I recently tried a little bit of UHC, and I was trying to get the achievement for catching fish, and I even made one of those fish farms, only to realize that you can't cast a fishing rod in UHC. If this is intentional, then I just want to know why we can't fish.
It is intentional unless c0w just forgot to revert it back to normal. It just adds more challenge the game so you can't just set up an AFK fishing farm and skip a couple days of work in a few hours.