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corselet wide under D2 (10-15 scale rows)back: patch of dark lines starts behind D1 & pectoralAuxis rochei rochei, Bullet Mackerel2Ds well separated
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corselet narrow under D2 (1-5 scale rows)back: patch of lines begins under D1 & over pectoralAuxis thazard, Frigate Mackerel, Frigate Tuna2Ds well separated