Tiger shark caught off Massachusetts in sign of warming seas

Nate and Nelson Rouette caught a juvenile tiger shark off a Falmouth, Massachusetts beach in late July 2026, a rare event that scientists say signals warming ocean waters. Tiger sharks typically inhabit warm southern seas like the Caribbean; the five-foot shark, recognized by its horizontal stripes, is an anomaly in New England.

Adults can exceed 15 feet and 1,400 pounds and pose greater danger to humans than most sharks, though unprovoked fatal bites are rare. The Rouettes, experienced night anglers who usually target brown sharks, were shocked by the catch.

"Immediately I started yelling to my brother, 'It’s a tiger, it’s a tiger shark!'" said Nate Rouette, social media manager for On The Water magazine. They described the experience as a thrill before releasing the animal.

John Chisholm, an adjunct scientist at the New England Aquarium’s Anderson Cabot Center for Ocean Life in Boston, said juvenile tiger sharks have been spotted more often in northern waters in recent years. Rising sea temperatures have made the Atlantic Ocean off New England more hospitable, he said, and the region could be becoming a nursery. "Maybe they are coming up here because conditions are right. There’s food, there’s warm waters," Chisholm said.

The sighting fits a broader northward shift of marine species. Great white shark sightings have increased off Cape Cod, attributed partly to a growing seal population, and other animals like black sea bass are also moving north.

"People are definitely seeing more species that indicate that," Nate Rouette said.