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Isotope values of two example River Simojoki salmon otoliths micro‐milled and analyzed for oxygen and carbon stable isotopes: (a) FISH 1 (wild origin) and (b) FISH 2 (hatchery‐reared). Open circles represent δ13C values and filled circles δ18O values. Isotope point values used in the salmon assignment to the probable locations in the Baltic Sea during their first (1SW) and second sea winter (2SW) and second sea summer (2SS) are indicated
