|Scientific Name:||Oncorhynchus nerka (NASS RIVER: Upper Nass)|
|Species Authority:||Walbaum, 1792| |Taxonomic Notes:||A total
of 93 extant and five extinct subpopulations were identified
across the natural range of O. nerka. The assessors used a
combination of ecoregional information (i.e., based on
differences in marine and freshwater habitat) and the degree of
genetic divergence between known spawning locations, using an
Fst value of 0.04, representing a threshold level of gene flow
between putative subpopulations of less than or equal to one
effective migrant per year. The five extinct subpopulations were
based on Gustafson et al. 2007. While the assessors acknowledge
that it is not straightforward to ascribe demographic or
geographic distinctness to a subpopulation based on observed
genetic distances, they feel it is the most appropriate
methodology given the scale of the assessment and the paucity of
observations of stray rates among the spawning locations
considered in this assessment. For the amendmen