Grayling is any of the many game fishes and freshwater food found in the genus Thymallus. They have big dorsal fins and tiny mouths and are found in the Northern Hemisphere. It is a freshwater salmonoid food for fish.
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what is the definition of grayling
any freshwater fish of the genus Thymallus, related to the trouts but having a longer and higher, brilliantly colored dorsal fin.
any of several grayish or brownish satyr butterflies.