Age, Growth, Maturity, and Fecundity of Yellowstone Lake Cutthroat Trout

摘要: Abstract Demographic data are sparse for Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri; YCT). Data YCT in the spawning run (spring; 29 years) of a Lake tributary or caught gill nets set (fall; 30 at established lake locations between 1977 and 2007 were examined. Female proportion runs averaged 0.61 but was 0.48 among gillnetted “prespawner” (i.e., mature fish whose excised gonads indicated would have spawned next year). Maturity proportion-total length (TL) relationships female male logistic-shaped similar their inflection points; maturity onset occurred 200–250 mm TL; ∼95% ≥ 400 TL ∼70% prespawners. Fecundity positively associated with TL. Accuracy scale-based ages affected by frequently overlooked scale annulus an inability to unequivocally identify single cohort on basis characteristics using associated, recognized ageing criteri...