Roundscale spearfish
Encyclopedia
Roundscale spearfish is a Tetrapturus
Tetrapturus
Tetrapturus is a genus of marlins and spearfishes found in tropical and subtropical oceans throughout the world. Some are popular in big-game fishing.-Species:* Atlantic white marlin ....

 which lives in the Atlantic.
Many fish believed to be white marlins might have been roundscale spearfish, which bear a close resemblance to the white marlin.
A team of university and government scientists has confirmed the existence of the enigmatic billfish species closely resembling the heavily fished, overexploited white marlin.

That brings into doubt the future of the threatened white marlin, as recent population assessments might have been overestimated since the species is virtually indistinguishable from the previously unrecognized roundscale spearfish.
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