Masterton District Council is warning of likely avian botulism causing the death of birds and eels at Henley Lake.

Dogs should be kept on leads, with a number of dead birds removed in recent days, and several eels also affected.

The risk to human health is low, but pets such as dogs and cats can become sick if they eat infected carcasses. Dead eels or other fish should not be eaten.

Avian botulism is endemic in New Zealand, with outbreaks in several areas recently. It causes paralysis and often death in birds when the bacterium Clostridium botulinum becomes toxic with a combination of warm temperatures, low water levels, and poor water quality.

Council contractors are removing dead and affected birds and fish, and warning signs will be erected.

The Council’s Facilities and Open Spaces Manager Ian Osland said the presence of avian botulism should not cause alarm, but care was required.

“Avian botulism is a naturally occurring bird disease triggered by environmental conditions,” he said.

“We will be endeavouring to ensure dead and affected animals are removed as quickly as possible.

“Care should be taken, particularly with dogs, so we are encouraging owners to keep their dogs on leash at Henley Lake.”

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