Images

Photograph of the Sanpoil River in northeast Washington State.  The Sanpoil River is upstream of Grand Coulee and is a tributary of the Columbia River.

Researchers placed a juvenile native char into a viewing box to help identify the species. This fish was collected as a part of a food web study on Ross and Diablo Lakes in Washington State in order to evaluate fish growth and limitations to production.

Evening shot of Ross Lake with boat wake.  Heading back to camp after a day of research. Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state. This photo was taken while conducting food web research to support the Skagit River Hydroelectric Dam FERC relicensing process.

The Elwha River flows through the footprint of the former reservoir Lake Mills. The wide-angle image also shows revegetated uplands dominated by alder trees meeting coniferous forest along the former shoreline of the reservoir.

Stakeholder interests have spurred the reintroduction of the critically endangered populations of Chinook Salmon to tributaries upstream of Shasta Dam, in northern California. We released two groups of acoustically tagged, juvenile hatchery, late-fall Chinook Salmon to determine how juvenile salmon would distribute and survive.

Researchers on their way to sampling site on Diablo Lake. Diablo Lake is a reservoir in the North Cascade mountains of northern Washington. Created by Diablo Dam, the lake is located between Ross Lake and Gorge Lake on the Skagit River.

USGS researchers from the Western Fisheries Research Center, Columbia River Research Laboratory and the Oregon Water Science Center recently completed a study that reviewed existing fisheries datasets and provided an overview of research approaches for estimating habitat availability and carrying capacity of Pacific salmon in the Willamette River Basin.

Fish biologist Carolyn Malecha with the Klamath Falls Field Station catches adult suckers as part of a long-term monitoring program that estimates survival and recruitment of suckers.

Juga sp. snails, the molluscan intermediate host for Nanophyetus salmincola, populate the bottom of a stream bed in a south Puget Sound watershed.

Flushing stomach contents from a live resident Chinook salmon for an investigation of cannibalism and predation impacts.

Gills from Lost River suckers with a heavy infestation of Ichthyobodo sp. (arrows).  Slide is stained with hematoxylin and eosin.

Herring (top) and juvenile Chinook salmon (bottom) flushed from the stomach of a resident Chinook salmon in Puget Sound.

Nested polymerase chain reaction (nPCR) for the detection of Renibacterium salmoninarum. Agarose gel electrophoresis is used for size separation and visualization of amplified DNA sequences.

Lost River suckers congregating to spawn on Sucker Springs in Upper Klamath Lake, Oregon.

Nested polymerase chain reaction (nPCR) for the detection of Renibacterium salmoninarum. Agarose gel electrophoresis is used for size separation and visualization of amplified DNA sequences.

Nested polymerase chain reaction (nPCR) for the detection of Renibacterium salmoninarum. Following two rounds of PCR amplification, samples are pipetted into an agarose gel for electrophoresis.

Sampling Striped Bass for diet items in the San Francisco Estuary.

Spread plate procedure for quantitative culture Renibacterium salmoninarum from fish tissue or ovarian fluid.

Passive Integrated Transponder (PIT) tag detection station on Willow Creek, California. Systems like this one are used to detect movements of endangered Lost River and shortnose suckers in remote locations.

Tissue sections are mounted on glass slides, stained and examined with a microscope that magnifies cellular details up to 2,000 times with brightfield or fluorescence imaging. Microscopes are used in our research to understand the pathological changes caused by infectious agents such as bacteria, fungi, parasites and viruses.

Quantitative Polymerase Chain Reaction (qPCR) assay for the detection of Renibacterium salmoninarum DNA. A nucleic acid sequence detection system is shown.