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Boat tied to a dock on a lake

Carp Solutions, which specializes in controlling water pests, is helping investigate how goldfish are harming aquatic ecosystems.

The problem has been getting worse in recent years, said Przemek Bajer, who owns Carp Solutions and is an aquatic invasive species professor at the University of Minnesota. The most probable sources are former pets and their progeny, he said.

“They seem to be getting more and more widespread,” Bajer said. “You think about how many of those fish are sold nationally and how many are being released. That’s a pretty big vector of introduction.”

Read the full story in the Washington Post.