Cosmic eel is a valuable catch in the Stardew Valley game. This lovable eel can be found in the stream during rainy weather and at night. If you manage to catch a Stardew eel, you can sell it for a good price. In addition to its price, it is also highly sought after by fishing enthusiasts 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!