Other relevant thread I found about fishing was this one
http://underrail.com/forums/index.php?topic=1584.15I'm not 100% sure if I've got the mechanics right but it seems like after 3-5 fishes being hooked on a rod set on a single square the square has a really low chance to have another fish hook. It'd be a really nice quality of life change for fishes hooking to a rod not being capped on a single square. When trying to catch rare fish it gets tedious to keep having to move rods to a different spot.
