Massive proliferation of blue-green algae, which can release toxins, has been recorded along the Baltic Sea coast in Germany and Poland. As a result, authorities are warning about the dangers of swimming and have already introduced bans at some beaches. t-online reports, writes UNN.
Details
High water temperatures, strong sunlight and nutrient-rich water at the end of summer promote the growth of blue-green algae. This situation is currently also being observed in the Baltic Sea.
Because of blue-green algae, swimming is currently not recommended at some beaches along the German and Polish Baltic Sea coasts. The relevant health authorities are warning about this. Contamination was detected at several beach sections near Rostock, as well as at four Baltic beaches in Poland.
To the west of Warnemünde, the city of Rostock warned of a possible concentration of blue-green algae. The warning concerns beach sections 30 to 36, approximately level with the New Cemetery and extending farther along the Baltic Sea coast in a westerly direction. For safety reasons, Rostock’s public health department currently recommends not swimming there and avoiding skin contact with the algae. An official swimming ban was not initially imposed.
Blue-green algae can cause health problems
The warning applies particularly to children and dogs. Dogs should not drink this water either. Blue-green algae can produce toxins that may cause health problems. In the event of skin contact, possible effects include irritation, swelling and allergic reactions. If blue-green algae or water contaminated with them is swallowed, gastrointestinal problems and vomiting may occur. In severe cases, breathing difficulties are also possible.
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In Poland, authorities have already imposed a swimming ban because of the extensive spread of blue-green algae. The restrictions apply to the Jastarnia-Leśna and Jurata-Mierzeja beaches on the Hel Peninsula, as well as Gdynia-Redłowo and Mechelinki in the Gulf of Gdańsk. The duration of the ban will depend on how the situation develops. Authorities note that the situation may change even within a single day, Polskie Radio reports.
Background
Despite their name, blue-green algae are not actually algae but belong to a group known as cyanobacteria. They occur naturally in lakes, rivers and coastal waters. They proliferate particularly actively at high temperatures, with abundant sunlight, and in calm, nutrient-rich water.
The bacteria can accumulate on the surface of the water in the form of streaks or entire "mats." At the same time, wind and currents can move or disperse such concentrations within a short period. The presence of blue-green algae can usually be identified by a blue-green discoloration of the water.
According to a rule cited by Nordkurier, if you can no longer see your own feet when standing in knee-deep water, you should refrain from swimming. Holidaymakers are advised to continue monitoring current warnings at the beaches and follow the instructions of the authorities and lifeguards.