# European fish die-offs and wildlife crisis due to heat

> Live situation record from CLSTR: https://clstr.news/situations/european-fish-die-offs-due-to-heat-and-water-shortages
> Updated: 2026-08-11T00:00:00.000Z. Sources: 28. Developments: 4.

Extreme heat and water shortages across Europe have led to significant fish die-offs and ecological damage. In Germany, rising river temperatures have stressed freshwater populations, such as the loss of nine tonnes of trout in the Zschopau River. In the Rhine, temperatures have exceeded 26 degrees Celsius, while biologist Carsten Nolting warns that approaching 30 degrees Celsius can be life-threatening for species like pike. Experts anticipate an ecosystem shift where heat-tolerant species like catfish may thrive while brown trout and grayling decline.

In Austria, fish farmers in Tyrol face similar crises due to declining groundwater and warm nights. In Hungary, approximately 150 to 185 tons of fish perished in the Rétimajor and Rétszilasi ponds, threatening protected wetland sites. The crisis has also impacted terrestrial wildlife, with the German Animal Welfare Federation warning that squirrels, deer, and hedgehogs are struggling due to a lack of drinking water.

Recent observations in Germany highlight ongoing environmental shifts. The Rhine Water Investigation Station, marking its 50th anniversary, reports that climate change is visibly altering the river through shifting precipitation patterns and rising temperatures that affect oxygen levels and depth. In recreational areas like Augsburg, water levels in lakes and canals have dropped by as much as a meter. Some lakes are reaching temperatures of 27 degrees Celsius, accompanied by increased algae growth and reduced currents due to low water volume.

## Timeline

### 2026-08-11: Wildlife in crisis as heat and drought impact Germany and Austria

Severe heat and drought in Germany and Austria are threatening wildlife, causing fish deaths in drying streams and lethal nest temperatures for young birds, prompting urgent calls for human assistance.

21 sources. https://clstr.news/cluster/north-rhine-westphalia-aquatic-life-threatened-by-rising-water-temperatures

### 2026-08-08: Drought triggers fish deaths in Hungary and water shortages in Germany

Drought conditions are causing mass fish deaths in Hungarian wetlands and forcing the closure of water therapy facilities in Bad Wörishofen, Germany, to prioritize water conservation.

2 sources. https://clstr.news/cluster/drought-triggers-fish-deaths-in-hungary-and-water-shortages-in-germany

### 2026-08-08: Rétimajor fish mortality due to drought and water scarcity

Drought and heatwaves in Hungary have caused the death of up to 185 tons of fish in the Rétimajor wetlands, causing massive economic losses and threatening a protected international habitat.

5 sources. https://clstr.news/cluster/rtimajor-fish-die-off-185-tons-of-fish-lost-to-water-shortages

### 2026-07-13: German rivers see fish die‑offs as heat wave overwhelms cooling pools

Heat wave strains German river cooling pools in Freiburg and kills trout at a Saxony farm, causing ecological stress and economic loss.

7 sources. https://clstr.news/cluster/free-summer-events-roll-out-across-austrias-waidhofenthaya-and-baden-districts

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Cite as: European fish die-offs and wildlife crisis due to heat. CLSTR, https://clstr.news/situations/european-fish-die-offs-due-to-heat-and-water-shortages