Kype and/or characteristics that could be of importance in inter- and intra-sexual evaluations of individual quality. The size of the kype is believed to determine male spawning frequency. The extinct sabertooth salmon, "Oncorhynchus rastrosus", was first named for its prominent premaxillary dentition. It possesses an enormous conical tooth on each premaxilla. There is no visible kype on the dentary, implying a different strategy for forming mate dominance. Kype A kype is a hook-like secondary sex characteristic which develops at the distal tip of the lower jaw in some male salmonids prior to the spawning season. The structure usually develops in the
Ostorhinchus doederleini the male is solitary while brooding. He may incubate several broods during one breeding season, which is a few months long, depending on location. One mass contains about 10,000 eggs. One brood is incubated for 5 to 17 days. The length of time depends on water temperature. A larger male will generally incubate more eggs at a time. Also, males' mouths get larger during the breeding season, expanding significantly. The lower jaw becomes more depressed in shape. The male quite often eats his eggs. In one study, 361 egg masses were brooded by males, and they had eaten 47 of