Gambusia were first introduced into Australia from North America as a biological control for mosquitoes; however, this was unsuccessful.
Instead, they have had a detrimental effect on native fish through competition for resources and their aggressive behaviour. They have a habit of nipping the fins of other fish, regardless of size differences. They also prey on the eggs and larvae of native fish and frogs.
Gambusia is a restricted noxious fish under the Biosecurity Act 2014.
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