"There are a lot of predators that will eat birds and eggs when they are nesting and they are vulnerable."
He said he did not think their situation with predators was any worse than anywhere else in New Zealand.
"It's very satisfying because you are making a small difference to New Zealand being pest free."
Mr Vincent said they also catch hedgehogs, ferrets, stoats and weasels, and the group has put in 800 man hours.
He said as they get more traps they want to get more people involved.
Group member Steve Webb said he had been part of the Lake Okareka pest control group for about 18 months.
"I wanted to help the community out and wanted to help look after the environment.
"It's great to know you are making a difference."
He said helping support rare bird numbers was the main reason for the pest control.