This gathering of thousands of sharks puzzles scientists

The waters of Tasmania hold many secrets. At a depth of 213 feet (65 meters), thousands of sleeping sharks are resting on the seabed. This striking concentration of female sharks has researchers intrigued.

The University of Tasmania has observed this phenomenon for the second time, with a six-year gap. What are they doing here, so far from the waters where they lay eggs?


A spectacular video, filmed by an underwater robot, reveals this "living carpet" of Port Jackson sharks in Beagle Marine Park. These images, captured by Boxfish Robotics' craft, unveil a captivating scene, reminiscent of the first observation in 2018.

Port Jackson sharks, known for their unique ability to breathe without moving, rest here in tightly packed groups. During the day, these predators relax, before hunting cephalopods and crustaceans in the rocky seabeds at night.

This time, scientists spotted only females. Researchers have proposed hypotheses to explain this mysterious gathering. Could it be a stopover to feed before they migrate north to lay their eggs?

Data is being collected by the Institute for Marine and Antarctic Studies at the University of Tasmania (IMAS) to better understand these behaviors. The results will help refine conservation strategies and protect these critical habitats.


Beagle Marine Park, managed by Parks Australia, hosts a rich variety of marine life. In addition to sharks, it protects rocky reefs and vibrant sponge gardens that are vital for the wildlife that feeds there.

For park managers, this new information is invaluable. It will allow them to assess the effectiveness of existing protection measures and better understand the importance of this area for female Port Jackson sharks.

Scientists continue their investigation into this aquatic mystery. More studies will be necessary to shed light on the reasons for this all-female gathering and uncover the mysteries of this fascinating species.