The ship, called the Po, sank off Vlora Bay in 1941 after being hit by a torpedo from a British Fairey Swordfish aircraft during the Greco-Italian War, one of the conflicts within World War II. It is now acting as an artificial reef, with over 80% of its surface teeming with marine life, researchers reported July 27 in the journal Frontiers in Ocean Sustainability.
While there has been research on Vlora Bay generally, there was no historical biological or quantitative data for the Po wreck itself. The study was conducted to find out more about how its structure affected the surrounding seabed and how marine organisms have colonised.
Devil firefish (Pterois miles) are native to warm coastal waters and coral reefs of the West Indian Ocean and the Red Sea. However, the new study found these fish swimming around the shipwreck off the coast of Albania, around 800 miles (1,300 kilometres) away, between June 2022 and September 2024, with up to seven individuals observed simultaneously. The study authors suggested that shipwrecks like Po could be attracting these invasive animals from their natural habitat toward more temperate waters.
The Po, a sunken WWII hospital ship, has been colonized by a range of marine animals and plants. (Image credit: Mauro Pazzi)
The researchers noted that the presence of these fish is part of a wider problem: More invasive species are migrating from the Red Sea through the Suez Canal and into the Adriatic Sea due to warming global temperatures. Modugno said she expects a "serious problem" involving the devil firefish within the next 10 years.
The study confirmed that this was one of the northernmost reported occurrences of the firefish in the Adriatic Sea.
Related storiesHowever, invasive species aren't the only ones attracted to these shipwrecks. The researchers also noted 28 fish species living around the wreck, egg clusters belonging to the Ommastrephidae family of squid, and even sightings of the rare Mediterranean monk seal (Monachus monachus).
This monk seal species typically breeds in sheltered sea caves across Mediterranean beaches. However, tourism and other human activities have forced the species into more isolated and dangerous caves. This, along with other threats from fishing entanglement, continue to threaten the seals. The sighting indicates that monk seals are using these artificial reefs as potential resting opportunities when their natural habitats are fragmented, the researchers said in the study.
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