Cosmic heart aquatic animal is a valuable catch in the Stardew Valley game. This heart fish can be found in the river during stormy weather and at night. If you manage to hook a Stardew eel, you can sell it for a good price. In addition to its worth, it is also in demand by fishing enthusiasts for its ornate beauty. So, grab your fishing rod and head to the streamside to try your luck at hooking this Stardew eel. Happy fishing!