Fisheries Program


Our fisheries researchers are world-class scientists. They conduct cutting-edge research to provide fisheries resource managers the scientific information they need to protect, restore, and enhance our Nation’s fisheries and their habitats.

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Imperiled Species Research

Imperiled Species Research

Forty percent of all fish species in North America are at risk of extinction. USGS research is crucial to protect and manage at-risk species and healthy fish populations into the future.

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Drought and Ecological Flows

Drought and Ecological Flows

As part of the USGS Fisheries program, ecological flows, or the relationships between quality, quantity, and timing of water flows and ecological response of aquatic biota and ecosystems; and related ecosystem services are being investigated.

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Fisheries Research

USGS scientists study life history, population ecology, and conservation and restoration strategies for aquatic species and the habitats that sustain them.

Aquatic Habitats

Aquatic Species

Aquatic Ecosystem Conservation

Advanced Tools and Technologies

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Date published: March 13, 2017

Water managers explore new strategies to protect fish in California’s Bay Delta

The water in the Delta arrives primarily from the Sacramento and San Joaquin Rivers, supplying water for more than 22 million people. This water source supports California’s trillion-dollar economy—the sixth largest in the world—and its $27 billion agricultural industry.

Date published: November 16, 2016

USGS Study Reveals Interactive Effects of Climate Change, Invasive Species on Native Fish

A new USGS study shows non-native Brown Trout can place a burden on native Brook Trout under the increased water temperatures climate change can cause.


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Year Published: 2020

Fish assemblages in eelgrass beds of Bellingham Bay, Washington, Northern Puget Sound, 2019

Puget Sound is a critical part of the Pacific Northwest, both culturally and economically. Eelgrass beds are an important feature of Puget Sound and are known to influence fish assemblages. As part of a larger site-characterization effort, and to gain a better understanding of the fish assemblages in Bellingham Bay, Washington, four eelgrass beds...

Andrews, Morgan I.; Liedtke, Theresa L.
Andrews, M.I., and Liedtke, T.L., 2020, Fish assemblages in eelgrass beds of Bellingham Bay, Washington, Northern Puget Sound, 2019: U.S. Geological Survey Data Series 1131, 11 p.,

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Year Published: 2020

Shifting food web structure during dam removal—Disturbance and recovery during a major restoration action

We measured food availability and diet composition of juvenile salmonids over multiple years and seasons before and during the world’s largest dam removal on the Elwha River, Washington State. We conducted these measurements over three sediment-impacted sections (the estuary and two sections of the river downstream of each dam) and compared these...

Morley, Sarah A.; Foley, Melissa M; Duda, Jeffrey J.; Beirne, Mathew M; Paradis, Rebecca L; Johnson, Rachelle Carina; McHenry, Michael L.; Elofson, Mel; Sampson, Earnest M; McCoy, Randall E; Stapleton, Justin; Pess, George R.

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Year Published: 2020

Disease in Central Valley salmon: Status and lessons from other systems

Chinook Salmon (Oncorhynchus tshawytscha) are increasingly vulnerable to anthropogenic activities and climate change, especially at their most southern species range in California’s Central Valley. There is considerable interest in understanding stressors that contribute to population decline and in identifying management actions that reduce the...

Lehman, Brendan M; Johnson, Rachel C.; Adkison, Mark; Burgess, Oliver T; Connon, Richard E; Fangue, Nann A.; Foott, Scott J; Hallett, Sascha L; Martínez-López, Beatriz; Miller, Kristina M.; Purcell, Maureen K.; Som, Nicholas A.; Valdes-Donoso, Pablo; Collins, Alison L