Cosmic heart fish is a valuable catch in the Stardew Valley game. This heart creature can be found in the creek during stormy weather and at night. If you manage to catch a Stardew eel, you can sell it for a handsome profit. In addition to its monetary value, it is also coveted by anglers for its captivating charm. So, grab your angler gear and head to the streamside to try your luck at hooking this Stardew eel. Happy fishing!