'Ghost Fish' Revelation May Alter Marlin's Status

Marine biologists say they've discovered a kind of living ghost — a giant predatory fish with a sword-like bill and and a tail so blue it seems to glow. The roundscale spearfish was documented just twice in the last century. Experts blame the case of mistaken identity, at least in part, on the spearfish's resemblance to the white marlin.

And now, the reappearance of this "ghost fish" may force regulators to revise their estimates of how many marlin are swimming in the Atlantic — and reconsider pleas to give them greater protection.

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