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A young rainbow trout (Salmo irideus) with a "horn" (the achene of Bidens cernua) on its head

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By: Gudger, E. W. (Eugene Willis),

Publication info: New York City, The American Museum of Natural History, [1931]

Holding Institution: American Museum of Natural History Library

Subjects: 59.7,55S:12.93 Abnormalities Bidens cernua Fishes Hatchery fishes Head North Carolina Parasites Rainbow trout