Dangerous lionfish spotted near Croatian islands

(Photo: H. Zell/CC BY-SA 3.0)

An invasive and highly venomous species is becoming a common sight in the Adriatic.

The lionfish (Pterois), also known as the firefish or peacock fish, has been spotted near the Croatian islands of Korčula and Mljet, and experts warn that its numbers are likely growing across the region, writes daily Jutarnji list.

A Serious Threat to the Ecosystem

Originally from the Indo-Pacific, the lionfish is considered one of the most dangerous invasive species in the Mediterranean.

It spreads quickly due to its rapid growth, early reproductive maturity, and adaptability to different environments.

With very few natural predators apart from octopuses and some grouper species, its population can grow unchecked, disrupting local ecosystems.

“Without natural predators, the spread of lionfish poses a serious challenge to marine biodiversity,” says Karla Jelić, an expert in marine conservation.

“They consume large amounts of native fish, threatening the balance of the ecosystem. Although we don’t know the exact number of lionfish in the Adriatic, their ability to adapt suggests they will continue to expand.”

Lionfish (Photo: Jens Petersen/CC BY 2.5)

A Risk to Humans

All of the lionfish’s spines are venomous, and a sting can cause extreme pain and serious symptoms. In some cases, people may experience breathing difficulties or temporary paralysis, though no fatal incidents have been recorded.

If stung, experts advise immediate medical attention.

Fortunately, the venom is heat-sensitive and can be neutralised by immersing the affected area in warm water (40-45°C) for 30-90 minutes. Care must be taken to avoid burns.

Here to Stay

The lionfish was first recorded in the Adriatic in 2019, with its northernmost sighting near Vis in 2021. As sea temperatures continue to rise, experts expect its presence to become even more common.

While this fish is not aggressive and stings occur mostly by accident, awareness is key. Fishermen and divers should exercise caution when handling or encountering this striking but dangerous species.