‘Better safe than sorry’: Greece installs floating barrier to ward off toxic fish
From his deckchair, his arms thrown above his head, his feet sliding back and forth in the sand, Pavlos Beleyiannis watches his grandchildren bathe in his favourite bay. It’s an idyllic scene, infused with a serenity that the newly retired truck driver attributes squarely to a sense of security. For the first time, a floating barrier has been installed across the bay. Ducking, splashing and larking about, the children have not ventured beyond it. “Thank god it’s there to protect them,” he says with evident relief. “There weren’t such dangers in these seas when I was a child.” Until last summer, the perils that lurked beneath the northern Gulf of Euboea – waters that separate the island of Evia from the Greek mainland – were, it was thought, limited to purple jellyfish. Last year, the mauve stingers had pharmacists working overtime in Chalkida, the island’s bustling capital 80 miles (130km) north of Athens, after a surge of attacks on swimmers. The arrival, thanks to the climate crisis, of toxic, long-toothed pufferfish – capable of chomping through bone, metal and wooden blocks – has posed a different threat: in an unprecedented step, the Greek Red Cross issued a public health warning advising citizens to seek emergency care if bitten by the fish because its “beak-like jaws” could cause severe wounds and heavy bleeding.
In no way should the species be consumed, it said, because of a potentially lethal neurotoxin, tetrodotoxin, contained in its organs and flesh. With no known antidote to counter the poison, the invasive species can kill not only predators – investing pufferfish with an unparalleled ascendancy in the food chain – but also any humans who eat it. “Our duty and primary concern has to be the safety of our citizens,” says Antonis Spanos, Chalkida’s vice-mayor, who oversaw the installation of the floating barrier – the first in Greece – last month. “It’s better to be safe than sorry.” At 40, the energetic Spanos belongs to a new breed of determinedly proactive local politician. He says authorities have spent months going through the process of securing funds and putting out tenders to ensure the most protective barrier could be installed, before the system was approved by the state general laboratory.
“Two and a half kilometres of this net will be set up in bays around the gulf to allow for a carefree summer,” he says. “Last year it was bad with the jellyfish but, as you say in English, we’ve killed two birds with one stone. Now if there are puffers, we’ll be ready for them too.” He says phones at the town hall have been ringing off the hook with elderly people calling to ask when the systems would be installed. “Just this morning a woman called in saying she’d only feel safe to go swimming with her grandchildren once it was there.” Chalkida, it turns out, is not alone. This week Nikos Choulieris, 63, who has long run a diving school in the town, was out with his team in a fast-moving inflatable boat, anchoring yet more of the floating barriers to the seabed off beaches further up the gulf, as other municipalities followed suit.
“I’ve been diving for more than 40 years and never thought the day would come when I’d be doing this,” Choulieris says. “Sea temperatures have definitely risen and that has made it all the more favourable for what we’re seeing now.” In the coming weeks, an estimated 7km of floating barrier will be delivered by truck to the region from Athens. “I don’t think anything will be able to get through that net, not even the fangs of a pufferfish,” Choulieris says. “It’s very tightly knit and very durable. They’d have to bite away at the same point for a long time to tear it and I don’t think they’re going to do that.” Such is the proliferation of the Lagocephalus sceleratus that officials speak of the entire eastern Mediterranean falling prey to the aquatic pest. Like lionfish, which are naturally native to the Indo-Pacific region, the torpedo-shaped species is said by scientists to have been lured by the Mediterranean’s warming waters, entering the basin through the Suez Canal from the Red Sea. Fishers in Cyprus were the first to report their catches and nets being decimated by the inedible intruder. In 2024, Cypriot authorities introduced financial incentives to quell the proliferation under a government-backed eradication scheme that has resulted in more than 103 tonnes of the silver-cheeked toadfish being removed from coastal waters. The island’s fisheries officer, Katerina Georgiou, has attributed the species’ spread to its “remarkable adaptability”, telling the local outlet Sigma that in the absence of a census it was “impossible to draw reliable conclusions about the overall stock, or future population trends”. The presence of the pufferfish was not a temporary phenomenon but a new reality that could not be ignored, she said. Last week Athens announced a similar “catch” programme, offering a reward of €5.33 (£4.57) for each kilogram of the toxic menace surrendered to authorities. Greek fishers, who similarly complain of nets and fishing gear being destroyed by the species, will also be given fuel subsides under the EU-funded action plan to be applied, initially, in Crete and the southern Aegean. Once collected, the fish, as in Cyprus, will be frozen and incinerated in government facilities, said Margaritis Schinas, the agriculture minister and a former European Commission vice-president. With the initiative aimed as much at protecting the marine environment as supporting coastal and island communities, he said it would probably be expanded. “All this is too late,” sighs Nikos Ayiaskoufitis, 54, enjoying a glass of wine with other amateur fishers in a small harbour that houses the squat building used by their organisation in Chalkida. “No measure is going to be effective because what we’re seeing is part of the law of nature. “The waters have warmed, these fish have migrated, or are going to migrate this way, and I don’t think the bounty is really enough for professional fishers to want to focus on catching pufferfish.”
Greek authorities have also come up against an unforeseen enemy: lovers of the species. A club calling itself the Initiative to Save Puffer Fish emerged last week decrying the eradication efforts, which it argued raised “serious ethical questions” for a creature that clearly required “protection and respect”.
With support from the tourist industry and leading marine fish experts – who have described the outcry as overblown – it is unlikely that the catch campaign will go unchallenged. “Everything we’re hearing is exaggerated,” says Ioannis Batjakas, a marine scientist at the University of the Aegean on the island of Lesbos. In more than 15 years of scuba diving, he says he has only ever seen one pufferfish, although he acknowledges they are prevalent in the seas around Crete. “Yes, they have long teeth and look scary, and, yes, they can be a problem for fishers and their nets, but like most wild animals they don’t attack humans. If they do, it’s very rare and only because they’re provoked. All of this is a case of much ado about nothing.” Still, Beleyiannis remains unconvinced as he looks out at his grandchildren splashing about in the bay. “If you ask me, these barriers should be installed across Greece,” he says. “I saw two jellyfish in the water just outside it this morning. Why not pufferfish? In life, you never know what’s next.”