Overview
The Northern Pikeminnow (Ptychocheilus oregonensis), formerly known as the Columbia River Squawfish, is a massive, voracious predatory minnow native to the sprawling river basins of the Pacific Northwest. While most people think of minnows as tiny baitfish, this formidable apex predator grows up to three feet long, wielding a long, toothless pike-like snout and specialized pharyngeal throat teeth designed to swallow juvenile salmon and trout whole.
Biology and Physical Characteristics
Ptychocheilus oregonensis has an elongated, slender body with a long, flattened, pike-shaped head and a deeply cleft horizontal mouth extending back past its eyes. Its dorsal coloration is dark greenish-grey to olive-brown, shading into gleaming silvery sides and a creamy belly, accented by bright yellowish-orange pectoral, pelvic, and anal fins during spring spawning.
Behavior and Ecology
An aggressive, schooling piscivore, the Northern Pikeminnow thrives in the slow-moving reservoir pools created by hydroelectric dams along the Columbia and Snake rivers. Positioning themselves in dam tailraces and bypass flumes, large pikeminnows ambush disoriented juvenile salmon and steelhead smolts migrating toward the Pacific Ocean, consuming millions of young salmonids annually.
Conservation and Human Impact
Assessed as Least Concern by the IUCN, the species is native, abundant, and ecologically thriving. Because dam construction created artificially ideal hunting conditions for pikeminnows at the expense of endangered salmon, state fish agencies operate the famed ‘Sport Reward Program,’ paying recreational anglers a bounty for each pikeminnow caught to balance river salmon survival.
Interesting Factoid
The Northern Pikeminnow shatters the stereotype that minnows are small: as a member of the minnow family (Leuciscidae), this torpedo-shaped predator can grow over 30 inches long and weigh 14 pounds, rivaling small pike in size.