The Fish on Your Hook: PFAS in Freshwater Sport and Subsistence Fishing
Freshwater fishing is both a beloved recreational pastime and a critical subsistence activity for millions of people worldwide. In the United States alone, approximately 38 million people fish recreationally each year; in many rural, Indigenous, and lower-income communities, fish caught from local waters provide a significant fraction of dietary protein. The widespread detection of PFAS in freshwater fish across contaminated watersheds—and the resulting consumption advisories issued by state health agencies—places anglers and fish-dependent communities in a difficult position between cultural practice, food security, and chemical exposure risk.
PFAS Accumulation in Freshwater Fish
Fish accumulate PFAS from both water and food sources—through respiratory uptake across gill membranes, direct ingestion of contaminated water, and consumption of prey organisms that have accumulated PFAS. Bioaccumulation factors (BAFs)—ratios of PFAS concentration in fish tissue to concentration in water—vary by PFAS compound and fish species, with long-chain PFAS (particularly PFOS) showing the highest BAFs due to their strong protein-binding affinity. Predatory fish species at the top of freshwater food chains—bass, pike, walleye, and large catfish—accumulate the highest PFAS tissue concentrations, reflecting dietary biomagnification across multiple trophic levels.
PFAS concentrations in fish vary widely depending on waterbody contamination levels, fish species, fish age and size (larger, older fish generally accumulate more PFAS), and anatomical tissue type (liver and skin typically contain higher PFAS than muscle). Studies of fish tissue PFAS in contaminated watersheds near military bases, industrial facilities, and PFAS-contaminated municipal water discharges have found PFOS concentrations in fish muscle tissue ranging from low nanograms per gram (below advisory thresholds) to hundreds of nanograms per gram (well above health-based limits) depending on proximity to contamination sources.
State Fish Consumption Advisories: A Patchwork System
State fish consumption advisory programs—administered by state departments of health and environmental quality—translate fish tissue PFAS concentrations into meal frequency recommendations for different population groups. Advisory thresholds vary significantly by state, reflecting different risk assessment approaches, population-specific considerations, and policy choices about tolerable PFAS intake. Michigan, New York, New Jersey, and Massachusetts have developed PFAS-specific fish consumption advisory criteria; other states apply broader contaminant advisories or have not yet developed PFAS-specific guidance.
The EPA’s 2024 national fish tissue PFAS guidance provides a federal framework for consistent advisory development across states, recommending maximum PFAS fish tissue concentrations that should prompt consumption advisories or outright prohibitions based on different consumption patterns. States are adapting this federal guidance into their advisory programs, creating a more consistent national picture—though interstate variation in advisory stringency and communication effectiveness remains substantial.
Environmental Justice and Indigenous Fishing Rights
Fish consumption advisories create particular hardships for communities that depend on local fish as a primary food source. Indigenous communities with treaty-guaranteed fishing rights, rural communities with limited access to alternative protein sources, and lower-income communities where fish provides affordable nutrition face disproportionate burdens when advisories restrict access to a culturally and nutritionally important food. Advisory programs must provide accessible, culturally sensitive communication in relevant languages, offer practical guidance on risk reduction strategies (fish species selection, meal preparation methods that reduce PFAS levels, portion management), and acknowledge the nutritional benefits of fish consumption that must be weighed against contamination risks in dietary recommendations for fish-dependent communities.