Keenleyside and Dupuis, 1988


Keenleyside, M.H.A and Dupuis, H.M.C. (1988) Courtship and spawning competition in pink salmon (Oncorhynchus gorbuscha ). Can. J. Zool., pp. 262-265

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Oncorhynchus gorbuscha Female Length at sexual maturity Mean standard length: 47.58, range 43.0-54.9 48.95 cm
Oncorhynchus gorbuscha Male Length at sexual maturity Mean standard length: 50.37, range 41.6-57.5 49.55 cm
Oncorhynchus gorbuscha Male Male sexual dimorphism At one extreme are the biggest males with greatly enlarged snout (Kype) and dorsal hump (hence the name "humpback" for this species). The kype with its large teeth is used to ram and bite other males; similar snout development and associated aggressive behaviour are found in other salmonids. The considerable dorsal hump development, however, is unique to pink salmon, and as the largest males are consitently closest to the female in the group of males associated with har at spawning, the greatly enlarged hump also contributes to dominance amon males. At the other extreme are the smallest males, who resemble females in size, shape, and colour. Absent
Oncorhynchus gorbuscha Spawning conditions Spawning season October-November ['October', 'November']
Oncorhynchus gorbuscha Spawning conditions Spawning temperature 6-12°C during the study 9.0 °C
Oncorhynchus gorbuscha Spawning conditions Mating system Ten or more males may jockey for position near a nest-digging female and dash together into the nest when she spawns. The number of males competing for access to a single female is typically greater than in other salmonids. No category