Hundreds of fish are believed to have perished in a lake at Calderstones Park, Liverpool, over the past few days, as the UK experiences a sustained period of high temperatures. Anglers visiting the popular city park estimate that up to 400 fish, including a carp thought to be around 30 years old, have been recovered from the water, with oxygen depletion linked to extensive algae growth being cited as the primary cause.
Josh Edwards, a local angler, expressed his frustration, stating that he believes the council "doesn't have a clue" about managing the lake during heatwaves. He explained that algae flourishes in warm water, consuming vital oxygen, particularly impacting bottom-feeding species like carp. Edwards highlighted a recurring pattern, noting that such incidents happen frequently during hot spells, with aerators often introduced only after fish deaths have already occurred, rendering the efforts ineffective.
A spokesperson for Liverpool City Council acknowledged the challenges posed by the current weather conditions. They stated that during periods of hot, dry weather, oxygen levels in bodies of water can significantly decrease. In response, the council's lakes team investigated local watercourses and deployed mobile aerators in the Calderstones Park lake. These devices are designed to introduce more oxygen into the water and improve its overall quality.
However, Edwards maintained that while the council's intention to use aerators was positive, their timing was misjudged. He described the deployment as "too late," suggesting that preventative measures or earlier intervention might have averted the widespread fish deaths. The incident underscores the vulnerability of urban ecosystems to extreme weather events, which are becoming more frequent and intense.
The current heatwave has seen temperatures across the UK soar. Met Office data indicates that Merseyside has experienced several days exceeding 28°C, with minimal rainfall and light winds of around 5-10 mph. Warnings for high temperatures remain in place for parts of England and Wales, with further hot conditions expected in the coming days. Similar incidents of aquatic life being affected by reduced oxygen levels due to heat have been reported in other regions, highlighting a broader environmental concern.