2 min
Warming Waters, Wandering Sharks: Why Blacktip Sharks Are Moving North
As ocean temperatures continue to rise, researchers are seeing major changes in the migration patterns of blacktip sharks, and that could mean more encounters between sharks and humans along North America’s east coast. A recent CNN feature highlighted groundbreaking research led by Stephen Kajiura of Florida Atlantic University, whose team is tracking blacktip sharks using GPS tags and onboard cameras to better understand how warming waters are reshaping marine ecosystems. According to Kajiura, average winter water temperatures have risen by roughly 1°C over the past decade, causing blacktip sharks to shorten their traditional southern migration and remain farther north for longer periods. That shift is increasing shark activity near heavily populated beaches, including Florida’s New Smyrna Beach — often referred to as the “shark bite capital of the world” — and even farther north into areas like Long Island, where shark encounters have historically been rare. Stephen Kajiura is a Professor of Biological Sciences at FAU. He studies the sensory biology and behavior of sharks and their relatives as well as their seasonal migrations in southeast Florida. View his profile The research is helping scientists better predict when and where sharks are likely to gather near shorelines. Kajiura notes that blacktip sharks often hunt in the same shallow waters used by surfers and swimmers, where reflective movement from hands or feet can sometimes resemble bait fish. While shark bites remain uncommon, understanding migration behavior is becoming increasingly important for public safety, beach management, and climate research. Journalists covering climate change, marine biology, shark migration, or beach safety can connect with Stephen Kajiura to discuss how warming oceans are changing shark behavior and what coastal communities should expect in the years ahead.





