Kype
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A kype is a hook-like appendage that develops at the distal tip of the lower jaw in some male salmonids prior to the spawning season. The structure usually develops in the weeks prior to, and during,
The kype is the hook on the lower jaw which some salmonids develop before the breeding season.
A large male arctic char (Salvelinus alpinus) in spawning condition with a clearly visible kype
Sockeye salmon (Oncorhynchus nerka) Female (above) and male in mating condition. Note that the male has a kype, enlarged snout, humped back and deeper, more extensive colouration.
Oncorhynchus
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Oncorhynchus is a genus of ray-finned fish in the subfamily Salmoninae of the family Salmonidae, native to coldwater tributaries of the North Pacific basin. The genus contains sixteen extant species,
Kype
…absent or hardly visible in large nonanadromous males, Arctic char (Salvelinus alpinus) and lake trout (Salvelinus namaycush). In salmonids of the genus Oncorhynchus (meaning "hooked snout"), the upper jaw becomes more elongated than the lower thereby forming a "snout". In some species, the development of the "kype…
Fossil jaw of the extinct Oncorhynchus lacustris
Apache trout
Lahontan cutthroat trout image USFWS