Research from Wageningen University and Research, the Netherlands, reveals invasive lionfish are rapidly expanding their territory in the Mediterranean sea, causing severe ecological damage.
Published in the open-access journal NeoBiota, the study shows the lionfish species Pterois miles – known as the devil firefish – has established presence in the eastern Mediterranean, with observations now extending to colder waters previously thought to be unsuitable for the species.
Originating from the Indo-Pacific region, the lionfish species Pterois miles and Pterois volitans are regarded as the most successful and lethal invasive fishes in marine ecosystems, with the capacity to drastically affect local fish communities and biodiversity in invaded areas.
The invasion of Pterois miles in the Mediterranean Sea began around ten years ago. Genetic studies reveal the invasive fish originated from the Red Sea and likely entered through the Suez Canal.
Lionfish are generalist predators and impact ecosystems by preying extensively on local fishes, including endemics of high conservation value. As they are unaccustomed to lionfish, native prey species usually do not flee from this new predator.
“After years studying these predators, I find it amazing how they can easily adjust to so many different environments and be successful in areas so different from where they evolve.”
“It is always impressive to see how such a flamboyant and–to us–conspicuous predator can approach its prey without being noticed”
The study’s lead author, Davide Bottacini.
The fin spines of Pterois miles are highly venomous. A sting can cause extreme pain, sickness, convulsions, minor paralysis, and breathing difficulties in humans. Immediate emergency medical attention is recommended for anyone stung by the species.
By reviewing existing scientific data, researchers identified gaps in current understanding of the lionfish’s interactions with Mediterranean ecosystems.
They suggest that, while they consider the eradication of invasive lionfish impossible, tackling questions such as the community-level impact of them in the Mediterranean, and the evolutionary and learned responses in prey, will add to the body of knowledge on the best documented invasion in marine ecosystems.
Such information provides insights vital for biodiversity conservation, with practical implications for policy makers aiming to devise efficient mitigation plans.
Citizen science initiatives for tracking and reporting lionfish sightings are encouraged to provide valuable data that supports ongoing research efforts. Such community involvement is essential for enhancing understanding of the invasion dynamics and devising effective control measures.
Original source
Bottacini D, Pollux BJA, Nijland R, Jansen PA, Naguib M, Kotrschal A (2024) Lionfish (Pterois miles) in the Mediterranean Sea: a review of the available knowledge with an update on the invasion front. NeoBiota 92: 233–257. https://doi.org/10.3897/neobiota.92.110442