Figure 12a (left). Whole embedded otolith rostrum of a 42 cm age 16+ Atlantic mackerel collected in August showing weak, diffuse annuli.

Figure 12b (right). Postrostrum showing a second summer check and a split twelfth annulus. Calcium overgrowth obscures annuli 3-5, 9, 10, and 13.

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(Modified Nov. 26 2004)