When tracking the annual movement of white marlin along the US East Coast, what specific temperature gradient is key to successful year-round targeting?

Answer

The 75-degree Fahrenheit isotherm

Successful year-round targeting of migratory white marlin requires an angler to actively track the movement of the 75-degree Fahrenheit isotherm as it migrates both north and south along the coast. This specific temperature marker correlates closely with where the fish will concentrate as they follow optimal feeding conditions. In the spring, the isotherm pushes north, drawing the fish toward the southern US states; by summer, it favors the Mid-Atlantic canyons; and in the fall, the retreat southward dictates where the second feeding peak will occur along the Carolinas and subtropics.

When tracking the annual movement of white marlin along the US East Coast, what specific temperature gradient is key to successful year-round targeting?
locationhabitatfishrangeMarlin