Cosmic snakelike creature is a valuable catch in the Stardew Valley game. This heart eel can be found in the river during stormy days and at night. If you manage to catch a Cosmic heart fish, you can sell it for a good price. In addition to its monetary value, it is also coveted by fishing enthusiasts for its captivating charm. So, grab your fishing rod and head to the creek side to try your luck at catching this Cosmic heart fish. Happy fishing!