The turtle, native to North America, grows to between 12.5 and 28 centimetres and has been named in the top 100 most invasive alien species by the International Union for Conservation of Nature.
Group co-ordinator Penny Lee said members had sighted the turtle on four occasions and were concerned by the lack of action taken by the State Government.
‘I’m surprised; as far as we know there are no colonies in WA. Wouldn’t you attend to it?’ she said.
‘Is it or is it not a serious threat; if it is then why not do something about it?’
‘The red-eared slider turtle is considered a significant environmental threat and it has been found established in the wild in various parts of Australia, where they compete with and predate on native species,’ he said.
Ms Lee said the turtle put stress on any ecosystem that was already heavily under strain from other introduced species.