The "Tun-Sea" association for collaborative sciences has reported that the proliferation of the white-spotted jellyfish, which has been spotted on some Tunisian beaches, could lead to increased pressure on available food and subsequently on the entire marine food chain. This species feeds on zooplankton, small creatures that live in water and represent a vital food source for many marine animals.
The association has observed significant quantities of the white-spotted jellyfish on beaches in the Gulf of Tunis, particularly in Marsa, Gammarth, and Hammam Chott. They note that this species is not native to the Mediterranean Sea, but rather originates from the Western Pacific Ocean, and that maritime transport can easily facilitate its transfer between regions.
The white-spotted jellyfish is characterized by its rounded, semi-transparent bell, covered with white spots, and can reach a diameter of approximately 50 cm. The first documented scientific observation of this species in Tunisia occurred in August 2012, in Lake Bizerte, where small jellyfish were spotted, followed by adult specimens between September and November of the same year.
The species reappeared in 2013, indicating the presence of a local breeding population. The association emphasizes that it is more accurate to describe the current situation as a new wave of appearances in large numbers of a previously existing invasive species, rather than a first-time appearance.
The "Tun-Sea" association has called on citizens to report any sightings of this species in the sea or on beaches, providing detailed information on the location, date, and time of the observation, as well as any available photos or videos. This information will enable experts to verify the species and monitor its spread and population changes.
The association stresses that the white-spotted jellyfish is not classified as a highly dangerous species to humans, as its sting is usually mild and barely perceptible. However, scientific experiments in the Mediterranean have shown the value of citizen participation in monitoring jellyfish, and the association encourages citizens to contribute to this effort.
The "Tun-Sea" association's warning highlights the potential risks associated with the appearance of invasive species in Tunisian waters, and the need for continued monitoring and research to mitigate their impact on the marine ecosystem.
Key points
- The white-spotted jellyfish feeds on zooplankton, a vital food source for many marine animals.
- The species is not native to the Mediterranean Sea, but rather originates from the Western Pacific Ocean.
- Citizens are encouraged to report any sightings of the white-spotted jellyfish to help experts monitor its spread and population changes.
