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Klamath Falls Field Station

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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.

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Page Last Modified: Thursday, 08-Dec-2016 08:27:48 EST