Ocean Warming Shifts Shark Migration North

Scientists monitoring Atlantic sharks say record-high ocean surface temperatures are pushing some species into higher latitudes, changing where they are seen along busy coastlines. One example is Contender , a 1,650-pound great white shark that researchers have tracked moving from the U.S. coast to Nova Scotia, Canada, as of July 11.

Researchers described the movement as part of a broader northward range expansion among multiple shark species. They said the shift is linked to unusually warm surface waters and changes in where prey species are found, as animals seek cooler and more suitable conditions.

Tracking data points to a broader Atlantic pattern

According to researchers, the oceans are absorbing excess heat from the atmosphere, and that heat uptake has helped drive global ocean temperatures to record highs this year. As waters warm, sharks are increasingly turning up in places that were previously outside their typical ranges.

Scientists said bull sharks and tiger sharks are being observed farther north than usual, including in coastal areas near popular swimming beaches. They described these sightings as consistent with sharks following prey distributions that are also shifting with temperature.

Coastal safety and the reality of risk

Experts said the northward movement raises the likelihood of human-shark interactions in coastal zones, simply because sharks and people may overlap in more places and for longer periods. They noted that sightings have risen in some areas, including New York.

At the same time, specialists stressed that unprovoked attacks remain statistically uncommon. Data cited by experts show there were 65 incidents recorded globally in 2023, even as public attention has grown in regions reporting more frequent sightings.

What the shift signals for marine ecosystems

Researchers framed the current migration pattern as an indicator of wider changes in marine ecosystems. They said sharks are moving with prey species that are seeking cooler, more hospitable waters, which can reshape food webs and alter where apex predators are present.

Scientists also cautioned that while warming waters can enable northward expansion, extreme heat may eventually put some species at risk. They said this creates uncertainty about how long current migration trends will persist and how different shark populations will fare if temperatures continue to reach extremes.

For coastal communities, fisheries, and beach managers, researchers said the key development is not only that sharks are being detected in new places, but that these movements reflect underlying ocean conditions that are changing quickly and at large scale.