Coldwater fish are a type of fish that live in cold water, such as lakes and rivers. Two examples of coldwater fish are SMELT (5 letters) and smelts (6 letters). SMELT is a small, silvery fish found in cold, deep waters. It is often eaten as a delicacy. Smelts are a type of fish related to SMELT, but they are usually smaller and have a milder flavor. Both SMELT and smelts are popular among anglers for their taste and abundance.