Blue-green algae alarm at Altmühlsee: health risks for bathers!

Blue-green algae alarm at Altmühlsee: health risks for bathers!

In an alarming development, the health department in the Weißenburg-Gunzenhausen district has issued a swimming warning for Lake Altmühlsee. The reason for this is the increased occurrence of blue-green algae, which can multiply rapidly at high temperatures and calm water. How nn.de Reportedly, at the end of last week, bathing bans were even announced for several bathing areas on Altmühlsee, although the situation appears to have improved recently. However, today, July 4th, there is still a bathing warning for the Altmühlsee, while the bathing areas on the Brombach and Hahnenkammsees have not yet been affected.

Health authorities regularly monitor water quality and fecal bacteria to ensure that swimming is not dangerous. It should be noted that blue-green algae, or more precisely cyanobacteria, pose health risks not only to humans but also to animals. Scientific studies show that high concentrations of cyanobacteria, which produce toxic substances, can cause a variety of ailments upon contact. These include skin and mucous membrane irritations, nausea, diarrhea and even respiratory diseases, as the Pharmacy Umschau explains ( apotheken-umschau.de ).

The danger of blue-green algae

What many people don't know: Blue-green algae are not actually algae, but one of the oldest life forms on earth, known as cyanobacteria. They are particularly active during periods of great heat in summer and can become visible as greenish streaks in the water. Pregnant women, immunocompromised people and children are particularly at risk. You are strongly advised to take extra care when bathing and to shower thoroughly after contact with contaminated water.

The situation is being closely monitored in the region. A rule of thumb is that your feet should be visible in knee-deep water. If visibility is poor or the water is greenish, you should avoid swimming. The health authorities regularly provide information about changes and current risks on the district office's homepage.

Environmental conditions and impacts

Climate change plays a central role in the frequency of blue-green algae blooms. The increasing temperatures favor the growth of these microorganisms, as the Federal Environment Agency states ( Umweltbundesamt.de ). In addition, increased phosphorus and nitrogen concentrations, usually from fertilizers, promote flower formation. It is therefore important to monitor nutrient concentrations in water bodies to ensure long-term water quality.

In the past, there have been regular health risks from cyanobacteria, especially in very warm summers. A quick response from the authorities and regular checks are essential to guarantee a safe bathing experience for both people and animals.

To ensure the safety of bathers, it is advisable to check current conditions and warnings before swimming. This is the only way to ensure that the cool water that looks so inviting on hot summer days is actually harmless.