The edge · 600 ft · shelf break and canyons

Blue Marlin

Makaira nigricans. Prime water reaches Cape Hatteras in Southeast Atlantic right now (84°F at the surface). Fish it 33–249 ft down — that is where 85–77°F water sits off Cape Hatteras.

Blue Marlin identification illustration
LaneThe edge · 100 fa (600 ft)
Depth it holds656–9843 ft
Prime water77–86°F (workable 77–90°F)
Holds in the column33–328 ft down below the surface, over 656–9843 ft of water
Judged onsurface temperature (NASA MUR satellite)
Structurenone

The water column off Cape Hatteras

0 ft299 ft598 ft217 ft of workable water33–249 ft · 85–77°F

The strip is the water itself, coloured by temperature from the surface down to the 598 ft surveyed bottom at that spot — one band per RTOFS model level. The outlined stretch is where Blue Marlin's temperature band (77–90°F) and the depth it holds actually overlap. That thickness is the number that matters: it is how much water you can work, not just whether the spot is warm enough somewhere. One model cycle, not a weekly archive — this holds still while the surface map scrubs.

How it's fished

Large trolled lures over canyons, seamounts and the continental shelf edge.

Region by region — right now

RegionSeasonPrime waterTempFish it atMonths
Southeast Atlantic in season reaches Cape Hatteras 84°F 33–249 ft
J
F
M
A
M
Florida Keys in season reaches Islamorada 86°F 33–303 ft
J
F
M
A
M
J
Gulf of Mexico in season reaches Tampa 85°F 33–135 ft
J
F
M
A
M
J
"Fish it at" is where this species' temperature band and its holding depth overlap in the water column, from the RTOFS profile (13 levels, 0–300 m) — the depth to actually put a bait, not just the place. "Prime water" is the furthest sampled station on the 100-fathom lane whose surface temperature sits inside this species' band. It is water, not a sighting report.
Charted grounds on the 100-fathom lane
The Charleston Bump
Marathon (West) Hump