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At a Tuna Club meeting some years ago, Dr. Guy Harvey shared some uncut video of blue marlin that he shot somewhere off the coast of South Africa. He and his crew, which included well-known Southern California photographer Bill Boyce, spent several weeks filming the underwater feeding behavior of blue marlin. In the video, once the boat slowed to an idle, the divers hit the water and the crew began casting a variety of teasers, as well as live and dead baits and retrieved them at different speeds. Instead of disappearing when the boat stopped, the blues actually teased up…