MEDFORD, Ore. (AP) - Oregon fish managers are going all-out to eliminate tui chub in Diamond Lake after a single fish of the species was found there.

The Mail Tribune reports that the unwanted tui chub was discovered in October, nine years after the state's $5.6 million effort to eradicate the invasive species.

The Oregon Department of Fish and Wildlife plans to stock as many as 25,000 fish-eating tiger trout in the lake this spring. That will be followed by workers searching for the species day and night.

Tui chub were last discovered in Diamond Lake in 1991. Their population hit 30 million before agency biologists had a plan in place, and it soared to 90 million by 2006. That altered the lake's ecosystem, allowing a massive toxic algae bloom to spread.

Top stories:

Can Flint water crisis happen in Oregon?

Wilsonville mother drowns in Willamette River

Oregon booze tax may change ahead of November ballot

Watch: Trooper accused of breaking motorcyclist's collarbone

Follow us on Facebook for the latest breaking news updates

Watch live or check weather & traffic updates on the go with the KGW News app.