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The fur-bearing trout (or furry trout) is a legendary creature found in American folklore and Icelandic folklore. According to folklore, the trout has created a thick coat of fur to maintain its body heat. Tales of furry fish date to the 17th-century and later the "shaggy trout" of Iceland. The earliest known American publication dates from a 1929 Montana Wildlife magazine article by J.H. Hicken. A taxidermy furry trout produced by Ross C. Jobe is a specimen at the Royal Museum of Scotland; it is a trout with white rabbit fur "ingeniously" attached.
There are no known examples of any fur-bearing trout species, but two examples of hair-like growths on fish are known. The "cotton mold", Saprolegnia, can infect fish, which can result in the appearance of fish covered in the white "fur". Another fish, Mirapinna esau, has hairlike outgrowth and sports wing-like pectoral fins.