Fig. 1
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The northern Gulf of Bothnia, covering ICES rectangles 1–16 (between latitudes 66°N and 64°N), and the southern Gulf of Bothnia, covering ICES rectangles 17–47 (between latitudes 64°N and 60°30'N). The whitefish (Coregonus lavaretus) samples were collected in the indicated rectangles in 1998–2014. Rivers: 1 = Tornionjoki, 2 = Oulujoki, 3 = Kalajoki. Sea surface temperature measurement site: Valassaaret station.
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