A rare scene was recently recorded in the waters of San Antonio Bay, within the San Matías Gulf: a concentration of sharks exceeding the presence of more than a hundred specimens.
The images captured by a drone revealed the presence of these sharks moving in a coordinated manner beneath the sea surface. The footage was taken by audiovisual creator Maximiliano Facundo Cartes Salas, known for documenting landscapes and marine fauna of the Patagonian region.
From the air, the dark silhouettes of the animals formed a kind of moving constellation, allowing a clear view of the joint movement of numerous specimens.
Due to its magnitude, specialists consider that this type of record has a high scientific value for understanding the behavior of marine species that are little studied in the region.
An uncommon aggregation of sharks in Patagonian waters
The images show dozens of Sandbar sharks, also known as copper sharks, moving together in coastal waters.
Each of these animals can measure between 2.5 and 3 meters in length and reach an approximate weight of between 80 and 100 kilograms. The scene constitutes one of the largest documented concentrations for this species in the San Matías Gulf.
The phenomenon was analyzed by specialists from the CONDROS Group, dedicated to the study of cartilaginous fish in the Patagonian region. This scientific team is part of the Center for the Study of Marine Systems (CIMAS) and conducts research on sharks, rays, and the roosterfish on the coasts of Río Negro.
According to the researchers, records of this type are uncommon and allow for expanding knowledge about the dynamics of these species in the marine ecosystem.
New technologies that allow documenting natural phenomena
The analysis of the images was carried out by specialists such as marine biologist Florencia Fernández, a member of the scientific team studying cartilaginous fish in the region. The research group also includes Dr. Marina Coller and technician Matías Suárez.
The scientists learned about the record from the notice of colleagues conducting an aerial census of marine mammals in the area. From that contact, they were able to analyze the visual material and confirm the presence of an unusually large aggregation of sharks.
The use of drones and other aerial observation technologies is transforming the way marine ecosystems are studied. Thanks to these tools, researchers and observers can document natural events that previously went unnoticed.
The sandbar shark and its ecological importance
The Sandbar shark is a migratory species that tends to appear more frequently in the San Matías Gulf during the warmer months. In this marine region, at least 12 species of sharks, 19 species of rays, and a chimera known as roosterfish have been recorded, evidencing the great diversity of cartilaginous fish present in these waters.
However, the study of these animals is often complex due to their great mobility and the difficulty of recording their behavior in the open sea.
Specialists believe that this concentration could be linked to an important biological process, possibly related to reproduction or the use of the area as a feeding ground.
However, further research is needed to understand whether it is a seasonal event or a recurrent behavior in the region.
A natural phenomenon that poses challenges for conservation
The sandbar shark is currently classified as a vulnerable species from a conservation perspective.
Its biology makes it particularly sensitive to fishing pressure, as it grows slowly, reaches sexual maturity around 20 years of age, and has long reproductive cycles. Additionally, each female produces few offspring per litter, making it difficult to recover populations when affected by capture.
In some cases, this species is sought after by recreational fishermen due to its size, while industrial fishing can also incorporate it into commercial circuits.
For this reason, specialists recommend avoiding the dissemination of exact sighting locations and promoting responsible practices of interaction with marine fauna. Beyond its imposing size, the sandbar shark does not pose a danger to people, and there are no records of attacks in Argentina.
The episode recorded in San Antonio Bay once again highlights the biological richness of the Patagonian coasts, where natural phenomena still persist, capable of revealing new secrets about the functioning of marine ecosystems.
