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Also known as bluefin trevally, the blue jack, Caranx melampygus, has the ability to turn nearly black in an instant. This is likely evolved to enhance their proficiency as hunters of the reef. Hawaii.&#xA;<br />
Also known as bluefin trevally, the blue jack, Caranx melampygus, has the ability to turn nearly black in an instant. This is likely evolved to enhance their proficiency as hunters of the reef. Hawaii.&#xA;

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