A BUILD up of toxic algae in a Canvey lake has killed more than 100 fish and forced dog walkers and fishermen to keep clear.

The blue green algae, which has clearly risen to the top of the lake, off Smallgains Avenue, is potentially dangerous - making both humans and animals seriously ill.

Residents have complained about the smell caused by the algae, which has been compared to rotting plants.

Carole Sach, Canvey Independent Party councillor for the island’s East ward, lives in Gwendalen Avenue - close to Smallgains lake.

She said: “The problem was reported by councillor Peter Greig while he was walking his dog on Tuesday and it is being dealt with by the council right now.

“Members of the public have said it is starting to smell, I could smell it too and all the fish have died.”

Mrs Sach added that she has seen the lake “bubbling” with the algae.

The Echo told last summer how the blue green algae killed more than 100 fish. A type of bacteria, the algae grows in sunlight.

Dave Blackwell, leader of the Canvey Independent Party, said: “We have had this blue algae every year for the past three years. There is not much we can do about it but work is being done to stop people and dogs from being affected by the toxic algae in the lake.

“No fishing is allowed in the lake and of course the poor old fish are going to suffer from the build up.”

Signs have been put up around the lake by Castle Point Council warning members of the public to stay away.

Alan Acott, Canvey Independent Party councillor for the island’s East ward, added: “On Tuesday there were fences put up.

“People should make sure there is no water on their hands or anywhere else as they will get an upset stomach.”

The blue green algae starves the water of oxygen, causing fish to die of suffocation.

The algae can cause rashes if it touches skin and illness if swallowed. It can kill dogs.

Fishing restrictions were put in place in Smallgains Lake in 2013.

An Environment Agency spokesman said: “Keep pets and children away from the water and avoid skin contact with the water or algae.”