Colorado Parks and Wildlife officials are dealing with an infestation of 4,000 goldfish in a lake in Boulder County, Colorado, according to various reports.

It is believed that someone dumped a handful of pet goldfish into Teller Lake a few years ago.

The goldfish-infested waters of Teller Lake near Boulder. Colorado Parks and Wildlife Since the goldfish are a nonnative species in the area, park officials are concerned that these fragile, harmless fish will threaten the natural aquatic ecosystem.

Goldfish in Teller Lake. Screen grab KMGH "It's a bad thing — it's a really bad thing," Colorado Parks and Wildlife spokesman Jennifer Churchill told Fox 31 News. "They'll start eating up everything that the native fish, and the amphibians, and the birds are here to eat, and so that can have a really negative effect down the road — and this can kill this fishery in a few years."

The goldfish in Teller Lake are growing rapidly from their 2-inch frames.

In 2013, scientists at Lake Tahoe captured a massive goldfish measuring almost 2 feet long and weighing in at 4.2 pounds.

According to the BBC, "Goldie" was the largest documented pet goldfish measuring 15 inches and weighing more than 2 pounds.

There are a few options: Drain the entire 12-acre lake and rebuild the fish population, temporarily electroshock the fish and capture them while they are paralyzed, or kill the goldfish.

The Colorado Parks and Wildlife department does not have an immediate timetable for removing the fish, NBC 9 News reported.