Bird deaths were 'natural'

The recent birdlife deaths within the Pearl Beach Lagoon were caused by a naturally occurring avian disease, according to Gosford Council's manager of education and compliance Mr John Parkes.

Mr Parks said that, following reports from community members that a number of birds had been found dead, council investigated the matter and discovered the affected birds demonstrated clinical signs of disease known as avian botulism.

He said botulism was caused by a bacterium called clostridium botulinum, a naturally occurring organism that lives in lakes and ponds, especially in and around decaying vegetation.

"Outbreaks often occur when there is a combination of low water levels, warm temperatures and lack of oxygen in the water," Mr Parkes said.

"The most effective control once an outbreak has been identified is to remove dead birds to prevent the build-up of the toxin.

"Council's environment officers have reported the matter to the regional veterinary officer within the Department of Industry and Investment NSW and we have followed advice from the department which includes the appropriate removal of dead birds from the site to prevent the spread of the disease to other birds."

The disease is not lethal to humans and pets, according to Mr Parkes.

"The type of avian botulism which is affecting wild birds in the Pearl Beach Lagoon has not been associated with disease in humans and pets (such as cats and dogs)," Mr Parkes said.

"Environment officers have undertaken a water quality test and results indicate that the water quality within the lagoon is satisfactory.

"Council's environment officers will continue to monitor the situation and we will do everything we can to inhibit the spread of the disease."

Should residents notice dead birds in the area, they are encouraged to contact council on 4325 8222 to arrange for collection and appropriate disposal.

Press release, 13 Jan 2010 John Parkes, Gosford Council