Recommended Free Tools
The invasive and deadly fish species spotted in the Mediterranean is the silver-cheeked toadfish, Lagocephalus sceleratus. A 522-millimeter male weighing 1,330 grams was caught in Medulin Bay, Croatia, on 13 May 2024. The fish is dangerous because of tetrodotoxin and powerful jaws, although one capture does not prove a region-wide northern Adriatic population.
The record is significant because it documents the species farther north than previously reported in the Adriatic and Mediterranean. The fish is an Indo-Pacific pufferfish that entered through the Suez Canal, spread westward, and can harm people, fisheries, native species, and marine ecosystems.
Key takeaways
- The fish is the silver-cheeked toadfish, Lagocephalus sceleratus, not a lionfish.
- A male measuring 522 millimeters and weighing 1,330 grams was caught in Medulin Bay, Croatia, on 13 May 2024 at 19.7 meters depth.
- The 2025 scientific record called the catch the fourth Adriatic record and the northernmost reported Mediterranean record for the species.
- Tetrodotoxin makes the fish unsafe to eat, while its powerful jaws can cause serious bites.
- The fish reached the Mediterranean through the Suez Canal and has expanded westward, but one northern Adriatic capture does not prove a self-sustaining population across the region.
- Anyone who catches or sees a suspected specimen should avoid unnecessary contact, document the location safely, and follow local reporting instructions.
What does the invasive and deadly fish species spotted in the Mediterranean look like?
The invasive and deadly fish species spotted in the Mediterranean is the silver-cheeked toadfish, also called the silver-cheeked pufferfish. Its scientific name is Lagocephalus sceleratus. The fish is a pufferfish in the family Tetraodontidae, and it should not be confused with the unrelated lionfish, which has a different toxin and a different injury mechanism.
The specific record behind the recent concern came from Medulin Bay near southern Istria, Croatia, in the northern Adriatic Sea. The fish was a male measuring 522 millimeters and weighing 1,330 grams. It was caught on 13 May 2024 at a depth of 19.7 meters, according to the 2025 scientific record of the Medulin Bay specimen.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →#1 Best Overall
Why did the Medulin Bay sighting matter?
The Medulin Bay sighting mattered because it extended the documented northern range of a highly invasive species. The authors described the specimen as the fourth Adriatic record and the northernmost record in both the Adriatic and Mediterranean seas reported in their 2025 paper.
A confirmed capture shows that the species reached that location; it does not by itself show that a breeding population has become established throughout the northern Adriatic. The available research did not establish a current 2026 abundance estimate for the northern Adriatic or prove that the Medulin specimen represents a self-sustaining local population.
| Question | What the evidence shows | What it does not show |
|---|---|---|
| Was the fish present in the northern Adriatic? | A male silver-cheeked toadfish was caught in Medulin Bay on 13 May 2024. | That every part of the northern Adriatic now contains the species. |
| How far north was the record? | The 2025 paper described it as the northernmost reported Mediterranean record at publication. | A complete present-day map of the species’ abundance. |
| Does one capture prove establishment? | It confirms occurrence and supports concern about range expansion. | A self-sustaining breeding population across the northern Adriatic. |
The scientific authors summarized the concern directly: “The further spread of this tetraodontid species in the Adriatic poses ecological and socio-economic risks, such as disruptions to fisheries, biodiversity loss, and threats to marine ecosystems.” — Neven Iveša, Moira Buršić, and Jakov Dulčić, authors of the 2025 record, published record of the northernmost Mediterranean specimen.
Is the silver-cheeked toadfish poisonous?
Yes. The silver-cheeked toadfish is associated with tetrodotoxin, commonly abbreviated TTX, a potent neurotoxin that can cause severe pufferfish poisoning and death. Toxin concentration can vary between tissues and individual specimens, so a fish that looks healthy or appears properly cooked should not be treated as safe to eat.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Research has detected tetrodotoxin and the related compound 4,9-anhydro TTX in different tissues of the silver-cheeked pufferfish. The peer-reviewed toxicology study on tetrodotoxin concentrations supports the key safety point: identifying, preparing, or cooking a suspected fish is not a reliable way for the public to make it safe.
According to a 2024 peer-reviewed review of Eastern Mediterranean pufferfish incidents, researchers recorded 198 documented human-health events from 2004 through 2023: 28 physical attacks, at least 143 non-lethal poisoning episodes, and 27 fatalities. These are documented events in the review period, not an estimate of the total number of fish and not a claim that every encounter is fatal.
Can you eat a Mediterranean silver-cheeked toadfish?
No. People should not eat, sell, prepare, or experiment with a suspected silver-cheeked toadfish. The presence and concentration of tetrodotoxin can vary by specimen and tissue, and ordinary cooking is not a public-safety solution. Consumption of pufferfish has caused serious poisonings and deaths in the Mediterranean.
Do not turn the fish into food for people, dogs, cats, aquarium animals, or wildlife. If a suspected specimen has been caught, keep children and pets away from it and follow local fisheries, marine-research, or wildlife instructions for the catch. This article does not recommend a universal handling method because reporting and disposal rules can differ by location.
Can the silver-cheeked toadfish bite?
Yes. The silver-cheeked toadfish has powerful jaws and can inflict serious bites. Gloves, pliers, fish-grip tools, or other fishing equipment should not be presented as making a close encounter safe, and such products cannot neutralize tetrodotoxin.
Rank #2
- Fully Updated for 2026 Regulations: This new edition integrates the 2026 Fishing Regulation Updates, including current seasons and size limits for Gag Grouper, Red Snapper, and the April 1st Lane Snapper changes. No more checking websites while on the water—everything you need is right at your fingertips
- Set of 4 Waterproof Fishing Cards：This 8.2"L x 6"W ring-bound set features 4 double-sided durable PVC cards—essential saltwater fishing gear for Florida anglers. Rugged, tear-resistant, and waterproof, it’s ideal for salt water fishing, boats, beaches, or diving. Bend, or wipe clean without damage
- True-to-Life Fish Identification：Vibrant, double-sided photographs make identifying 80+ Atlantic fish and sharks effortless—even in sunlight. Perfect for shark fishing gear kits or saltwater fishing trips
- Essential Fishing Rules & Regulations：Covers size limits, catch rules, and regulations to ensure legal and responsible fishing. A must-have salt water fishing stuff guide for Florida visitors or locals targeting compliant catches
- Ring Binding for Portability & Convenience：Secured with a sturdy ring binding, these compact cards stay organized and fit in tackle boxes (great for saltwater fishing gear storage), backpacks, or glove compartments. Take them anywhere—pier, boat, or fridge—without losing a page
Divers should not touch or corner the fish. Fishers should avoid putting hands near the mouth and should not pose for photographs while holding a suspected specimen. The safest general response is to minimize contact, keep other people and animals away, record the location from a safe distance if possible, and contact the appropriate local authority.
How did this pufferfish reach the Mediterranean?
The silver-cheeked toadfish is a Lessepsian migrant: it moved from the Indo-Pacific into the Mediterranean through the Suez Canal. Scientific research describes a rapid expansion from the eastern Mediterranean toward central and western waters. A 2018 distribution-modeling study forecast continued spread and potentially high impacts on fisheries without intervention; see the Ecological Modelling research on the ongoing invasion of Lagocephalus sceleratus.
Climate change may help enable broader changes in Mediterranean species distributions, but the reviewed research does not establish that climate change alone caused the Medulin Bay sighting. The defensible explanation combines an established Suez Canal invasion pathway, the species’ biology, movement and dispersal opportunities, and changing environmental conditions.
What damage can the silver-cheeked toadfish cause?
The silver-cheeked toadfish is an opportunistic predator that can affect native species and fishing activity. Research from the eastern Mediterranean has found fish and invertebrates in its diet. The Medulin specimen’s stomach contained bivalves, gastropods, sea-urchin fragments, and inorganic particles, according to the study of the species’ ecological characteristics in the eastern Mediterranean.
- Catch damage: the fish can bite and damage fish caught in nets or on lines.
- Gear damage: its jaws can damage fishing nets and other equipment, increasing costs for fishers.
- Predation: the species consumes fish and invertebrates, including organisms that native predators and fisheries may depend on.
- Competition: the invasive fish can compete with native species for food and habitat.
- Public-health costs: poisoning and bite risks increase where fish are caught, handled, sold, or consumed illegally.
- Ecosystem change: sustained spread can contribute to biodiversity loss and changes in marine food webs.
The review of the silver-cheeked toadfish’s biology and ecology describes the species as a major concern because toxicity, predation, fishery damage, and economic effects occur together. The severity of the effect can vary by location and population; the Medulin record alone does not quantify future damage in the northern Adriatic.
Is this fish part of a larger Mediterranean invasion?
Yes. The silver-cheeked toadfish is one example of a wider pattern of non-indigenous marine species entering and establishing themselves in the Mediterranean and Black Sea. According to the Food and Agriculture Organization of the United Nations in 2022, more than 1,000 non-indigenous species had been identified in the Mediterranean and Black Sea, and more than half had established permanent populations.
FAO also warned that poisonous and venomous non-indigenous fish create human-health concerns and described regional efforts involving mapping, monitoring, management, and cooperation among Mediterranean countries. The broader invasion pattern provides important context, but different non-native species do not have identical toxins, rates of spread, ecological roles, or management options.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
How is the silver-cheeked toadfish different from a lionfish?
The silver-cheeked toadfish and lionfish are different invasive fish and should not be grouped together as though they pose the same hazard. The silver-cheeked toadfish presents a tetrodotoxin-related consumption risk and a powerful-jaw bite risk; a lionfish comparison involves venomous spines and puncture injury. Their identification, ecological effects, distribution histories, and management responses are different.
| Comparison point | Silver-cheeked toadfish | Lionfish |
|---|---|---|
| Species discussed here | Lagocephalus sceleratus | A different invasive fish, not the species in the Medulin record |
| Primary hazard described in this research | Tetrodotoxin-related poisoning and powerful-jaw bites | Venomous-spine puncture injury |
| Safe public response | Do not eat or handle unnecessarily; report credible sightings | Follow species-specific local safety and reporting guidance |
| Why identification matters | Prevents confusion with other pufferfish and native species | Prevents treating a different fish and injury mechanism as the same hazard |
For readers who regularly explore, fish, or document Mediterranean wildlife, a Mediterranean fish identification book or Mediterranean marine life field guide can help with visual identification. A field guide supports recognition only; it does not replace official advice, make a suspected pufferfish safe to handle, or make it safe to eat.
What should you do if you catch or see one?
People should not eat a suspected silver-cheeked toadfish, attempt to prepare it, or handle it unnecessarily. Fishers and divers should report credible sightings through local fisheries, marine-research, or wildlife channels and follow local instructions for specimens caught in nets or on lines.
- Move people and pets away. Keep children, dogs, cats, and other animals from touching, biting, or eating the fish.
- Do not handle it casually. Avoid the mouth and do not attempt to pose with, dissect, clean, cook, or release a fish while following unsafe handling practices.
- Record useful information safely. If possible without approaching the fish, note the date, location, depth, and circumstances and take a photograph from a safe distance.
- Contact the local authority. Use the relevant fisheries agency, marine-research institution, wildlife authority, or local reporting channel. There is no single universal reporting hotline or region-wide handling protocol established by the supplied research.
- Seek urgent medical help after exposure. Anyone bitten or suspected of eating the fish should contact emergency medical services or poison-control services immediately and explain the suspected pufferfish exposure.
What should authorities do next?
The scientific record calls for monitoring, regulation, public education, and citizen-science involvement. FAO’s regional work likewise emphasizes mapping, monitoring, coordinated management, and cooperation among Mediterranean countries.
Monitoring is especially important because the Medulin capture establishes a northern occurrence but does not reveal abundance, reproductive success, or the future speed of expansion. Public education can reduce poisoning and bite incidents, while reliable reports from fishers and divers can help researchers track the species’ changing distribution.
Marine conservation education, aquarium or marine-museum membership, and verified invasive-species citizen-science programs may eventually give the public constructive ways to support monitoring. Any specific program should be checked locally before participation because availability and reporting procedures vary by country.
Frequently Asked Questions
Is the silver-cheeked toadfish poisonous?
The silver-cheeked toadfish is poisonous because it can contain tetrodotoxin, a potent neurotoxin associated with severe pufferfish poisoning and death. Toxin levels vary between tissues and specimens, so the fish should not be eaten or prepared for consumption.
Where was the invasive pufferfish found in Croatia?
The documented Croatian specimen was caught in Medulin Bay near southern Istria on 13 May 2024 at a depth of 19.7 meters. The 2025 scientific paper described the catch as the fourth Adriatic record and the northernmost reported Mediterranean record at publication.
Free tools Windows power users keep installed
One-click scans. No signup required.
What should I do if I catch or see a silver-cheeked toadfish?
Do not eat or handle a suspected silver-cheeked toadfish unnecessarily. Keep people and pets away, record the location from a safe distance if possible, and report the sighting or catch to the relevant local fisheries, marine-research, or wildlife authority.
Does the Medulin Bay fish prove that silver-cheeked toadfish are established across the northern Adriatic?
One capture confirms that the silver-cheeked toadfish reached Medulin Bay, but it does not prove that a self-sustaining population exists throughout the northern Adriatic. Additional monitoring is needed to determine abundance and reproductive success.
The Bottom Line
The silver-cheeked toadfish (Lagocephalus sceleratus) found in Medulin Bay is a genuine invasive-species and public-health concern, but one 2024 capture is not proof that the fish has established throughout the northern Adriatic. Do not eat or handle a suspected specimen; keep pets and children away, document the sighting safely, and report it to local authorities.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
