Researchers say they have identified what appears to be the first documented seasonal mating site for tiger sharks. Based on six years of tracking data, the study focuses on waters off Olowalu on the island of Maui.
The findings, announced by a team of researchers from the University of Hawaii at Manoa’s Hawaii Institute of Marine Biology (HIMB) Shark Lab on January 15, 2026, reveal a predictable annual gathering of mature male and female tiger sharks. This challenges the long-held view that these creatures live alone and reproduce mainly through random encounters.
The scientists published their peer-reviewed findings in the journal Nature on December 18, 2025.
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Tiger shark mating linked to seasonal movement
Tiger sharks typically roam vast areas of the ocean, thus making their reproductive behavior difficult to study. However, long-term acoustic tracking devices reveal a consistent seasonal pattern around Maui, where mature sharks of both sexes arrive at the same time and location each year. Paige Wernli, lead author of the study and a graduate student in the HIMB Shark Lab, said:
Tiger sharks typically roam widely in what can seem like random patterns, so finding such a strong and consistent seasonal trend in their movements around Maui was unexpected. We were surprised to see that these sharks are so predictably present at one location and time of year.
Researchers found strong spatial and temporal overlaps between males and females at Olowalu, along with signs consistent with mating activity. Combined, these suggest an annual aggregation rather than a chance encounter. According to Carl Meyer, co-author of the study and principal investigator of the HIMB Shark Lab:
To our knowledge, no group mating site for tiger sharks has ever been identified. This paper adds an important piece to the puzzle of tiger shark reproduction.
Tiger shark mating season overlaps with whale season
Also, the timing of the sharks’ arrival coincides with Hawaii’s humpback whale calving season. That’s when mothers and newborn calves move into the nearshore waters around Maui. This could be another reason the sharks are present at the same time. The tiger sharks may take advantage of seasonal food sources, such as vulnerable whale calves and placental remains. Wernli explained:
Mating and foraging on humpback whales may not be mutually exclusive and both could influence tiger shark movement patterns in Hawaii.
Rather than forming tight groups, the sharks spread out over several miles and remain in the area for months. This indicates a loose but persistent aggregation. Meyer added:
This study expands our knowledge of tiger shark mating and challenges our conventional understanding of the term gathering. Together, the results suggest that both reproduction and food availability play key roles in shaping tiger shark movements in Hawaii.
Years of tracking reveal hidden patterns
The research team spent six years capturing tiger sharks, implanting acoustic transmitters and maintaining an extensive network of underwater listening stations across the Main Hawaiian Islands. Wernli said:
Tracking wild sharks in the open ocean is inherently challenging. Even with all that effort, wide-ranging sharks don’t always show obvious patterns, so a lot of patience and persistence is required to get meaningful results.
In the future, the team plans to deploy camera-equipped accelerometer tags to capture direct observations of mating behavior. It could also capture interactions between sharks and whales, offering new insight from the animals’ perspective.
Bottom line: For the first time, researchers have identified a tiger shark mating site. Their study reveals a predictable gathering pattern among the sharks off the island of Maui, indicating their mating is not random.
Via University of Hawaii at Manoa
Read more: Fledgling seabirds in Hawaii are easy prey for tiger sharks
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