Crystal River is famous for its manatees, crystal-clear water, and freshwater springs. It’s not the kind of place you’d envision meeting a shark. But that’s exactly what sparked the Crystal River Bull Shark Project, an ambitious, first-of-its-kind research effort we’re proud to support.
Over the past year, researchers have captured, tagged, and safely released more than 50 bull sharks, most of them neonates (newborns) and juveniles. What they’ve discovered is remarkable: Crystal River and Kings Bay appear to serve as both a nursery and a warm-water refuge for these top predators.
Bull sharks are highly adaptable, capable of living in both salt and freshwater, but until now, there had been no formal documentation of them using a spring system as a long-term nursery. Thanks to data collected through shark tagging, acoustic tracking, citizen science, and environmental monitoring, we’re beginning to understand how and when they use these systems, laying the groundwork for further habitat protections.
And they’re not alone. Researchers observed these sharks sharing space with manatees, dolphins, snook, bass, red drum, and more. That overlap raises fascinating questions about food web dynamics, resource competition, and the role of springs in supporting biodiversity in a changing climate.
You might be wondering: is it safe to swim or fish in waters that we now know host bull sharks? The answer, backed by the data, is yes. Despite frequent proximity to human activity, there have been zero recorded attacks in the Crystal River system. In fact, these young sharks seem to avoid people, even when they’re just feet away.
Interestingly, the real concern is for the sharks themselves. Some are being accidentally caught in local fisheries, especially during winter ladyfish runs, and others show signs of repeated capture and stress-related skin damage. As more marine predators seek refuge in spring-fed systems, understanding how to reduce accidental capture and promote coexistence becomes even more important.
Beyond the science, this project is also creating hands-on learning opportunities for students, early-career researchers, and underrepresented groups in STEM through partnerships with organizations like Minorities in Shark Sciences.
With their first year complete, researchers are diving into deeper analysis, including genetic and dietary studies to uncover even more about the bull sharks’ origins, feeding habits, and long-term use of the springs. Future funding will support expanded tagging, thermal studies, and collaborative publications that place Florida’s springs at the center of the conversation about climate adaptation and coastal conservation.
Want to help us uncover more secrets of wild Florida? By purchasing a Protect Florida Springs plate, you’re making projects like this possible.
