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Explore Search: fish

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Project
Longfin Smelt

Exploring Drivers of Pelagic Fish Population Decline in Bay-Delta

Research
USGS scientist removing the brain from a fish (a white sucker) collected from Fourmile Creek near Ankeny, Iowa

Antidepressants in Stream Waters! Are They in the Fish Too?

Research
Image Collage of Landsat, pollinator, and volcanologist

Effects of sucker gigging on fish populations in Oklahoma scenic rivers

Research
Gizzard shad infected with VHSV

Molecular Characterization of Novel Fish Viruses from Technical Assistance Cases

Project
brown colored stream flowing through green brush with evergreens in background

Mercury Bioaccumulation in Fish in New York's Streams and Rivers

Research
Dr. Kent Crawford lifts a carp caught during a 2015 electro-fishing survey for Smallmouth Bass on the Conodoguinet Creek.

Changing Freshwater Flows Affect Fish Populations in the Potomac River

Project
Rodeo Lagoon, Golden Gate National Recreational Area, California

Role Nutrients Play in Fish Death Rates at Rodeo Lagoon

Project
View from beach through beachgrass of Frankfort Lighthouse, Michigan in Lake Michigan

Understanding the Varying Responses of Fish Populations to Future Climate

Fieldwork
View of from ridgetop with equipment in the foreground and a populated area below

Postfire Landslide Monitoring Station: “Las Lomas” (2016 Fish Fire) near Duarte, California

Project
Scientist stands on water's edge holding a measurement instrument

Baseline assessment of PAH concentrations in fish from the Stillaguamish River, Washington

Project
A staff member holding a spotted gar captured in Oak Orchard Creek

Areas of Concern: 18 Mile Creek AOC - Fish Community Characterizations

Research
Fig. 1. A flow cytometric histogram of larval Grass Carp cells

A Website Tool for Predicting Triploidy in Larval Fish Spawns

science
USGS

Models and baby fish – digits, dye, particles, and biological reality

Project
An Alaskan Sockeye Salmon. USGS photo gallery.

Evaluating the Effectiveness of Assisted Migration and Fish Rescue Programs

Activity
Scientist holding a brook trout with gloved hands

Mercury in Fish from 21 National Parks in the West

Project
Image: Artisanal Fishing in Lao PDR

Global Assessment of River Fish Production and Potential Global Change Implications

Project
near the Sadlerochit River

Assessing State Fish and Wildlife Climate Adaptation Science Needs and Effectiveness

Research
Landsat image of the south end of San Francisco Bay Estuary and associated wetlands

Scientists Identify Processes that Affect Fish Mercury Concentrations in Estuarine Wetlands

Project
Male atlantic salmon showing a kype in lower jaw

Aquatic Native Species and Habitat Restoration: Restoring native freshwater fish populations

Topic
Multiple images showing USGS fish passage research

Information to Help Design Better Fishways and Overcome Fish Migration Barriers

Research
USGS scientist dissecting a fish to determine possible effects from exposure to endocrine disrupting contaminants

Chemical Combo and Intersex Fish Found at Smallmouth Bass Nesting Sites

Project
Measuring streamflow using ADCP, Fish Creek

Characterization of Fish Creek and Evaluation of Nutrient Inputs to Watershed

Research
Elodea spp. on a rake in Sand Lake in Anchorage, Alaska

Effect of Elodea spp. on Fish Performance Mediated Through Food Web Interactions

Project
Eastern Brook Trout

Climate- and Land-Cover-Induced Shifts in the Distribution and Abundance of Invasive Fish and Their Impacts on Native Fish Communities in the Tennessee and Cumberland River Basins

Project
Spawning Reef Restoration for Native Lake Sturegon in St. Clair River

Aquatic Native Species and Habitat Restoration: Custodial Maintenance of Fish Spawning Reefs

Activity
Anal fins of mosquitofish

Synthetic Progestin Affects Fish Reproductive Development and Behavior in Laboratory Exposure Study

Project
Image Collage of Landsat, pollinator, and volcanologist

The Role of Phenotypic Plasticity in the Adaptive Capacity of Midwestern Fish and Wildlife

Research
Image: Endangered Humpback Chub

Assessment of Mercury and Selenium Accumulation in Upper Colorado River Basin Fish

Research
Pacific sand lance in a sieve from a purse seine in Prince William Sound

Condition of Forage Fish in Prince William Sound During the Marine Heatwave

Project
A river of rapids with pebble-ridden banks rushes through a forest of tall, green pines.

Supporting Climate-Resilient Design for In-Stream Restoration and Fish Passage Projects

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