Fish
Northern Hogsucker
Hypentelium nigricans · also called hog molly
Along a gravelly riffle in a clean, fast-flowing stream, a northern hogsucker roots methodically beneath a loose rock, and within moments a handful of smaller fish drift in behind it, ready to snap up whatever the hogsucker’s own feeding has just shaken loose.
Overview
The northern hogsucker, Hypentelium nigricans, is a bottom-feeding fish native to clean, gravelly streams across a broad range of the eastern and central United States and adjacent Canada. Its distinctive hog-like rooting snout and sensitivity to pollution make it one of the more physically distinctive and ecologically valuable indicator fish in North American streams.
A feeder that accidentally sets the table for others
A northern hogsucker’s rooting through gravel isn’t just feeding for itself, it’s an activity that reliably uncovers food other fish are perfectly happy to take advantage of, turning one species’ meal into an opportunity for several more.
Status
Least Concern — widespread and stable across suitable clean, gravelly stream habitat throughout the eastern and central United States.
Northern Hogsucker: common questions
Why does the northern hogsucker have such an unusual snout?
A northern hogsucker has a distinctive downturned, fleshy, hog-like snout that it uses to root along stream-bottom gravel and overturn small rocks while feeding, an adaptation that lets it access aquatic insect larvae and other invertebrates hidden beneath the substrate.
Why do other fish sometimes follow a feeding hogsucker?
Because a feeding northern hogsucker stirs up invertebrates that were previously hidden safely under rocks, other fish species sometimes follow closely behind it, taking advantage of the prey exposed by the hogsucker's own rooting activity rather than having to dig it out themselves.
Why is the northern hogsucker considered a good sign of stream health?
The northern hogsucker is sensitive to water pollution and sedimentation, meaning a healthy population found in a given stream can serve as a useful, easily observed indicator of good overall water quality, since the species tends to decline or disappear from streams affected by degraded conditions.
Where does the northern hogsucker live?
The northern hogsucker is native to clean, gravelly streams across a broad range of the eastern and central United States and adjacent Canada, generally favouring fast-flowing riffles within cool, well-oxygenated water.