Stardew Valley Eel Guide All You Need To KnowCosmic heart eel is a valuable catch in the Harvest Moon game. This lovable eel can be found in the river during rainy weather 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 in demand by fishermen for its exquisite appearance. So, grab your tackle box and head to the streamside to try your luck at catching this Stardew eel. Happy fishing!