Extended Data Fig. 2. Comparison of individual and population body sizes of northern pike.

Mean (± s.e.m.) body size of all northern pike sampled in the fall of each year (population, black circles; n = 442) for muscle MeHg concentration using a biopsy method was stable over time. Individual northern pike (grey triangles) captured in 2007 and again in at least one subsequent year (n = 16 fish with 1–9 individuals recaptured each year 2008–2015) were used to determine individual losses of lake spike MeHg during recovery (see Fig. 3). These individual fish, which were also captured prior to 2007, showed an increase in body size over time (linear regression: y = 17.43x−34470.0, R² = 0.55, F_1,51 = 61.1, P < 0.0001)

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