Rare Mediterranean white shark sighting reveals species in critical decline

A team of divers working for the Healthy Seas Foundation captured something extraordinary in the depths of the Mediterranean this week: clear underwater footage of an adult white shark moving through its natural habitat. The video has spread rapidly online, presented by some as a historic first—the first-ever submersed recording of a great white in these waters. Marine scientists, however, are urging a different reading of the encounter. What the footage actually documents, they say, is not a sign of recovery but rather a glimpse of a species in severe decline, one so elusive and threatened that seeing it at all has become a remarkable stroke of luck.

White sharks have inhabited the Mediterranean basin for millions of years. They are not newcomers to these waters, nor are they invaders. What has changed is their abundance. Since the middle of the twentieth century, the Mediterranean population has contracted by more than sixty percent. Today, the species is classified as critically endangered in the region by the International Union for the Conservation of Nature. José Carlos Báez, a researcher at Spain's Institute of Oceanography, explains that the sighting occurred in the channel between Sicily and Tunisia—an area frequented by white sharks, particularly during certain seasons. The timing is not coincidental. Red tuna migrate into the Mediterranean to breed, and white sharks follow their primary food source. This seasonal pattern, documented in recent research, suggests that prey availability shapes where and when these animals appear.

What makes the underwater footage genuinely unusual is not the presence of the shark itself but the method of documentation. Scientists have long known white sharks inhabit the Mediterranean; they have compiled numerous sightings from boats and fishing vessels over decades. Direct observation beneath the surface, however, remains extraordinarily rare. Anabel Colmenero, a marine biologist at Spain's Institute of Marine Sciences, emphasizes this distinction. The shark's extreme evasiveness and preference for deep water make it difficult to study and even more difficult to encounter. At forty meters depth, where this individual was filmed, the animal was already in its preferred realm—far from the shallow coastal waters where humans typically swim.

The viral nature of the video has prompted some to suggest it signals a population rebound. Scientists are clear this is not the case. Historical records tell a different story. Photographs from Mallorca and Catalonia from earlier decades show white sharks that are no longer present. Accidental catches by fishing vessels, once more frequent, have become rare. The appearance of a single shark every five or six years, Colmenero notes, represents not abundance but survival. The species has also become geographically concentrated. The primary breeding and nursery grounds in the Mediterranean are now confined to the central basin, particularly near the Sicily-Tunisia strait. Along Spanish coasts, no breeding zones have been identified. In the western Mediterranean—including Catalonia, Valencia, and the Balearic Islands—sightings are sparse and typically involve isolated individuals in transit.

Since records began in 1862, researchers have documented sixty-six sightings or indirect evidence of white sharks in Spanish Mediterranean waters. In that same span, only two attacks on humans have occurred: one fatal incident in Málaga in 1862 and one serious injury to a surfer in Tarifa during the 1980s. Báez explains that white sharks rarely approach the coast because their physiology demands constant motion; if they stop swimming, they drown. Coming close to shore risks stranding—a danger equivalent, he suggests, to humans approaching an abyss. They venture toward shallow water only when pursuing specific prey, such as seals. The rarity of coastal encounters reflects not aggression but avoidance.

Scientists have found no evidence that climate change or thermal anomalies in seawater are driving changes in white shark behavior. Other species have shown climate-related shifts—whale sharks, for instance, have appeared in the Mediterranean only in recent years, and some ray species are reproducing earlier than their historical patterns, creating mismatches between breeding cycles and food availability. But for white sharks, the primary threat remains what it has been: the cumulative pressure of fishing, habitat loss, and the depletion of prey species. The video, remarkable as it is, documents not a recovery but a persistence. These animals are still here, still hunting, still following the ancient rhythms of migration. That we can see one at all, in an age when their numbers have contracted so severely, is less a sign of abundance than a reminder of how close they have come to vanishing entirely.