Cosmic eel is a valuable catch in the Harvest Moon game. This heart eel can be found in the creek during rainy weather and at night. If you manage to catch a Stardew eel, you can sell it for a handsome profit. In addition to its worth, it is also highly sought after by fishing enthusiasts for its ornate beauty. So, grab your fishing rod and head to the creek side to try your luck at capturing this Cosmic heart fish. Happy fishing!