Blue-green algae alarm: Bathing ban in Ostprignitz-Ruppin is imminent!

Blue-green algae alarm: Bathing ban in Ostprignitz-Ruppin is imminent!

In recent days, alarming reports of increased sightings of blue-green algae have emerged in several lakes in the Ostprignitz-Ruppin district. The Borker See, the Große Baalsee near Walkmühle and the Königsberger See at the Königsberg campsite are the main affected areas, while a laboratory test is currently underway in the Jahnbad on the Ruppiner See to determine whether there is also a blue-green algae bloom there. Swimming is strongly discouraged in these places due to severely limited visibility of less than 0.5 meters, as the Borkener Zeitung reports.

Blue-green algae, scientifically known as cyanobacteria, require summer temperatures to multiply explosively and produce toxic substances. These bacteria are often found in shallow lakes, especially in warm, dry weather and little wind. In principle, they can occur massively at water temperatures of 20 degrees, especially in nutrient-rich waters, according to information from NDR.

Health risks for humans and animals

The health risks posed by blue-green algae should not be underestimated. The symptoms of possible poisoning range from nausea and vomiting to body aches and respiratory illnesses. People with previous illnesses and children who are too sensitive to the toxic substances are particularly at risk. Contact with the contaminated water can cause allergies and skin irritation, while deaths have even been documented in animals drinking such water. The rule of thumb applies: If your feet are no longer visible in knee-deep water because of the bluish-green turbidity, you definitely shouldn't swim, according to the Leibniz Institute for Baltic Sea Research.

When talking about exactly how these problems arise, climate change must be mentioned. High temperatures and excessive nutrient input into water bodies are not only leading to an increase in algae blooms at present, but also to dramatic changes in ecosystems in the long term. While blue-green algae are important in small quantities, producing about 20% of the world's oxygen, blooming masses of these bacteria can create oxygen-deficient zones in the water and threaten the survival of fish and other organisms.

Prevention measures and official warnings

Against this background, it is crucial that citizens stay regularly informed about water quality and use official bathing areas. In the case of blue-green algae contamination, health authorities issue strict swimming warnings or even bathing bans. These measures can also be expected in 2025 on the Baltic Sea and in many other German lakes. The NDR emphasizes that nature also reacts to human influence, and it is time for us to become aware of our responsibility for our waters.