish quests.
Make sure to do a zigzag pattern and you'll be fit to fight!