Lucas the tarpon might have spent last summer feeding in Louisiana before someone catches him off the Florida Keys — and scientists finally have proof.
Researchers at the University of South Florida have discovered that Atlantic tarpon — the prized silver giants that draw anglers from around the world — rely on just three key fueling spots along the southeastern U.S. coastline. Using five years of tracking data and chemical clues hidden in fish tissues, the team identified these feeding grounds that keep tarpon moving across hundreds or even thousands of miles of ocean.
Lead researcher Lucas Griffin and his team analyzed tissue samples from 417 tarpon and tracked 85 others using underwater microphones, listening for signals pinging from tagged fish as they swam along the Gulf and Atlantic coasts.
The findings surprised them. Tarpon don't snack randomly wherever they roam. Instead, they funnel through three distinct "foraging landscapes": South Florida, the northern Gulf of Mexico, and the Mid-Atlantic coast. South Florida stood out as the only place where tarpon from different migration groups consistently cross paths — making it a critical hub for the entire species.
The data showed that tarpon often grab most of their meals far from where fishermen actually catch them. The average feeding zone sat about 300 kilometers (roughly 185 miles) from the capture location — meaning a tarpon hooked near Charleston, South Carolina, might have been gorging on fish and crabs near Louisiana just weeks earlier.
"These fish connect coastlines that look completely separate on a map," Griffin said. "The tarpon someone catches in the Keys might have spent the previous summer feeding in the northern Gulf. So fisheries across the Southeast depend on habitats hundreds of miles away — damage one place, and anglers feel it up and down the coast."
The research, published in the journal Movement Ecology, has implications beyond just knowing where big fish eat. Because tarpon depend on so few productive feeding zones, threats like coastal construction, pollution, or climate-driven habitat loss could ripple across the entire recreational fishery — affecting angling communities from Texas to North Carolina.
But Griffin sees this discovery as a tool for protection, not just concern. Pinpointing these hotspots gives fisheries managers a roadmap for safeguarding the places tarpon need most. Next, the team plans to figure out exactly what tarpon are eating in each region — whether it's menhaden, mullet, anchovies, or crabs — so those prey species can be managed with tarpon in mind.
For an ocean wanderer that travels alone across hundreds of miles of open water, knowing where it stops to refuel could make all the difference for the generations of anglers who hope to catch one.