Oxygen depletion causes fish fatalities within Kastell Trench
In the heart of Münster, Germany, a tragic event has unfolded in the city's moat at the promenade. Around 100 fish, including smaller pikes, perch, and roach, have succumbed to very low oxygen levels, a consequence of extreme weather conditions and the need for improved long-term maintenance of stillwaters.
The city administration has been closely monitoring the situation, issuing a general decree on July 11 that prohibits the withdrawal of water from rivers, streams, and lakes within the city area. This measure is aimed at conserving what little water remains and helping to maintain oxygen levels.
The oxygen depletion and subsequent fish deaths are believed to be due to the persistent drought and high temperatures, which have led to falling water levels and oxygen depletion in the still water. Hydrogen sulfide, a toxic gas for fish, has also been released from the sediment due to oxygen deficiency.
Aerators cannot be used in the moat due to its shallow depth and the potential to stir up sediment and further increase oxygen consumption. The city administration hopes that the situation will improve with the next rainfall.
The moat was dredged in 2022, but long-term maintenance is needed to secure its ecological function and better prepare for extreme weather conditions. Many waters in the city are currently stressed due to the weather, with some ponds dried up and others suffering from oxygen depletion.
The city is also monitoring other stillwaters to prevent similar incidents. Employees of the Office for Green Spaces, Environment and Sustainability have been removing the dead fish since Monday, August 25. There is no danger to humans and pets at the moat, only potential odor nuisances.
It's important to note that a similar incident occurred in Lehi, Utah, on August 25, 2022, where a significant fish kill occurred in a city pond due to low oxygen levels and high temperatures.
The city of Münster remains vigilant in its efforts to protect and preserve its water resources, recognising the importance of these ecosystems for the city's biodiversity and overall health.
Read also:
- Understanding Hemorrhagic Gastroenteritis: Key Facts
- Stopping Osteoporosis Treatment: Timeline Considerations
- Tobacco industry's suggested changes on a legislative modification are disregarded by health journalists
- Expanded Community Health Involvement by CK Birla Hospitals, Jaipur, Maintained Through Consistent Outreach Programs Across Rajasthan
