HILL ET AL.: ANALYSIS OF GROWTH ZONES IN PACIFIC BLUE MARLIN 



Figure 4. — Thin tranverse cross section oftlie 6th dorsal spine from a 52.4 kg male Pacific Makaira lugricans 

 as viewed by a binocular dissecting microscope at 63 x magnification with reflected light and a black back- 

 ground. F = focus. Arrow indicates area of multiple rings within a single gi-owth band increment. 



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