A pollution incident in a river located in South London has resulted in the death of a significant number of fish over the recent weekend, although the specific cause remains undetermined. The Environment Agency, alongside Thames Water, is currently conducting an investigation into a 3km stretch of the River Pool in Bromley, following reports of deceased fish in Cator Park, Beckenham, which were received on Sunday afternoon.
Environment and fisheries officers from the Agency responded promptly to the reports, confirming the fish fatalities and the pollution incident on the same day. They returned on Monday to continue their investigation. An email from the Environment Agency revealed that “large numbers of European eels, a species of conservation significance, have been killed, along with substantial numbers of smaller fish such as sticklebacks, gudgeon, and stone loach. Additionally, some larger coarse fish, including chub, roach, and dace, have also perished.”
Concerns for Endangered Species
The European eel is classified as critically endangered by the International Union for Conservation of Nature, with juvenile populations, known as glass eels, having decreased by as much as 95 per cent since the 1980s. Once a common catch in the River Thames, the species was traditionally used in dishes such as eel pies and jellied eels.
The polluted area of the River Pool stretches from Cator Park down to the confluence with the River Ravensbourne, covering approximately 3km. Currently, the incident has not affected public drinking water supplies; however, the Environment Agency has advised the public and their pets to avoid the contaminated stretch of river. Continuously monitoring the water quality, the agency’s officers are collecting samples and evaluating the risk of further fish mortality, while the fisheries team is assessing the overall impact on aquatic life.
Investigation Underway
Thames Water, responsible for the local drainage network, is “urgently investigating” the pollution event, although the source remains unknown. To alleviate further adverse effects, the company has implemented aeration measures at critical points along the River Pool to enhance dissolved oxygen levels.
A spokesperson for Thames Water stated, “We are aware of a pollution issue that has affected wildlife in the River Pool and are urgently investigating the cause in collaboration with the Environment Agency. Tests are currently being conducted to identify the pollution source. Thames Water takes its responsibility to monitor and maintain its wastewater network seriously and appreciates the concerns of local residents.”
Community Response and Biodiversity Concerns
Councillor Steven Jefferies, representing Beckenham Town and Copers Cope, expressed gratitude towards the Environment Agency for their prompt response to this “tragic incident” in Cator Park. He remarked, “Beckenham’s rivers are essential for supporting the biodiversity of our area and provide significant benefits to the health and wellbeing of our community. My colleagues and I in the Liberal Democrats on Bromley Council will persist in urging the relevant authorities to ensure that our parks and local wildlife receive the protection they rightfully deserve.”

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