Kategorie: News
When Tropical Sharks Migrate North
In late July, brothers Nate and Nelson Rouette caught a young tiger shark off Falmouth, Massachusetts - a catch the experienced sport fishermen hadn’t expected. They had actually been hoping for the more common brown sharks. “I saw those horizontal stripes and knew right away: That’s a tiger shark,” Nate Rouette, who works as a social media manager for On The Water magazine, told the AP news agency. The brothers released the juvenile, which was about 1.50 meters long, shortly afterward.
Tiger sharks are among the largest predatory sharks - adult specimens can reach up to 4.6 meters in length and weigh over 600 kilograms. Their natural habitat consists of significantly warmer waters: the Caribbean, the Red Sea, the Gulf of Mexico, the coasts of Florida and Brazil, as well as tropical regions off the coasts of Australia, South Africa, Madagascar, India, and Southeast Asia. The fact that a juvenile appeared so far north off the coast of New England is anything but common.
John Chisholm, a marine biologist at the New England Aquarium in Boston, views the discovery as part of a broader trend: young tiger sharks have been sighted with increasing frequency in northern waters in recent years. Rising global ocean temperatures have made the Atlantic off New England increasingly attractive to these typically heat-loving animals.
This is consistent with a January 2026 NOAA study, which showed that ocean warming is causing tiger sharks to migrate earlier and farther north than before - with the result that they are also more exposed to fishing in those areas. Jon Dodd of the Atlantic Shark Institute has also been observing this trend for decades: “I’ve been doing this for 40 years - 20 or 15 years ago, you didn’t see them here. The fact that they’re now showing up more regularly is a bit concerning.”
Tiger sharks aren’t the only species increasingly venturing farther north: Great white sharks are also being sighted more frequently off Cape Cod, a trend researchers attribute in part to a larger seal population, as well as other marine life such as the black sculpin, which are also finding new habitats in warming waters.
For the Rouette brothers, the catch was certainly an exciting experience, but Nate Rouette also sees it as a sign of the times: “You’re definitely seeing more and more species that indicate exactly that” - referring to the ongoing warming of the oceans.
Further information:
https://fortune.com/.../climate-change-is-making-cape-cod-a-tiger-shark-habitat/
https://www.boston.com/news/.../tiger-shark-massachusetts-warming-waters/