Freed goldfish can grow to the size of a football and contribute to poor water quality by uprooting plants and disturbing the sediment at the bottom of ponds and lakes.
Mandatory Credit: City of Burnsville
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Invasive, football-size goldfish found in a Minnesota lake
The tiny goldfish you can pick up at pet store for a few cents might not look like an environmental threat, but they can grow into a huge problem if set free in lakes or ponds -- mainly because they can grow to be surprisingly huge.
