Great white sharks do live in the Mediterranean Sea, and their presence there has been documented since the Middle Ages. But the population is a shadow of what it once was. Classified as critically endangered in the basin, Mediterranean great whites have declined by an estimated 52% to 96% depending on the sector, and their remaining numbers are thought to concentrate around just a few key areas. The result is a population that undeniably exists but is genuinely difficult to find.
A Long History in the Basin
The Mediterranean is not a place great whites wandered into recently. Historical records of the species in the basin stretch back centuries, with documented sightings accumulating steadily from the Middle Ages onward.1ResearchGate. Mediterranean Great White Sharks. A Comprehensive Study Including All Recorded Sightings Researchers have built what is now the largest mitochondrial DNA dataset for Mediterranean great whites using referenced historical jaws spanning the 19th and 20th centuries, which has helped trace how and when the species colonized the region.2Journal of Biogeography. Pliocene colonization of the Mediterranean by Great White Shark inferred from fossil records, historical jaws, phylogeographic and divergence time analyses Those genetic analyses point to a colonization event dating back millions of years, meaning Mediterranean great whites are not simply Atlantic strays drifting through the Strait of Gibraltar. They represent a population with deep roots in the basin.
Much of what we know about their historical range comes from catch records, trophy jaws preserved in private collections and museums, and fishery logbooks. These records paint a picture of a species that once ranged across much of the Mediterranean, from the western basin near the Balearic Islands and the coasts of southern France to the central Mediterranean around Sicily and Malta, and into the eastern reaches near Greece, Turkey, and the Levantine coast. That breadth of distribution has since contracted considerably.
How Far the Population Has Fallen
The decline has been steep. A comprehensive analysis of abundance and distribution trends found that the Mediterranean great white population likely underwent a complex trajectory: a historical increase followed by a sharp reduction of roughly 61% since the second half of the 20th century, with the range of estimates spanning 58% to 72%.3Fish and Fisheries. Abundance and distribution of the white shark in the Mediterranean Sea When broken down by sector, some areas have fared far worse. Individual Mediterranean sectors show overall declines ranging from about 52% on the lower end to as high as 96%, and the species has contracted in where it can reliably be found.3Fish and Fisheries. Abundance and distribution of the white shark in the Mediterranean Sea
The population size itself remains unknown. No one has a confident head count, and the scattered nature of sightings makes traditional census methods impractical. Researchers have instead relied on modeling sighting records dating back to 1860 to estimate population trajectories across the region.4Oceanography. Detecting Mediterranean White Sharks with Environmental DNA The species is now formally classified as critically endangered in the Mediterranean, the most severe conservation status before extinction in the wild.5ResearchGate. First report of a great white shark in the waters of the Port-Cros National Park (France, northwestern Mediterranean Sea)
The Sicilian Channel and Other Hotspots
The remaining great whites are thought to cluster around a handful of hotspots considered important for reproduction and foraging. The most prominent of these is the Sicilian Channel, the stretch of sea between Sicily and Tunisia. This area alone accounts for roughly 19% of all historical sightings in the entire Mediterranean, making it the single most important known area for the species in the basin.4Oceanography. Detecting Mediterranean White Sharks with Environmental DNA
The Strait of Sicily has long been suggested to function as a nursery and reproductive ground. A 2025 study analyzing rare underwater footage of a white shark in the strait added 18 new records to existing datasets for the area over the past decade, reinforcing its importance.6PubMed Central. Biological and ecological insights from a rare underwater footage of the white shark (Carcharodon carcharias) in the Mediterranean Sea The fact that juvenile and immature individuals turn up here with some regularity supports the nursery hypothesis. In November 2015, for instance, an immature male great white was caught as bycatch by a bottom trawler in the Strait of Sicily.7Acta Adriatica. A new record of a great white shark, Carcharodon carcharias (Chondrichthyes: Lamnidae) in the Strait of Sicily, Central Mediterranean Sea
Other areas where sightings have historically clustered include the Adriatic Sea, the Tyrrhenian Sea off Italy’s western coast, and pockets of the Aegean and eastern Mediterranean. But the density of records is much thinner outside the central Mediterranean, and some of these areas may no longer host the species in any meaningful way given the extent of the population contraction.
Why They Are So Difficult to Find
Even in places where great whites are known to occur, actually encountering one borders on impossible. A research project aimed at tagging and sampling Mediterranean great whites illustrates the challenge vividly. The team made four separate attempts between 2017 and 2022 at locations along the Italian coast, including near Lampedusa Island in the Sicilian Channel, off Rimini in the Adriatic, and off Civitavecchia in the Tyrrhenian Sea. Across those four campaigns, they logged 288 total hours of baiting activity and used over 1,000 kilograms of chum. They did not see a single white shark. In fact, they did not see any shark species at all during the baiting sessions.8Acta Adriatica. Attempts to locate and sample the white shark, Carcharodon carcharias (Lamniformes: Lamnidae), along the Italian coasts in the Mediterranean Sea
This is striking when you compare it to white shark research elsewhere. Off South Africa, Australia, or central California, researchers using similar baiting and chumming techniques can attract great whites within hours. The Mediterranean result suggests an extraordinarily low population density. It also means that the satellite tagging data available for populations in other oceans simply does not exist here. We know very little about where individual Mediterranean great whites travel, how deep they dive, or how they move between the basin’s known hotspots, because no one has successfully attached a tag to one in recent years.
Researchers have increasingly turned to environmental DNA, or eDNA, as an alternative detection tool. The idea is straightforward: animals shed DNA into the water through skin cells, mucus, and waste, and filtering water samples can pick up traces of a species without ever seeing it. A study aimed at detecting Mediterranean white sharks through eDNA sampled waters in known hotspot areas, working from the premise that even critically low population densities might leave a detectable genetic signature.4Oceanography. Detecting Mediterranean White Sharks with Environmental DNA This approach is still in relatively early stages for this species in this basin, but it offers one of the more promising paths for confirming where the remaining animals actually are.
What Is Driving the Decline
The Mediterranean is one of the most heavily fished seas in the world, and great whites suffer from that pressure even though no one is deliberately targeting them. Bycatch in commercial fishing gear, particularly trawl nets and longlines, is a persistent threat. The 2015 capture of an immature male by a bottom trawler in the Strait of Sicily is a textbook example: an accidental catch that removes a young animal from a population that cannot afford to lose one.7Acta Adriatica. A new record of a great white shark, Carcharodon carcharias (Chondrichthyes: Lamnidae) in the Strait of Sicily, Central Mediterranean Sea For a species with slow reproductive rates, late sexual maturity, and small litter sizes, every individual matters. Even occasional bycatch mortality can drag a small population toward collapse.
Beyond direct fishing mortality, the Mediterranean’s broader ecological changes play a role. Prey availability has shifted as fish stocks have been depleted. Coastal development has altered habitats. Pollution, including heavy metals and persistent organic pollutants that accumulate in apex predators, adds chronic physiological stress. And the Mediterranean is warming faster than the global ocean average, which could alter the thermal conditions the species depends on, particularly in nursery areas where juvenile survival is most sensitive to environmental conditions.
Legal protections exist on paper. Great whites are listed under the Barcelona Convention, the Bern Convention, and CITES Appendix II, and are protected by national laws in several Mediterranean countries. But enforcement across a sea bordered by more than 20 nations with varying regulatory capacity is another matter. The species remains functionally unmanaged in much of its range.
Shark Encounters in the Mediterranean
If you swim in the Mediterranean, your chances of encountering a great white are vanishingly small. Confirmed attacks by great whites in the basin are extremely rare, and the population is now so depleted that an encounter would be exceptional by any measure. The Mediterranean does host other shark species, and the rare interactions that do occur tend to involve different animals altogether.
A 2025 incident at Hadera Stream Park beach in Israel underscored how complicated shark-human encounters in the Mediterranean can be. On April 21, 2025, a swimmer was killed in what researchers described as the first documented fatal shark encounter at a Mediterranean aggregation site. The species involved were dusky sharks and potentially sandbar sharks, not great whites.9Ocean and Coastal Management. Fatal shark incident in the eastern Mediterranean Sea highlights urgent need for enhanced management measures The Hadera site is unusual because warm-water discharge from a nearby power plant attracts sharks to waters immediately adjacent to a public beach, creating a proximity that does not exist at most Mediterranean coastal locations.
Prior to that event, reports of shark aggression toward swimmers in the eastern Mediterranean had been rare and limited to non-lethal events, such as ramming of surface swimmers and attempts to seize speared fish. A handful of incidents at offshore fish farms involved sandbar sharks interacting with divers during cage-cleaning operations where discarded fish remains were present.9Ocean and Coastal Management. Fatal shark incident in the eastern Mediterranean Sea highlights urgent need for enhanced management measures Neither dusky sharks nor sandbar sharks had previously been associated with a confirmed fatality anywhere in the world. The Hadera case was a genuine first, and it had nothing to do with great whites.
The broader point is that the Mediterranean shark most people fear, the great white, is the one they are least likely to ever see. The species that do occasionally come into contact with swimmers, such as blue sharks, shortfin makos, and various requiem sharks, are far more common but still rarely involved in incidents with people.
How Media Coverage Shapes the Conversation
Every few years, a great white sighting in the Mediterranean makes international headlines. A blurry photograph off Mallorca, a fisherman’s video near Lampedusa, or a carcass washing ashore in Tunisia generates a wave of breathless coverage that gives the impression the animals are surging back. The reality is usually one sighting among a handful that might occur in any given year across the entire basin.
Research on public attitudes toward sharks in the Mediterranean has found that media coverage tends to villanize the animals, which contributes to a lopsided distribution of conservation attention. Threatened marine megafauna like sea turtles and marine mammals attract substantially more research funding and public sympathy than sharks do, despite many shark species being in worse shape.10Mediterranean Marine Science. Increased knowledge affects public attitude and perception towards elasmobranchs and support for conservation The same study found that increased knowledge about sharks improved public attitudes and support for conservation, suggesting the fear gap is partly an information gap.
For Mediterranean great whites specifically, the sensationalized framing cuts both ways. On one hand, dramatic coverage of sightings keeps the species in public consciousness, which can help when conservation groups lobby for protections. On the other hand, the “monster at the beach” framing makes it harder to build the kind of sustained, nuanced public support that a critically endangered population needs. A species teetering on the edge in a particular region needs monitoring programs, bycatch reduction, and habitat protections, not seasonal panic.
How Mediterranean Great Whites Relate to Atlantic Populations
One question that has occupied researchers for decades is whether Mediterranean great whites are an isolated population or part of a broader Atlantic gene pool. The genetic evidence from historical jaw specimens points toward a distinct Mediterranean lineage with deep evolutionary roots in the basin, suggesting the population has been largely self-sustaining rather than regularly replenished by immigrants from the Atlantic.2Journal of Biogeography. Pliocene colonization of the Mediterranean by Great White Shark inferred from fossil records, historical jaws, phylogeographic and divergence time analyses If that is the case, the conservation implications are serious. A population that cannot be restocked by wandering Atlantic animals is more vulnerable to local extinction. Every individual lost to bycatch or habitat degradation is harder to replace.
The Strait of Gibraltar is narrow and features strong currents, but it is not an impenetrable barrier. Some gene flow between the Atlantic and Mediterranean populations likely occurs, but the genetic data suggests it is not enough to treat the Mediterranean population as a simple extension of the eastern Atlantic one. The Mediterranean animals appear to be on their own trajectory, for better or worse.
What eDNA and New Technology Could Change
The fundamental obstacle to conserving Mediterranean great whites is that we know remarkably little about the living population. We cannot count them, we cannot track them, and until recently we could barely confirm where they still occur. Environmental DNA offers a path around this problem. By sampling water in suspected hotspots, researchers can detect the species without the logistically demanding and often fruitless work of baiting and waiting.4Oceanography. Detecting Mediterranean White Sharks with Environmental DNA
The technology has limitations. eDNA degrades quickly in warm water and can be carried by currents away from where the animal actually was, so a positive detection tells you a great white was somewhere in the general area recently, not exactly where it is right now. A negative result does not mean the species is absent, only that no DNA was captured in that sample. But across many samples taken systematically over time, patterns can emerge that traditional visual surveys would never produce. If eDNA monitoring were scaled up across the Mediterranean’s known and suspected hotspots, it could generate the first real picture of where the remaining animals spend their time, which seasons they use particular areas, and whether certain zones have been abandoned entirely.
Advances in underwater camera networks, acoustic monitoring, and even satellite imagery for detecting large marine animals near the surface could complement eDNA work. The 288 hours of failed baiting along the Italian coast demonstrate that conventional methods are inadequate for a species this rare in a sea this large.8Acta Adriatica. Attempts to locate and sample the white shark, Carcharodon carcharias (Lamniformes: Lamnidae), along the Italian coasts in the Mediterranean Sea The species will only be conserved if researchers can find it first, and the old toolkit is not up to the job.