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The Business of Fear: When Truth Takes a Back Seat

Sharks, Jellyfish, Pufferfish and the Media Panic in Greek Seas!

In recent weeks, once again, we are witnessing a new wave of fearmongering about the Greek seas. Jellyfish, sharks, and pufferfish are being presented by some media outlets, self-proclaimed “experts,” YouTubers, and even scientists as a constant threat to swimmers. They are described as species that have just appeared, spreading, increasing, and various other inaccuracies. Οn the one hand they are linking them to unfounded dangers, and on the other these inaccuracies become widely believed when they come from self-proclaimed “experts”.

But reality is not as convenient for clicks and likes!

Jellyfish

Greek seas have not suddenly turned into dangerous waters. Jellyfish are a long-standing and natural component of Mediterranean marine ecosystems. Population outbreaks have been recorded for decades, with references dating back to the 1960s. The real question is not why jellyfish exist, but whether these phenomena are becoming more frequent or longer-lasting, and how they are linked to the climate crisis, overfishing, and pollution of our seas.

Instead of opening this discussion and taking action to collect the necessary long-term data, we choose to talk about nets on beaches and cultivate panic.

Sharks

A similar situation applies to sharks. Unsubstantiated maps and articles circulate that present supposed “shark hotspots” in Greece, creating false impressions and fear among the public. At the same time, populations of many shark and ray species in the Mediterranean have suffered dramatic declines in recent decades. Instead of discussing how to reverse this collapse and how to maintain healthy marine ecosystems, we reproduce fear-based narratives, controversial or poorly documented reports of old incidents, and scenarios that do not reflect today’s reality.

The distribution of these species is not determined by social media videos, which represent a drop in the ocean compared to the sharks that are caught and landed daily in fishing ports and fish markets across the country without ever going viral.

Even with the rapid circulation of shark videos, the truth is that human–shark interactions in Greek waters remain extremely rare and significantly fewer than in the past, according to a scientific publication from the University of Patras. Today, however, every animal sighting is recorded, reproduced, and amplified through social media and the constant news cycle.

Pufferfish

And now we are facing yet another moral panic: the pufferfish.

The first confirmed records of pufferfish in Greek waters date back to 2005, and they have now spread throughout the entire territory. While in previous years the discussion focused on whether their consumption is dangerous and their toxicity was emphasized to prevent fatalities, this year it is their bites that are being portrayed as a threat to humans!

Despite dramatic headlines, there is no documented evidence supporting unprovoked attacks to swimmers. On the contrary, there are videos of people, even with kids, petting and playing with pufferfish. Such incidents that may have resulted in bites (by the pufferfish) cannot be characterized as attacks, but rather as disturbance of wildlife.

Instead of seriously discussing the expansion of invasive species, their impacts on ecosystems, and the need for a coordinated national management strategy, public discourse once again is reduced to shouting, oversimplification, and communication fireworks.

The solutions are known

The solutions are known and require scientific documentation, long-term planning, and political will. We need healthy marine ecosystems, protection of biodiversity, recovery of predators, and restoration of the natural balance mechanisms of ecosystems. We need to reduce the pressures we pose on the seas every day.

Ecosystems have mechanisms of adaptation and balance. Humans, on the other hand, are often the main pressing factor. And as long as we refuse to acknowledge this, we will continue to treat symptoms rather than causes.

In Greece and the Mediterranean there are organisations, researchers, and institutions that have been working for years towards this direction. These efforts rarely make headlines in a way that properly informs citizens. Instead, fear-based images are promoted, which certainly lead to clicks, views, and publicity.

Journalists and media outlets bear responsibility. Experts also bear responsibility to speak publicly with calmness, accuracy, and only on issues in which they do have genuine expertise. The same applies to those who present themselves as experts on social media and online platforms. As an environmental organisation working for the protection of the sea, we feel obliged to state clearly:

Fearmongering and click baits do not protect citizens. It does not protect biodiversity. It does not protect the sea.

On the contrary, they distract public debate from the real problems: the climate crisis, pollution, overfishing, biodiversity loss, and the need for meaningful management of marine ecosystems.

We are therefore launching a series of interviews with scientists and environmental professionals, so that specialized and well-documented voices working systematically on these issues can be heard. Our aim is to provide responsible information while also giving access to reliable sources of knowledge.

Alexios Ramfos

Jellyfish

Periklis Kleitou

Pufferfish

Ioannis Giovos

Sharks

Dimitris Moutopoulos

Sharks

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Alexios Ramfos

Alexios Ramfos

Is the appearance and increased number of jellyfish observed this year in Greek seas and in specific areas a strange phenomenon?

We cannot talk about an increased number of jellyfish or increased frequency of jellyfish appearances based on the existing recording system (platforms that rely on citizen observations). These data can be useful, under certain conditions, but they are indicative and cannot, on their own, be used as a basis for drawing such conclusions.

Jellyfish population blooms exist, but there is not yet sufficient scientific knowledge or models to reliably predict them (especially in Greece, where we do not even have a single scientific publication concerning populations of the mauve stinger jellyfish (Pelagia noctiluca) in Greek waters!). Therefore, we can generally refer to some possible causes (warming of waters, overfishing, reduction of their predators, etc.), but the reality is that we do not know where and with what intensity a future increase in their populations may occur.

Has the population of different jellyfish species increased in recent years? If so, what could be the reason?

We do not know, because we do not have reliable data (records, oceanographic studies, scientific publications, etc.) for the Greek seas. The information comes in a fragmented way, mainly through the iNaturalist platform (Citizen Science), and the use of these data must be done after proper processing in order to draw any valid conclusions that can be derived from these records. In order to begin drawing conclusions, the state must invest in systematic and long-term monitoring of the pelagic and coastal areas of the country.

Is there any real reason for concern due to their presence?

In cases where significant population outbreaks occur (e.g. the Corinthian Gulf in 2015–16), swimming should be avoided or done with caution. There is no other reason for concern beyond personal safety. There are areas where the seasonal presence of jellyfish species appears to be systematic (e.g. in the Ambracian Gulf for the species Aurelia aurita or in the Katakolo area for the species Rhizostoma pulmo), but again there are no studies on the causes of their presence, their populations, or measures to protect swimmers.

Title: Assistant Professor, Department of Biology, University of Patras

Contact details: aramfos@upatras.gr, +30 2610 969262

Periklis Kleitou

Periklis Kleitou

When did pufferfish appear in the Mediterranean Sea?

When we say “pufferfish,” we are not referring to a single species, but to species of the family Tetraodontidae. These are toxic species that accumulate tetrodotoxin, a very powerful neurotoxin that is not neutralized by cooking and is fatal if consumed.

In shallow waters, the species most commonly seen by divers, spearfishers, and other sea users is the orange-spotted pufferfish Torquigener hypselogeneion. This species has been recorded in the Mediterranean since 1987, initially from the Haifa Bay, and in recent years it appears to have become much more frequently observed in several areas of the eastern Mediterranean, including Greece.

The larger and more “problematic” pufferfish is Lagocephalus sceleratus. This is the species most associated with damage to fishing nets, longlines, and catches. Its first confirmed record in the Mediterranean was in 2003, in the Gökova Bay in southwestern Turkey, and it is considered a species that entered from the Red Sea through the Suez Canal. There are also other related species, such as Lagocephalus suezensis, which was recorded earlier, in 1977, but for the general public the two most commonly discussed species are Lagocephalus sceleratus and Torquigener hypselogeneion.

Is there an increase in their population in the Mediterranean? If so, since when and why?

Yes, there is an increase, but it is not a phenomenon that appeared suddenly this year or last year. For the orange-spotted pufferfish, its presence has been known since 1987, but its spread and the frequency of observations have become more evident in recent years in parts of the eastern Mediterranean. For Lagocephalus sceleratus, the increase has been particularly pronounced since its first record in 2003. Within a few years it became established, spread widely, and is now considered a very common species in several parts of the Mediterranean.

The reasons are multiple and act in combination. The Suez Canal remains the main corridor for species entering from the Red Sea, while the warming of the Mediterranean creates more suitable conditions for warm-water species. These fish are also highly adaptable: they feed on a variety of organisms, reproduce efficiently, and have few natural predators due to their toxicity. They are also not effectively controlled by fisheries or markets because they are unsafe for human consumption. For this reason, their presence in fisheries is disproportionately impactful: while they have no commercial value as food, they cause significant damage to fishing gear and catches.

There is a clear need for systematic monitoring, so that reliable data can be collected over time and space. Only then can we properly assess population fluctuations and understand whether they are driven by natural factors, human activities, or a combination of both.

Do Marine Protected Areas help reduce their impacts, and what other measures could contribute?

Marine Protected Areas (MPAs) can help, but mainly indirectly. A truly healthy, well-managed, and effectively enforced MPA can reduce local pressures, such as overfishing and habitat degradation, thereby increasing ecosystem resilience. In general, a more balanced and functioning ecosystem with stable food webs is naturally more resistant to pressures, such as invasive species.

The problem is that many protected areas in the Mediterranean and Europe remain “protected on paper,” with limited enforcement of meaningful measures. In some cases, poorly managed MPAs can even facilitate invasive species. This has been shown in scientific studies on lionfish, where areas with fishing restrictions can end up hosting higher densities of invasive species if no targeted control measures are in place.

For managing pufferfish and other invasive species, an integrated ecosystem-based approach is needed. This includes systematic monitoring combined with targeted removal actions, incentives for fishers, reporting systems, public awareness, and support for fishers affected by gear damage.

For pufferfish in particular, experimental and industrial research is exploring strictly controlled thermal processing methods to deactivate the toxin, with the aim of producing non-food products, such as fishmeal for aquaculture feed. However, this is still at an early stage and requires further safety evaluation, regulatory frameworks, and assessment of economic viability before it can be considered broadly applicable.

Are injuries to swimmers from pufferfish common, and if so, how do they occur?

Injuries to swimmers from pufferfish are not common. This is important to state clearly, because despite their increasing abundance in parts of the eastern Mediterranean, there is no corresponding pattern of frequent injuries to swimmers. The main and very serious risk to humans remains consumption, due to their high toxicity.

This does not mean bites are harmless. Pufferfish have strong beaks and can cause serious injuries if they bite. However, documented incidents are rare and usually occur under specific circumstances. For example, when someone tries to handle or catch the fish, or places fingers near its mouth. The most accurate description is that bites are rare but can be serious, and they are usually associated with provoked or exploratory behavior under particular conditions.

The message to the public should remain calm and practical: do not touch pufferfish, do not feed them, do not attempt to catch them with bare hands, do not place fingers near their mouths, and never consume them. There is no need for panic among swimmers, but there is a need for awareness and common sense. The same applies to all wild animals.

Title: PhD in Marine Sciences, Researcher at Marine and Environmental Research – MER Lab

Contact details: pkleitou@merresearch.com

Ioannis Giovos

Ioannis Giovos

Have sharks actually increased in Greek seas?

Based on the available scientific evidence, there is no indication that shark populations in Greece have increased in recent years. On the contrary, the most recent data clearly show a significant decline in shark and ray populations over the last 50 years, as reflected in the updated Greek Red List assessments. You can find more information here: https://redlist.necca.gov.gr/en/home-copy/ and here: https://isea.com.gr/red-alert-for-sharks-and-rays-in-greece/

The recent rise in reported sightings is mainly due to major improvements in how information is recorded and shared, through mobile phones, drones, and social media. As a result, incidents that in the past would have been known only to local fishers or residents can now become nationwide within few hours. Our organisation, iSea, has documented nearshore shark sightings over the past 10 years, while a recent University of Patras study shows that such occurrences were already common before 1960. You can find the study here: https://www.mdpi.com/2076-2615/12/24/3575

In addition, all shark species currently observed are long-established residents of Greek waters, with a presence spanning hundreds of years (for example, the Blue shark was already described by Aristotle). At the same time, some species that were historically recorded are now extremely rare or may have disappeared from Greek seas.

Why are sharks seen near the coast?

Recent appearances of Blue sharks in the Corinthian and Saronic Gulfs have again been presented as something unprecedented. However, Blue sharks are natural inhabitants of the Mediterranean and Greek waters, so their presence near the coast is not necessarily unusual.

Possible reasons include reproduction, feeding behavior, movement of prey species, or local environmental conditions. Despite frequent references to climate change, there is currently no scientific publication that directly links recent coastal sightings to rising sea temperatures. The species being observed are long-known, regular inhabitants of Greek seas.

According to a University of Patras study, media records of shark sightings, including coastal ones, increased gradually until 1969. After that, reports declined significantly, while large sharks appear more frequently in older records and then show a gradual decrease.

Are the most “famous” shark species actually the most common in Greece?

Most recent media-reported incidents involve Blue sharks. There are also some records of Thresher sharks in more offshore waters.

However, in public discourse, the term “shark” is often used without species identification, creating the false impression that all sharks are the same. Proper species identification is essential for scientific assessment.

It is also important to note that many widely circulated maps or narratives do not reflect reality. Every day, large numbers of sharks and rays are landed in Greek fish markets, yet these are rarely represented in public sightings. For example, a systematic study in the North Aegean showed that approximately 543 tons of sharks and rays were landed within just one year across four fish markets and ports. You can find the study here: https://www.sciencedirect.com/science/article/abs/pii/S096456912100226X

Therefore, commonly shared sighting maps represent only a very small fraction of reality and can lead to misleading conclusions when presented without scientific context.

What is the most important factor affecting sharks?

Although climate change may influence the distribution of some species, bycatch is by far the most significant and best-documented threat to sharks and rays in the Mediterranean. Fishing-related mortality remains the primary driver of population declines.

At the same time, coastal development, habitat degradation, and marine pollution are also important threats, though in some cases even more significant than bycatch. However, data gaps remain substantial, making it difficult to quantify their exact impact.

Regarding rising sea temperatures, there is currently no evidence linking recent shark sightings in Greek coastal waters to climate change.

How does fishing affect sharks in Greece?

Bycatch is the leading cause of mortality for many shark and ray species in Greece. Evidence shows that protected species are still being caught and, in some cases, entering markets and food supply chains (more information: https://www.sciencedirect.com/science/article/abs/pii/S0308597X19302027 and https://isea.com.gr/sharks-on-our-plate-how-greeks-end-up-eating-mislabelled-protected-species-of-sharks-and-rays/ )

Mislabeling and poor traceability further complicate enforcement and conservation efforts. Monitoring of landings indicates that fishing pressure remains the most significant threat to many species in Greek waters.

How well do we understand sharks in Greece today?

Despite increased public attention, significant knowledge gaps remain regarding shark populations in Greece. These include population size, migration routes, breeding areas, nursery habitats, and long-term impacts of climate change.

We also lack sufficient understanding of the effects of pollution, coastal development, and habitat degradation. More research is urgently needed, especially given that more than half of shark and ray species in Greece are considered threatened with extinction.

What is the ecological importance of sharks?

Sharks are apex predators and play a crucial role in maintaining the balance of marine ecosystems. They regulate populations of other species and help maintain the structure and stability of food webs.

Their presence indicates a healthy and functioning ecosystem capable of supporting top predators. In this sense, they are as ecologically important as other iconic marine species, such as dolphins.

Their absence can lead to major ecological imbalances and long-term degradation of marine habitats.

What is the real risk to swimmers?

Scientific evidence shows that the risk to swimmers in Greece is extremely low. According to global shark incident databases (https://www.floridamuseum.ufl.edu/shark-attacks/maps/world-interactive/), the last recorded incident in Greece occurred in 1980, and it was not fatal. In total, only eight confirmed incidents have ever been recorded, all before 1980.

Even these records should be interpreted with caution, as some cases lack strong evidence confirming shark involvement.

Therefore, for an average swimmer in Greece, the risk is practically negligible. For comparison, more than 370 people die annually from drowning in the country, highlighting the difference between perceived and real risk.

What should you do if you see a shark while swimming?

The appropriate response is to remain calm. Exit the water slowly and calmly, inform other swimmers and the relevant authorities, and avoid any attempt to approach, photograph, or interact with the animal.

All documented cases involve passing animals that do not show aggressive behavior toward humans. Do not touch or provoke the animal, and avoid actions that could cause panic in both people and wildlife.

These are the standard international guidelines used in countries where shark encounters are more frequent, including Australia, South Africa, and the United States.

Are sharks dangerous to humans?

Available scientific data do not support the idea of an increasing threat to swimmers. On the contrary, sharks in Greece are far more threatened by human activity than humans are by sharks.

Overfishing, bycatch, habitat degradation, and lack of data are the main challenges for the conservation of these iconic species in Greek waters.

Title: Conservation Officer of iSea | Vice Chair of the IUCN Shark Specialist Group | President of the European Elasmobranch Association

Contact details: ioannis.giovos@isea.com.gr

Dimitris Moutopoulos

Dimitris Moutopoulos

Is there any reason for concern about the “increase” in sightings of organisms, such as sharks, due to changes in our seas? What do historical data show?

Historical data show exactly the opposite of what the word “increase” implies. A study by the Department of Fisheries and Aquaculture of the University of Patras (Moutopoulos et al., 2022), in collaboration with the Environmental Organisation iSea, identified 197 historical reports of shark attacks in Greek seas over a period of 100 years (1883–1983). The records increased gradually until 1969 and then declined towards the mid-1980s. Larger animals (over 7 meters) declined by 75% between 1951 and 1971 and disappeared completely after 1981. In simple terms, the historical trend is downward..

The appearance of a shark in Greek waters today is not a “new” or “alarming” phenomenon; i

It is a return to something that was common 60–70 years ago. At that time, humans and sharks shared the same marine space, and large shark species were common in Greek seas, something that is not reflected in modern fisheries survey data. If anything has changed, it is the opposite: Mediterranean is a global hotspot for shark extinction, mainly due to overfishing. Therefore, any sporadic “reappearance” we observe today does not mean conditions are worsening; rather, it reflects improved observation (social media, smartphones with high-resolution cameras) of a population that was never fully gone, just largely forgotten.

Is the recording of species that have recently become “famous” in Greek seas rare?

No. Many of the species that cause public concern today (e.g., large sharks, rays, etc.) have a well-documented historical presence:

  • The great white shark (Carcharodon carcharias) was recorded in Lesvos in 1952
  • The six gill shark (Hexanchus griseus) was reported in three cases
  • The basking shark (Cetorhinus maximus) was recorded multiple times
  • The smalltooth sand tiger shark (Odontaspis ferox) was recorded in the eastern Aegean

Therefore, the “novelty” often perceived today, when such species are observed, is more a result of gaps in collective memory than actual rarity. Each generation tends to consider as “normal” what it saw during its own lifetime, forgetting what came before. The generation of 2020 sees as rare what the generation of 1955 considered common.

So, is the panic presented by the media justified, or is it sensationalism?

Based on the data, the ratio is striking: three fatal shark attacks on humans over 83 years (1900–1983) in a country with thousands of kilometers of coastline and millions of swimmers every summer. Today, there are no recorded attacks at all.

Despite the absence of shark attacks in Greece today, misunderstandings, misinformation, sensational portrayals of sharks, and fear-driven narratives continue to dominate the media, reflecting a lack of understanding of sharks. This misinformation shapes negative attitudes toward sharks for over a century, undermining conservation efforts.

The conclusion is clear: today’s panic is not based on increasing risk, but on a lack of historical perspective combined with sensationalism, as “sharks” make for attention-grabbing news regardless of actual risk. Just as earlier fear-based narratives in newspapers (1950s–1960s) did not reflect real threats, today’s portrayal of sharks often similarly diverges from reality.

Title: Professor, Department of Fisheries and Aquaculture, University of Patras

Contact details: dmoutopo@upatras.gr