Scientists at the University of South Florida have warned that 2026 will be the worst year on record for sargassum seaweed washing ashore in Florida, with satellite data showing unprecedented accumulations in the Gulf of Mexico and Atlantic waters. The forecast comes as pollution and climate change continue to fuel the growth of the floating algae, which has already caused millions of dollars in cleanup costs across Brevard County and other coastal areas. Beachgoers in Cape Canaveral and Cocoa Beach may face another summer of rotting seaweed that emits hydrogen sulfide gas, irritating eyes, noses, and throats.
Sargassum seaweed plays a vital role in marine ecosystems, serving as habitat for seahorses, nurseries for sea turtles, and shelter for juvenile fish. However, the same seaweed that supports biodiversity is causing headaches for tourism operators and residents. Last summer, 12 miles of Brevard's northern beaches were closed temporarily due to sargassum buildup, costing local businesses an estimated $2.3 million in lost revenue. The Florida Fish and Wildlife Conservation Commission says the problem is worsening as nutrient runoff from agricultural and urban areas in the Caribbean and Florida Keys feeds the seaweed's explosive growth.
A 2025 study by the University of Miami found that sargassum-related economic losses in Florida could reach $13.5 billion annually by 2030 if current trends continue. The research highlights the seaweed's dual impact: while it builds coastal dunes and nourishes beach vegetation when it washes ashore, its sheer volume is overwhelming infrastructure. In 2024, the state spent $18 million on sargassum removal, with counties like Brevard allocating $3.2 million for boat-mounted rakes and drone monitoring systems.
Local scientists say the situation is compounded by rising ocean temperatures, which increase sargassum's reproductive rate. Dr. Maria Lopez, a marine biologist at the University of Central Florida, notes that the seaweed's arrival in Brevard waters has shifted from seasonal to year-round in the past decade. Meanwhile, beachcombers warn that while sargassum clumps can hide treasures like sea beans, they also harbor stinging jellyfish larvae. With another record-breaking summer ahead, officials are urging residents to report sargassum accumulations through the Florida Fish and Wildlife website.