Fig 3. Mean element:Ca profiles for otoliths of Pacific bluefin tuna.

(see Table 1 for fish collection details) collected from the eastern Pacific (EPO = blue, N = 10), western Pacific (WPO = red, N = 10), and south Pacific (SPO = green, N = 5) Ocean; solid lines represent mean values and shading depicts ± standard deviation across laser distance from core (0 μm) to edge; dashed vertical lines denote approximate annuli distances derived from [35].