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.

EMA Animal Welfare Assurance Website

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.

Learn More

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.

Find Out More

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

Learn more


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.


Publication Thumbnail
Year Published: 2020

Genomes reveal genetic diversity of Piscine orthoreovirus in farmed and free-ranging salmonids from Canada and USA

Piscine orthoreovirus (PRV-1) is a segmented RNA virus which is commonly found in salmonids in the Atlantic and Pacific Oceans. PRV-1 causes the Heart and Skeletal Muscle Inflammation (HSMI) disease in Atlantic salmon and is associated with several other disease conditions. Previous phylogenetic studies of genome segment 1 (S1) identified four...

Siah, Ahmed; Breyta, B. R.; Warheit, K. I.; Gagne, N; Purcell, Maureen K.; Morrison, Diane B.; Powell, J. F. F.; Johnson, S. C.

Publication Thumbnail
Year Published: 2020

A standard operating procedure for the preparation of purposely killed juvenile salmon used to test survival model assumptions

This document describes a standard operating procedure (SOP) for the preparation of purposely killed juvenile salmon, implanted with telemetry transmitters, to be released into rivers, lakes, or streams to test one of the survival model assumptions. Procedures for releases of purposely killed fish (hereinafter dead fish releases) were developed by...

Tomka, Ryan G.; Liedtke, Theresa L.; Frost, Conrad; Smith, Collin D.
Tomka, R.G., Liedtke, T.L., Frost, C., and Smith, C.D., 2020, A standard operating procedure for the preparation of purposely killed juvenile salmon used to test survival model assumptions: U.S. Geological Survey Open-File Report 2020–1083, 11 p.,

Publication Thumbnail
Year Published: 2020

Genomic architecture and repertoire of the rainbow trout immunoglobulin light chain genes

The genomic loci encoding the four immunoglobulin light chains (IgL1, IgL2, IgL3, and IgL4) in the Swanson trout genome assembly were annotated in order to provide a measurement of the potential IgL repertoire. IgL1 and IgL3 gene segments are co-localized on chromosomes 21, 18, 15, and 7 while IgL2 and IgL4 were found on chromosomes 13 and 17,...

Rego, Katherine; Hansen, John; Bromage, Erin S