Hundreds of birds, fish, and other wildlife have died across the United Kingdom due to toxic blue-green algae blooms, exacerbated by a nationwide drought. Nearly 250 cases of cyanobacteria, commonly known as blue-green algae, have been reported in waterways, lochs, and lakes from Northern Ireland to Scotland and as far south as Hampshire.
The outbreak has led to distressing scenes at several locations, most notably Canvey Lake in Essex, where dead ducks, geese, moorhens, and fish have been found floating on the surface. The bacteria thrive in still water and multiply rapidly in hot, dry conditions, posing a threat to wildlife and potentially causing illness in vulnerable humans.
At Canvey Lake, bacteria levels have reportedly reached 125 times the safety threshold. A family of swans, including adult birds and nine cygnets, which had become a local attraction, perished in the incident. Residents have expressed anger, with some taking it upon themselves to remove deceased animals due to perceived inaction by local authorities.
Castle Point Borough Council, which manages Canvey Lake, stated that water analysis results did not necessitate changes to current management or treatment plans. However, Dame Rebecca Harris, the Member of Parliament for Castle Point, called for immediate action to protect the lake's wildlife and long-term solutions, emphasizing that residents should not have to witness such scenes.
Blue-green algae is a naturally occurring phenomenon, but prolonged hot weather and drought conditions, such as those currently affecting much of the East of England, are known to accelerate its growth. Similar algal blooms have been reported in standing water bodies across the region.
In response to the situation, the council has posted signs advising the public not to feed waterfowl and to keep dogs on leashes near the water. While the risk to the general public is considered low, contact with the algae can cause irritation and illness.
This is not the first incident of its kind in the area. In 2022, the town council had to relocate over 800 fish following a similar outbreak caused by extreme weather conditions.
Local residents have voiced their devastation. Hayley Cockayne, who has spent significant time observing the swans at Canvey Lake for years, described the situation as heartbreaking. Pen Centavo, of Friends of Canvey Lake, highlighted the shocking state of the water, the presence of decaying carcasses, and the strong smell, noting that the high bacteria levels could affect human health, particularly for vulnerable individuals.