Resource rooms have a 50% chance of spawning bats and a 50% chance of having fishing spots.
To catch fish, a fishing rod is required, with cave worms as bait. Scavengers drop both of these items. In resource rooms with fishing spots, there are three fishing spots. One of these three spots contains a cave snake, which will damage the player (or take their fish). If a snake appears in the fishing spot, stop fishing and click elsewhere to avoid taking damage. While the spots are static, the spots containing plain fish and the cave snake change occasionally.