USGS - science for a changing world

Western Fisheries Research Center

Home About Us Field Stations Lead Scientists Research Projects Species Studied Publications Research Resources

Outreach Partners Tribal

Klamath Falls Field Station

Station Home | About Us | Scientific and Taxonomic Emphases | Research | Species Studied | Upper Klamath Lake Water Quality | Tribal Relations | Publications | Partnerships | Staff | Directions

Species Studied

Klamath largescale sucker (Catostomus snyderi)

Klamath largescale suckers are catostomids endemic to the Upper Klamath River Basin in Oregon and California. The largest adult females can grow to 575 mm fork length. In contrast to Lost River and shortnose suckers, Klamath largescale suckers are primarily resident in rivers and large streams. The population of Klamath largescale suckers in the primary tributaries to Upper Klamath Lake (the Williamson and Sprague Rivers) spawns farther upstream and earlier in the spring than the other two species (March and April). The Klamath largescale sucker shares a complex evolutionary genetic heritage with the other two sucker species, particularly the shortnose sucker. Although most adults are morphologically distinct from shortnose sucker adults, hybrids do occur and genetic techniques indicate broad overlap in genotypes between these two species. Aside from the most basic life history information, little is known about Klamath largescale suckers.

More information about Klamath largescale suckers is available from the U.S. Fish & Wildlife Service as a Species of Concern under the Endangered Species Program.

Photo of Klamath Largescale Sucker

Adult Klamath largescale sucker. Photograph by U.S. Geological Survey.

Some of the links provided on this page may be presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Debra Becker
Page Last Modified: Thursday, 08-Dec-2016 08:27:48 EST