The Adriatic Sea is home to sharks, and more of them than most beachgoers realize. At least 30 shark species have been recorded in Croatian waters alone, and the full count across the basin is higher still. The roster includes blue sharks, sandbar sharks, and even the occasional great white. Yet the risk these animals pose to swimmers and divers is vanishingly small, and the far more pressing story is what humans have done to shark populations, not the other way around.
How Many Species Call the Adriatic Home
A systematic review of historical records, published literature, and citizen-science sightings in Croatia identified 54 species of cartilaginous fish, 30 of which are sharks. That accounts for roughly two-thirds of all cartilaginous fish species known from the entire Mediterranean Sea.1PubMed Central. Updated Checklist of Chondrichthyan Species in Croatia (Central Mediterranean Sea) Croatia covers only the central-eastern portion of the Adriatic, so the basin-wide tally, factoring in Italian, Montenegrin, and Albanian waters, runs even higher.
These species span an enormous range of sizes and lifestyles. Some are tiny bottom-dwellers that would fit in a kitchen colander. Others are open-ocean predators capable of crossing the entire Mediterranean. Understanding which ones actually frequent Adriatic waters, and where, is the first step toward sorting real danger from irrational fear.
Great White Sharks in the Adriatic
Great whites live in the Adriatic. That fact surprises many visitors, but the species has been documented there for centuries. What’s changed is how rare sightings have become. A study published in 2025 documented two recent records of very young great whites, one caught off Croatia in 2018 and another off Montenegro in 2025, noting that the broader Mediterranean population has experienced a marked decline over recent decades.2ACTA ICHTHYOLOGICA ET PISCATORIA. Recent observations of two young-of-the-year great white sharks, Carcharodon carcharias (Elasmobranchii, Lamniformes, Lamnidae), in the Eastern Adriatic Sea
The interesting detail is that both of those sharks were newborns, technically called young-of-the-year. Researchers have long suspected the Adriatic serves as a nursery area for white sharks, partly because juvenile specimens have turned up there disproportionately often compared with adults. The recovery of a very young specimen with features consistent with recent birth supports the idea that parturition may occur in Adriatic waters, a hypothesis further bolstered by a historical record of a pregnant female caught near Rijeka.3PubMed Central. New Evidence for the Contemporary Presence of Juvenile White Sharks (Carcharodon carcharias) in the Adriatic Sea If confirmed, this would mean the Mediterranean white shark population uses a more complex network of habitats than scientists previously understood.
Before anyone cancels a beach holiday over this: the very fact that researchers celebrate individual sightings tells you how scarce these animals are. Modern encounters are measured in single digits per decade.
When Governments Paid People to Kill Sharks
The anxiety around great whites in the Adriatic is nothing new. Between 1872 and 1909, the Austro-Hungarian government ran a formal bounty program for the capture of white sharks in the Kvarner Gulf along the eastern Adriatic coast. The reward was proportional to the size of the captured shark, and collecting the payment required bringing the animal to the local maritime authority, opening its belly, and checking for human remains.4PLOS ONE. From sea monsters to charismatic megafauna: Changes in perception and use of large marine animals White sharks were frequently seen or captured in traditional tuna traps in that area during the period.
That gruesome protocol hints at a time when encounters were far more common, when tuna trap fisheries drew large predators close to shore and humans had fewer tools to avoid them. It also illustrates how radically perceptions of sharks have shifted. A species that was once treated as vermin to be eradicated is now critically endangered in the Mediterranean and protected by international agreements. The Adriatic’s shark “problem” of the 19th century has given way to a conservation crisis.
Blue Sharks, Sandbar Sharks, and Other Large Species
The blue shark is the most commonly encountered large shark in Adriatic open waters. It’s a pelagic predator found throughout the world’s oceans, and the Adriatic population has been the subject of several recent studies. Research on 119 specimens from the Mediterranean examined how their body shape changes as they grow, with juveniles built more for quick maneuvering and adults shaped for the sustained swimming needed during long migrations and deep dives.5PubMed Central. Insights Into the Ecomorphology of the Blue Shark (Prionace glauca) in the Adriatic Sea (Central Mediterranean Sea) Blue sharks show up regularly in longline fishery catches across the southern Adriatic, where they constitute a significant fraction of bycatch. One study monitoring drifting longlines in the South Adriatic found that blue sharks made up about a quarter of the total catch.6Frontiers in Marine Science. Mitigating effects on target and by-catch species fished by drifting longlines using circle hooks in the South Adriatic Sea (Central Mediterranean)
Sandbar sharks are another noteworthy presence. Citizen science data and fishery records have revealed three hotspots for juvenile sandbar sharks in the northern Adriatic: the Emilia-Romagna coast, the Veneto region, and the Gulf of Trieste, all concentrated around the Po River delta.7PubMed Central. Using historical and citizen science data to improve knowledge about the occurrence of the elusive sandbar shark Carcharhinus plumbeus (Chondrichthyes – Carcharhinidae) in the Adriatic Sea Farther south, juvenile sandbar sharks have been recorded around the Bojana River delta near the Montenegro-Albania border, with most individuals measuring under about a meter in length.8PubMed Central. Observations of juvenile sandbar sharks Carcharhinus plumbeus (Nardo, 1827) around the Bojana River delta (Southern Adriatic Sea)
These river deltas appear to function as nursery areas. Modelling work identified the northwestern Adriatic coast as one of the most important nursery sites for early juvenile sandbar sharks in the entire Mediterranean during summer, which is the species’ main pupping season.9Journal of Applied Ecology. Too young to die: Mapping nursery areas for early juveniles of the endangered sandbar shark (Carcharhinus plumbeus) to inform conservation in the Mediterranean Sea Warm, shallow, nutrient-rich coastal waters near river mouths offer the right combination of food and cover for newborn sharks, which is exactly what river deltas provide.
The Small Sharks Fishers and Divers Actually See
If you spend time on the water in the Adriatic, the sharks you’re most likely to encounter are not the headline-grabbing ones. The lesser-spotted catshark is described as one of the most abundant shark species in the eastern Adriatic, a small bottom-dweller typically under about 70 centimeters that feeds on invertebrates and small fish along the seabed.10Acta Adriatica. Melanomacrophage centeres and diseases occurring in lesserspotted catsharks, Scyliorhinus canicula (L.), from the southern Adriatic Sea – importance for monitoring It poses no danger to people whatsoever.
Two other common species on the continental shelf are the spiny dogfish and the blackspotted smoothhound. Research on their feeding habits in the north-central Adriatic found that the two species coexist by eating different things: the spiny dogfish favors small pelagic fish like anchovies and sardines, while the smoothhound specializes in crustaceans, often scavenging along the tracks left by bottom trawlers.11PubMed. Feeding ecology and trophic segregation of two sympatric mesopredatory sharks in the heavily exploited coastal ecosystem of the Adriatic Sea Neither species is considered dangerous to humans. The spiny dogfish does have venomous spines on its dorsal fins, which can cause a painful wound if you handle one carelessly, but it doesn’t attack people.
These smaller sharks are the workhorses of the Adriatic’s marine food web, occupying mid-level predator roles that help regulate populations of fish and invertebrates. They are also the species most vulnerable to fishing pressure, because they live on the continental shelf where trawling activity is heaviest.
Deep-Sea Species Most People Never Encounter
The Adriatic’s continental shelf drops off steeply toward its southern end, creating deep-water habitat along submarine canyons off Albania and Montenegro. This is where some of the Adriatic’s least-known sharks live. The little gulper shark, a deep-sea species classified as critically endangered, was long considered extremely rare in Adriatic waters. But surveys off Vlorë, Albania, in the summer of 2023 turned up 47 individuals at depths between 400 and 450 meters, with local fishers reporting that the species shows up consistently in their longline catches.12Mediterranean Marine Science. From rarity to reality: the hidden abundance of critically endangered deep-sea little gulper shark Centrophorus uyato in the southern Adriatic Sea The finding suggests that what looked like rarity may have been a lack of sampling effort in the right places.
In the same area and at similar depths, three specimens of the sharpnose sevengill shark were documented in 2023, another deep-sea species rarely reported from the Adriatic.13Aquatic Conservation: Marine and Freshwater Ecosystems. Exploring the elusive deep‐sea sharpnose sevengill shark (Heptranchias perlo) in the Adriatic Sea: Novel records, health assessments and conservation implications These animals live far from beaches, in cold, dark water hundreds of meters below the surface. They are relevant to the Adriatic’s biodiversity story, but utterly irrelevant to anyone’s swimming safety.
Are Adriatic Sharks Actually Dangerous to People
By any reasonable measure, the danger Adriatic sharks pose to swimmers, divers, and boaters is negligible. Verified, unprovoked shark attacks in the Adriatic are exceedingly rare in the modern era. The species most commonly present in waters where people swim and wade, catsharks, smoothhounds, and dogfish, are either too small or too disinterested in large prey to be a threat.
The species that could theoretically cause harm, great whites and blue sharks, are scarce and spend most of their time well away from beaches. Great whites in the Adriatic are now so rare that individual sightings become research publications. Blue sharks are open-water animals found far offshore, and while they have been implicated in bites on humans elsewhere in the world, such events are uncommon globally and essentially unheard of in the Adriatic. Sandbar sharks, despite being present in nursery areas near the coast, are not aggressive toward people.
The real risk calculus for anyone visiting the Adriatic coast is firmly in the “other dangers are orders of magnitude more likely” category. Sunburn, jellyfish stings, sea urchin spines underfoot, and rip currents are all concerns a beachgoer should address long before worrying about sharks. The Adriatic remains one of the safer seas in the world for recreational swimming.
Why Shark Numbers Have Dropped
The more important question about Adriatic sharks is not whether they might bite someone but whether they will survive. Research tracking elasmobranch landings in the northern Adriatic over decades found a pervasive, continuous decline across all categories, with skates and catsharks collapsing two to three decades ago. The evidence pointed strongly to overfishing as the primary driver: even as fishing fleet capacity shrank over time, shark catches continued to fall, suggesting populations had already been hammered past the point of recovery under ongoing pressure.14ICES Journal of Marine Science. The role of fisheries and the environment in driving the decline of elasmobranchs in the northern Adriatic Sea
Bycatch plays a major role. Sharks in the Adriatic are rarely targeted directly; instead, they get caught incidentally in gear set for swordfish, tuna, and other commercial species. A decade of monitoring the Italian Adriatic pelagic trawl fishery documented regular bycatch of smoothhounds, spiny dogfish, eagle rays, and pelagic stingrays, with most incidents concentrated in the northern basin.15PubMed Central. Elasmobranch bycatch in the Italian Adriatic pelagic trawl fishery In southern Adriatic longline fisheries targeting swordfish, blue sharks are the most frequent bycatch species, creating a conservation problem that researchers are actively trying to address through gear modifications and post-release survival studies.16Biological Conservation. Resilience in the line: insights on post-release survival from long-term monitoring and satellite tagging of blue sharks (Prionace glauca) in the Southern Adriatic Sea
Environmental changes add further stress. Analysis of hydroclimatic data alongside elasmobranch catch records showed that rising water temperatures correlated negatively with populations of both skates and catsharks in the northern Adriatic.17ICES Journal of Marine Science. The role of fisheries and the environment in driving the decline of elasmobranchs in the northern Adriatic Sea Warming seas may be compounding the damage already done by fishing, squeezing species between two pressures at once.
What Losing Sharks Means for the Adriatic Ecosystem
The collapse of shark populations in the Adriatic is not just a conservation story about charismatic animals. When you remove top predators from a marine food web, the consequences cascade downward. A Mediterranean-wide analysis of large predatory shark declines warned that the losses could disrupt top-down control of the ecosystem, potentially releasing mid-level consumers, smaller fish and invertebrates whose populations were previously kept in check, to multiply unchecked.18PubMed. Loss of large predatory sharks from the Mediterranean Sea
In practical terms, this can mean explosions in jellyfish populations, declines in commercially valuable fish species, and shifts in the overall structure of marine communities. The Adriatic, already one of the most heavily fished basins in the Mediterranean, is especially vulnerable to these kinds of trophic reorganizations. The irony is that the animals most people fear are also the ones whose disappearance could do the most damage to the ecosystem that supports Adriatic fisheries, tourism, and coastal economies. The research on spiny dogfish and smoothhound feeding ecology illustrates the point well: those mid-level predators regulate crustacean and small fish populations, and their own numbers were historically held in check by larger sharks now mostly gone.11PubMed. Feeding ecology and trophic segregation of two sympatric mesopredatory sharks in the heavily exploited coastal ecosystem of the Adriatic Sea Remove a link in that chain and the effects ripple outward in ways that are hard to predict and harder to reverse.
Efforts like nursery area mapping for sandbar sharks and post-release survival studies for blue sharks represent the current front line of Adriatic shark conservation. The question is whether the science can move fast enough to inform policy before populations cross thresholds from which they cannot recover.