Atlantic salmon showing the kype (hook) in the lower jaw, a characteristic of the male during spawning season. The kype, which is reabsorbed at the end of the spawning season, is used in battle with rival mates. Credit: E. Peter Steenstra/USFWS
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This image was originally posted to Flickr by U. S. Fish and Wildlife Service - Northeast Region at https://flickr.com/photos/43322816@N08/5198590554. It was reviewed on 19 February 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.