Contaminant Biology

Fishing and Hunting

Filter Total Items: 16
Date published: November 18, 2019
Status: Completed

Prevalence of Malignant Melanoma in Brown Bullhead from Lake Memphremagog Greater than Expected—Linkages to Contaminant Exposure and Implications for Fish Population Health are Currently Unknown

Raised black lesions observed in 30 percent of the brown bullhead collected from two sites in Lake Memphremagog from 2014 through 2017 were identified microscopically as malignant melanoma. Malignant melanoma in freshwater fishes has been reported before, but this cancer occurrence cluster is raising questions about the cause of the tumors and the implications for the long-term health of fish...

Contacts: Vicki S Blazer
Date published: October 11, 2019
Status: Completed

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

Mercury isotope analyses were used to distinguish different sources of mercury to fish in 23 streams along a forested-rural to urban-industrial land-use gradient in the Northeastern United States. The use of mercury isotope measurements in fish tissue allow for distinguishing different sources of mercury that are bioaccumulating into the food web. Mercury isotope signatures in fish in forested...

Date published: October 3, 2019
Status: Completed

Intersex in Male Smallmouth Bass in the Missisquoi River in Vermont: Understanding Factors that Can Lead to Endocrine Disruption in Field Settings

The presence of testicular oocytes (intersex) in male smallmouth bass (Micropterus dolomieu) in the Missisquoi River in Vermont varied over the period of the study and was not related to concentrations of known endocrine disrupting chemicals in the River. Although previous studies have shown linkages between endocrine disrupting chemical exposures and intersex in fish, these results...

Date published: September 26, 2018
Status: Active

Can There be Unintended Benefits when Wastewater Treatment Infrastructure is Upgraded?

Science from the U.S. Geological Survey (USGS) and other entities has shown that a mixture of natural and synthetic estrogens and other similar chemicals are discharged from wastewater treatment plants (WWTPs) to streams and rivers.

USGS and University of Colorado hydrologists, chemists, geologists, and biologists studied the chemistry and biology of Boulder Creek downstream of Boulder ...

Date published: September 24, 2018
Status: Active

Are Tumors in Wild Fish Harvested in the Great Lakes Region Related to Contaminants in Water Resources?

Our specialized teams of scientists are working in our laboratories and at field sites around the Great Lakes in collaboration with other federal and state resource agencies to document the prevalence of skin and liver tumors in fish. Tumor prevalence in white suckers (Catostomus commersonii), a fish harvested as a food source by local communities, is related to the degree of urbanization in...

Date published: September 11, 2018
Status: Active

Immunomodulation Science Team

The Immunomodulation Integrated Science Team focuses on contaminant and pathogen exposures in the environment that might influence the immune systems of wildlife, livestock, and companion animals. In collaboration with public-health officials, the Team also addresses potential human-health risks stemming from similar exposures.  If actual risks are identified, this Team will inform...

Date published: August 29, 2018
Status: Active

Photomicroscopy and Flow Cytometry — Lafayette, Louisiana

About the Research

The Environmental Health Program collaborates with microbiologists at the Photomicroscopy and Flow Cytometry Laboratory to develop and apply biomarkers to evaluate the potential impacts of environmental contaminants at the cellular and molecular levels. Because molecular and biochemical responses of cells are preceded by chemical changes in nuclei,...

Date published: August 29, 2018
Status: Active

Functional and Molecular Bioassays

About the Research

The Environmental Health Program collaborates with scientists srom the Functional and Molecular Bioassay Laboratory to apply and modify microbial and eukaryotic reporter bioassays to detect the presence of bioactive chemicals in environmental water samples. These analyses compliment analytical chemistry and biological datasets. The laboratory adapts...

Date published: August 29, 2018
Status: Active

Environmental Chemistry — Columbia, Missouri

About the Research

The Environmental Health Program collaborates with scientists at the Environmental Chemistry Laboratory at the Columbia Environmental Research Center, Missouri, develops and applies innovative methods of sampling and analysis to answer critical questions about the occurrence, distribution, fate and transport, and biological exposure of chemical in all...

Date published: August 28, 2018
Status: Active

Organic Chemistry Research — Sacramento, California

About the Research

The Environmental Health Program collaborates with chemists and hydrologists at the Organic Chemistry Research Laboratory (OCRL) to develop targeted analytical methods for the quantitation of chemicals that can impact the health of organisms and humans. The scientists have developed methods in a wide variety of environmental media; in addition to...

Date published: August 23, 2018
Status: Active

Fishing and Hunting Science Team

The Fishing and Hunting integrated science team focuses on contaminant and pathogen exposures in the environment that could impact the presence and vitality of fish and wildlife populations that drive commercial, recreational and subsistence activities such as hunting and fishing. If actual risks are identified this project will inform how to economically and effectively minimize...

Date published: July 12, 2018
Status: Active

Ecologically-Driven Exposure Pathways Science Team

The Ecologically-Driven Exposure pathways team identifies internal and external pathways and processes that can alter exposure and toxicity of contaminants and pathogens to wildlife the environment. That information is used to distinguish actual health risks to fish and wildlife. If actual risks are identified this project will inform how to economically and effectively minimize risk...