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"We already have footage of hunting behavior of sailfish and mahi mahi where we have seen even more pronounced and more variable color change than in the marlin," Burns says.

That scenario mirrors decade-old observations that other large predatory ocean fish—marlin and sailfish—also keep near the surface in areas where deeper water is depleted of oxygen.

Mayor Martínez, 54, has watched the synthetic-drug revolution transform her hometown, which once prided itself on being the “sailfish capital of the world.”

A large sailfish leapt from the water and gored an elderly Maryland woman last week during a fishing excursion off Florida’s eastern coast.

Stick around for a glimpse behind the camera as Rosenthal films sailfish hunting in the open ocean.