A city in the US state of Minnesota has urged residents not to release their unwanted pet fish into the wild after finding huge goldfish in a lake.
The common household pets can grow far bigger in the wild and cause major disruption to ecosystems.
The city of Burnsville shared images showing several monster goldfish caught during a survey of Keller Lake.
It said goldfish could contribute to poor water quality by disturbing sediment and uprooting plants.
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