Most likely escapees from a fish farm, or worse, introduced intentionally.
These three tilapia species were introduced into Australia through the aquarium trade. They are extremely hardy fish with highly efficient breeding strategies (including mouthbrooding), simple food requirements and flexible habitat preferences.
PETER McCUTCHEON: Tilapia were illegally imported into Australia as aquarium fish more than 25 years ago and were soon introduced into north Queensland dams as a way of controlling weeds and mosquitoes. The infestation has slowly but surely spread by human hand as people either deliberately or unwittingly introduced these fast breeding pests into a series of tropical waterways like Townsville's Ross River.
First found in Carnarvon in 1981, tilapias probably came as ornamental fish and escaped or were released.
they were intentionally introduced into waterways to declare war on a non-native aquatic beetle or some other aquatic bug that was also intentionally introduced to declare war on non-native aquatic plants that were unintentionally introduced into waterways, choking out native aquatic flora and declared noxious.
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