Recreational and Commercial Fishing and Hunting and Subsistence Living
Fish and wildlife that are healthy, abundant, and safe to eat drive many economically valuable commercial, recreational, and subsistence activities, and are a treasured part of the American landscape. Contaminant and pathogen exposures are known to impact these natural resources. U.S. Geological Survey (USGS) scientists in the Fishing and Hunting Science Team, together with other federal, state and university collaborators, conduct scientific research that informs resource managers how to economically and effectively minimize risk to fish and wildlife by understanding the environmental transport, fate, exposure pathways, and potential biological effects of contaminants and pathogens. Because fish and wildlife can move over sometimes large distances, we need to study if and how they are exposed to contaminants and pathogens across landscapes, particularly on public lands and those managed by the U.S. Department of the Interior.
Are Tumors in Wild Fish Harvested in the Great Lakes Region Related to Contaminants in Water Resources?
Current Science Questions and Activities
- Are sport fish in the Northeast U.S. exposed to chemical contaminants that are adversely affecting their health, reproduction and populations?
- How important are contaminants in relation to other risk factors (climatic, water quality, parasite, pathogen) influencing adverse health effects in Northeast United States sport fish?
- What is the susceptibility of black bass to formation of intersex from exposure to endocrine disrupting contaminants?
- Determine if exposures to endocrine disrupting contaminants during early development cause adverse outcomes later in life or in subsequent generations that lead to population-level declines in wild fish.
- The direct effects of contaminants on waterfowl are usually easily detected and therefore are well studied (for example waterfowl found dead at a contaminated site). However waterfowl that survive a contaminant exposure may still die from the contaminant through secondary causes (for example a sublethally poisoned waterfowl may die from starvation). Are sublethal contaminant exposures causing waterfowl mortalities due to secondary factors such as starvation?
- What is the extent of environmental contaminants in tissues of sport fishes caught in various Missouri waterbodies? Do these contaminants pose a health risk to the fish or people who harvest the fish?
- What are the land use, habitat, and ecological factors that control pesticide and mercury exposures in sportfish from the Columbia River Basin?
- Are pesticide and mercury concentrations correlated with biomarkers of adverse health impacts of sportfish in the Columbia River Basin?
- Is there a human health risk due to pesticide and mercury in sportfish harvested from the Columbia River basin?
- Is the body condition of ducks harvested by hunters in the Pacific Flyway adversely impacted by environmental mercury exposures?
- Is there a human health risk due to mercury in ducks harvested in the Pacific Flyway?
- The presence of liver tumors in the white sucker is currently used as a biomarker of contaminant exposure that is used to define Areas of Concern within the Great Lakes region. Are these viruses risk factors associated with the genesis of liver or skin tumors?
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