Female sexual maturity
Female gonad size was significantly associated with chromosome 01 and none of the other three adaptive regions in the WFA♀ collection (Table 1, Fig. 2). This finding is concordant with Parker et al. (2019) who also resolved a significant association between female gonad size and chromosome 01. The average gonad sizes associated with genotypes at candidate SNP Etr_464 (chromosome 01) were 25 g, 20g, and 18g for the AA, AC, and CC genotypes, respectively (Fig. 3a). While gonad mass was less in the Klamath River collection, categorizations by genotype were consistent (average egg mass of 13 g, 7 g, and 6 g for the AA, AC, and CC genotypes at Etr_464, respectively; Parker et al. 2019).