domestication fitness isotope migration population restoration reintroduction Salmo salar zoo MINECO IJCI‐2015‐23618 Asturias Regional Government GRUPIN‐2014‐093 INTERREG Marine Observatory of Asturias Research Group ARENA 3.4 Feeding and growth Regarding nitrogen isotopes (Table 3 ), indicators of trophic level, for wild individuals, the two‐way ANOVA did not reveal differences between rivers ( F = 1.84, p = .179), but highly significant difference among years ( F = 54, p ≪ 0.001), as expected from significant correlation between δ 15 N and age in the whole dataset ( r = .755, df = 122, p ≪ .001).
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