Minecraft wiki entry for Axolotl_farming, associated text: Once you have the materials you need, find a warm ocean and create a large holding pen for your axolotls. You can do this on land next to the warm ocean, or simply cordon off a section of the ocean, or carve an inlet into a beach. Build the pen so that the walls are at least one block higher than the water level, to prevent the axolotls from escaping. You can put a ladder in the pen to allow you to get in and out.