Stardew heart eel is a valuable catch in the Stardew Valley game. This heart creature can be found in the creek during rainy days and at night. If you manage to hook a Cosmic heart fish, you can sell it for a good price. In addition to its worth, it is also highly sought after by fishermen for its exquisite appearance. So, grab your tackle box and head to the streamside to try your luck at capturing this Cosmic heart fish. Happy fishing!