I have a few water features in the garden. 3 of them, including an old bath and smaller size ponds have gambusia. I would like to eradicate them humanely by buying fish that will eat them.... All. Then i would like to get some native fish. I also have frogs and when they lay eggs in the ponds with gambusia, i note that the gambusia chew the tails off the tadpoles ☹️
I live in Sydney. Thanks for any advice.