Researchers use first-of-its-kind tracking sensors to study billfish

Blue marlin (one of the largest fish) and sailfish (one of the fastest fish) provide some of the most prized fights in the sportfishing world, making catching them with rod and reel one of those "once in a lifetime" experiences. Their distinctive elongated front-end bill gives them a built-in sword-like weapon for hunting, and thus the moniker "billfish".

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