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Explore Search: Fish Biology

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Topic
Multiple images showing USGS fish passage research

Information to Help Design Better Fishways and Overcome Fish Migration Barriers

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

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

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

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

Activity
Anal fins of mosquitofish

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

Research
WARC scientist sits on a dock on the Red River with a syringe preparing to collect blood from a Grass Carp

Laboratory Investigations with Fish Species to Assist with Implementing Barataria-Terrebonne National Estuary Program’s Ecological Management Action Plans

Event
Willamette River near Corvallis, Oregon

Webinar: Evaluating the Effectiveness of Seasonally Assisted Migration through Fish Rescue Programs

Research
Night sampling of smallmouth bass (Micropterus dolomieu)

Endocrine Disrupting Chemicals and Prevalence of Intersex in Fish Populations in New Jersey

Project
Tagging channel catfish with acoustic transmitters and infesting them with Winged Mapleleaf glochidia

Hydroacoustic mapping for native mussel and host fish habitats using Quadrula fragosa and Ictalurus punctatus

Research
Image shows a fish in a tank beneath a half-circle shelter

Complex Mixtures, Complex Responses—Using Comprehensive Approaches to Assess Pharmaceutical Effects on Fish

Project
small speckled fish in a hand

Response of fish assemblages and habitat to stream restoration in the Ashokan Watershed

Project
Virginia Ecoflows Website Thumbnail Image

River Continuum Concept Ecological Limit Functions for Fish and Benthic Data in Virginia

Project
Tule Perch

Understanding Influences on Habitat Quality for Delta Smelt and Other Imperiled Fish Populations

Project
Sudan Black B dyed Grass Carp

Assessment and methods development of dyed feeds for the evaluation of toxic fish bait consumption

Topic
Fish and estrogenicity sampling locations in the Chesapeake Bay river watersheds

Land-use influences on estrogenic-endocrine disruption in fish within the Chesapeake Bay watershed

Research
Image: Fathead Minnow

Unique Approach to Measure Per- and Polyfluoroalkyl Substances Uptake in Fish, Mussels, and Passive Samplers

Research
USGS scientist pauses during field work in a stream impacted by acidic runoff and metal contamination

Fish Diets Switch From Aquatic to Terrestrial Insects in Streams Effected By Metal Contamination

Event
Lake Michigan near Grand Haven, Michigan

Webinar: Variable Warming in Lakes of the Upper Midwest and Implications for Sport Fish

Research
SS1-Figure 1 Microscopic Appearance

Science Summary—Indicators of Reproductive Endocrine Disruption in Fish in the Chesapeake Bay Watershed

Research
Chesapeake Bay image

Assessing stream health and fish habitat in streams of the Chesapeake Bay Watershed

Project
Analysts determining the effectiveness of long term sedation using AQUI-S® 20E

Evaluation of a method to determine eugenol concentrations in the edible fillet tissue from fish

Project
Tilapia recovering after 8 hours of heavy sedation with AQUI-S® 20E

Method Transfer Study for the Analytical Method to Determine 17-Amethyltestosterone Concentrations in Fish Feed

Project
3 people in a boat on a river - 1 driving 2 holding big fishnets

Contaminants in fish tissues from AOCs in New York State: The Niagara River AOC

Project
Thermal infrared image of Sandhill cranes on the Platte River

Remote Sensing in support of the U.S. Fish and Wildlife Service Migratory Bird Surveys Branch

Research
Measuring the energy content of American shad

Effects of temperature and energy use on fish passage and spawning success of American shad

Research
Field of Little Bluestem

Improving wildlife habitat through management and restoration of native prairies on lands under Fish and Wildlife Service ownership

Research
Largemouth bass at the USFWS Mountain-Prairie Aquarium

Mercury Isotope Ratios used to Determine Sources of Mercury to Fish in Northeast U.S. Streams

Research
Bluegill (Lepomis macrochirus)

Selected Pharmaceuticals Not Likely to Persist in Wild Fish: Results of Uptake and Elimination Testing

Project
small stream running through boulders in green forest

Responses of fish assemblages to changing environmental conditions in the Neversink River and Rondout Creek

Project
a large net in a brown shallow stream lined with green leafed trees

Quantitative Assessment of Water Quality in Upper Esopus Creek: Fish, Macroinvertebrates, Periphyton, Turbidity, and Nutrients

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