BURNSVILLE (AP) -- Officials in a Twin Cities suburb say they're finding more giant goldfish in local waterways, prompting a plea to citizens to stop dumping their unwanted fish into ponds and lakes, which is illegal in Minnesota.

The goldfish, which grow to the size of a football, compete with native species for food and increase algae in lakes. Burnsville officials found 10 fish in Keller Lake earlier this month while doing a water quality survey.

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On Monday, 18 additional fish were found. Some were 18 inches long and weighed about 4 pounds.

Burnsville officials have worked with Carp Solutions, a startup company that develops new technologies for controlling carp, a larger cousin of goldfish.