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The cisco was a 3-year-old female and Koel said tests determined it was born in the lake, meaning it has parents and probably “thousands of siblings.”

Since the discovery of the ciscos, Koel said scientists have been working to find more by netting them and through environmental DNA sampling.

Koel said the lake trout population has declined more than 80% because of officials’ efforts but now they have to worry about a completely different invasive species.

Yellowstone fisheries biologist Todd Koel said they first discovered a small cisco fish, native to the Great Lakes, two years ago, the Post Register reported.

“This is not a good discovery at all,” Koel said.