Chemical Combo and Intersex Fish Found at Smallmouth Bass Nesting Sites Completed
Dissecting a Fish to Determine Possible Endocrine Disruption Effects
Chemical contaminants including herbicides, veterinary pharmaceuticals, and biogenic hormones have been detected at fish nesting sites in the Potomac River watershed where endocrine disruption in smallmouth bass (Micropterus dolomieu) was also observed. Although these contaminants are known to originate from a variety of human and animal-waste sources, results of a recent U.S. Geological Survey (USGS) study corroborate previous studies suggesting that seasonal runoff from agricultural activities is an important source of exposure to endocrine disrupting chemicals by smallmouth bass during critical life stages.
![USGS scientist dissecting a fish to determine possible effects from exposure to endocrine disrupting contaminants](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/thumbnails/image/luke_usgs_hicks_landing_10-15-08_l.jpg?itok=_r112O4R)
In the study, reported in Science of the Total Environment and Environmental Monitoring and Assessment, a team of USGSscientists collected water and bed sediment samples from fish nesting sites and studied fish from these sites where smallmouth bass spawn and build nests in the Potomac River watershed. This study and others help determine the seasonality and sources of chemical exposures contributing to abnormal fish health, such as intersex, observed in this region. Natural-resource managers, scientists, regulators, and others can use the results to inform decisions regarding overall fish health throughout the Chesapeake Bay region.
The Toxic Substances Hydrology, Contaminant Biology, Priority Ecosystems Science, and Fisheries: Aquatic and Endangered Resources Programs of the U.S. Geological Survey supported this study. Funding was also provided by the West Virginia Division of Natural Resources, West Virginia Department of Environmental Protection, Virginia Departments of Game and Inland Fisheries and Environmental Quality, and Maryland Department of Natural Resources.
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Chemical contaminants including herbicides, veterinary pharmaceuticals, and biogenic hormones have been detected at fish nesting sites in the Potomac River watershed where endocrine disruption in smallmouth bass (Micropterus dolomieu) was also observed. Although these contaminants are known to originate from a variety of human and animal-waste sources, results of a recent U.S. Geological Survey (USGS) study corroborate previous studies suggesting that seasonal runoff from agricultural activities is an important source of exposure to endocrine disrupting chemicals by smallmouth bass during critical life stages.
![USGS scientist dissecting a fish to determine possible effects from exposure to endocrine disrupting contaminants](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/thumbnails/image/luke_usgs_hicks_landing_10-15-08_l.jpg?itok=_r112O4R)
In the study, reported in Science of the Total Environment and Environmental Monitoring and Assessment, a team of USGSscientists collected water and bed sediment samples from fish nesting sites and studied fish from these sites where smallmouth bass spawn and build nests in the Potomac River watershed. This study and others help determine the seasonality and sources of chemical exposures contributing to abnormal fish health, such as intersex, observed in this region. Natural-resource managers, scientists, regulators, and others can use the results to inform decisions regarding overall fish health throughout the Chesapeake Bay region.
The Toxic Substances Hydrology, Contaminant Biology, Priority Ecosystems Science, and Fisheries: Aquatic and Endangered Resources Programs of the U.S. Geological Survey supported this study. Funding was also provided by the West Virginia Division of Natural Resources, West Virginia Department of Environmental Protection, Virginia Departments of Game and Inland Fisheries and Environmental Quality, and Maryland Department of Natural Resources.
Related science listed below.
Common Weed Killer is Widespread in the Environment
Measuring POEA, a Surfactant Mixture in Herbicide Formulations
Biological Activity of Steroid Hormones in U.S. Streams
Pesticides Found in Amphibians from Remote Areas in California
Contaminants Affect Fish and Wildlife in the Chesapeake Bay
Improvements in Wastewater Treatment Reduces Endocrine Disruption in Fish
Evidence of Endocrine Disruption Unexpectedly Found in Minnesota Lakes
Estrogenic Contaminants from Plants and Fungi Found in Iowa Streams
Hormones Degrade in the Environment!
Antidepressants in Stream Waters! Are They in the Fish Too?
Related publications listed below.