Images

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.

Quantitative polymerase chain reaction (qPCR) assay for the detection of Renibacterium salmoninarum DNA. Observation of qPCR results on the screen of a sequence detection system.

Hells Canyon on the Snake River.

Direct fluorescent antibody test (DFAT) for the detection of Renibacterium salmoninarum in tissues. Fluorescing R. salmoninarum cells are visible on a slide.

The Cle Elum River, a tributary of the Yakima River in Washington state. Sockeye salmon reintroduction efforts were initiated in the Cle Elum River by the Yakama Nation and Washington Department of Fish and Wildlife in 2009.

Sockeye salmon preparing to spawn upstream of Cle Elum Dam, Washington.

As blooms of cyanobacteria die on the water surface of Upper Klamath Lake they turn blue-green.

USGS studies the behavior and health of juvenile endangered Lost River and shortnose suckers within in-lake mesocosms in Upper Klamath Lake, Oregon.

Shoreline traps in Lookout Point Reservoir, Oregon.

Juvenile Chinook salmon on the Middle Fork Willamette River, Oregon.

Aerial image of an oil tanker in Prince William Sound, Alaska.

Oil Tanker in Prince William Sound.

Klamath Falls Field Station staff maintain remote Passive Integrated Transponder (PIT) detection system on Upper Klamath Lake, Oregon.

Clearing snow from solar panels which provide power to an instream Passive Integrated Transponder tag detection system in the Wind River, WA. The system detects tagged juvenile and adult Steelhead for population assessment and migratory data.

Sam Doak (center) and scientists from the Confederated Tribes and Bands of the Yakama Nation set up block nets to perform population estimates of fish in a pool on Rock Creek, WA. 

USGS scientists Jonathan Warrick and Jeff Duda receiving Riverprize recognition in New Delhi, India. Image courtesy of International Riverfoundation.

Aerial photograph of the mouth of the Elwha River showing sediment deposits from dam removal. Aerial assistance by LightHawk and plane piloted by Dr. Milton Bennett.