Gold Fish In Lake Tahoe?

From the Sacramento Bee: A new species is lurking in the waters of Lake Tahoe: the beloved goldfish.
The warm water fish, commonly raised as pets, are invading the pristine lake, taking food and space from native species. And, they're also growing to be quite large.
"They didn't have any predators, so they were able to grow up to 14 inches and four pounds," said Kevin Thomas, an environmental scientist at the California Department of Fish and Wildlife.
Researchers and environmentalists say the trend is not new. Local residents have long reported sightings of the gigantic, bright orange creatures.
"It's not atypical for a strain of goldfish to get to a larger size," said Christine Ngai, a researcher at the University of Nevada, Reno. "They are like humans; some are taller or shorter."
The fish were likely dumped into the lake or used as bait. Like other warm water species, goldfish typically live in shallow areas, close to the shore.  http://www.sacbee.com/2013/02/22/5210314/goldfish-growing-thriving-in-lake.html
I just wonder how many Goldfish are living in other lakes like Lake Mead and other lakes in the country.

I also wonder how they taste.