A large ocean fish with blue coloring on its back and fins, particularly the bluefin tuna which is a fast, powerful game fish.
From 'blue' plus 'fin,' a compound name describing fish with blue-colored fins or blue back coloring, especially the tuna family.
Bluefin tuna are absolutely remarkable fish—they're warm-blooded (unlike most fish), can swim at 40+ mph, cross entire oceans, and are worth thousands of dollars on the sushi market, making them targets of industrial overfishing.
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