[5] The Rogue River introduction has two possible sources: 1) in 1994 a flood breached the north Rogue drainage divide, causing pikeminnow to escape through the Cow Creek system,[6] or 2) in 1978 through an unscreened farm pond on Wolf Creek.

[7] The fish inhabit the pools or sluggish runs of small rivers and creeks,[2] usually found in waters less than 1 m deep.

[9] Adult Umpqua pikeminnow predate on salmon, steelhead, and trout while juvenile individuals compete with these native fish for the same resources.

The evolutionary history of the Ptychocheilus genus was never well understood, and many studies disputed where the Umpqua pikeminnow should be placed.

[16] Because of this, some studies have been conducted to find a way to control Umpqua pikeminnow populations without causing nearly as much damage to the desired fish species.