Figure 12a (top). Posterior part of the otolith of a 42 cm age 16+ Atlantic mackerel collected in August, showing a second summer check and a split twelfth annulus. Calcium overgrowth obscures annuli 3-5, 9, 10, and 13.

Figure 12b (bottom). Rostrum of same fish, showing weak, diffuse annuli.

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(File Modified May. 23 2011)