Resolved Situation with Massive Fish Deaths in Lake Dresden
In the heart of Dresden, a tragic event has unfolded in the Carolasee. Over 70 bream have been found dead in the waterbody, with the first casualty reported more than a week ago.
The cause of this mass fish death has been traced back to high concentrations of green algae. On September 17, 2025, lab analyses confirmed the presence of two species of these harmful algae in the water.
Green algae are known to multiply rapidly in warm weather, and they pose a significant threat to aquatic life. In the current hot summer, many water bodies are at risk of tipping, with the oxygen content dropping so much that fish die.
This unfortunate incident has had a profound impact on the local fishermen in Saxony-Anhalt, who are now adapting to new environmental conditions. The high temperatures and green algae have negatively affected the fish population in Carolasee, reducing fish numbers and habitat quality.
The spread of green algae is not limited to Carolasee. They have also been detected in the Bautzen dam, leading to a health department advisory against bathing. Similarly, some beaches at the Bleiloch reservoir in Thuringia have been closed due to green algae.
Moreover, there was a danger to bathers in the Quitzdorf reservoir due to green algae. While the fish die-off only affected bream, these algae can cause serious health problems for humans, including skin irritations, stomach problems, and even liver damage if ingested.
In an effort to combat this issue, emergency aid has been deployed in Saxony-Anhalt. A mobile device pumps out old water and replaces it with fresh, clean water. Boat rental in the Carolasee has also been temporarily suspended.
However, the cause of the fish die-off in the Hörsel remains unclear. As researchers continue to investigate, it is crucial to remain vigilant and take necessary precautions to protect both our aquatic life and public health from the harmful effects of green algae.
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