Application of Genetic Stock Identiﬁcation and Parentage-based Tagging in a Mixed-stock Recreational Chinook Salmon Fishery
Genetic methods can guide and improve the management of recreational mixed-stock ﬁsheries by informing stock-speciﬁc estimates of harvest. We applied genetic stock identiﬁcation and parentage-based tagging to a recreational Chinook Salmon Oncorhynchus tshawytscha ﬁshery in the Columbia River to illustrate the value of genetic analysis in management. We sampled landed catch in 2017 and 2018, assigned the ﬁsh to genetic reporting groups, explored temporal trends in harvest composition within and between seasons, and assessed the accuracy and precision of genetic methods against estimates from conventional tagging methodology. The genetic stock identiﬁcation and parentage-based tagging produced concordant stock assignments, and the harvest composition estimates were validated with independent data. High assignment rates, relative to expended sampling effort, and precise harvest composition estimates with adequate sample sizes demonstrate that both genetic methods can be complementary, effective tools in advancing harvest assessment and recreational ﬁsheries management. The success of genetic stock identiﬁcation and parentage-based tagging supports the expanded application of genetics to similar ﬁsheries, potentially alongside existing or emerging assessment methods, and guides future improvements in data collection and analysis.
Jensen, A.J., C.B. Schreck, J.E. Hess, S. Bohn, K.G. O’Malley, and J.T. Peterson. 2020. Application of genetic stock identiﬁcation and parentage-based tagging in a mixed-stock recreational Chinook Salmon fishery. North American Journal of Fisheries Management 41(1):130-141. Online at https://doi.org/10.1002/nafm.10542.