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They may be one of the smallest members of the tuna clan, but blackfin tuna are among the tastiest, too. Like albacore, blackfin is "white meat" tuna, with flesh that's far whiter than the red or pink meat found on bluefin or yellowfin.

But the question of the day is: What makes the white meat white? For some answers, we went to Glenda Kelley, biologist for the International Game Fish Association.