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Understanding patterns of somatic growth within populations greatly contributes to fisheries stock assessment. Splitnose rockfish Sebastes diploproa was reported as having a striking pattern of latitudinal growth variability from studies conducted in the 1980s. We investigated variation in growth parameters of splitnose rockfish by latitude using recent data from the NOAA Fisheries Groundfish Survey (2003–2008), current ageing techniques, and advanced modeling and statistical methods to provide an updated understanding of growth along this species’ latitudinal range. Sex-specific age data were fit to a von Bertalanffy growth function incorporating ageing error, and growth parameters were estimated for 5 areas along the US west coast, specified based on biogeographic boundaries. Resampled values of each growth parameter were then fit to linear models, and Akaike’s information criterion (AIC) was used to …