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Contingent composition of Northwest Atlantic mackerel age ≥ 2 adult samples across (a) age class for older (1998–2000) and recent (2011–2016) year-classes, and (b) size class (cm) for the recent year-class samples. Numbers in each bar plot indicate the sample size of northern and southern contingents, and unassigned fish (probability < 0.7) for each age and size class.
