Consuming fish is part of a healthy diet, and has many benefits. The following information is helpful to determine the safe consumption levels for fish caught in Wisconsin streams, rivers and lakes. Search DNR for your county's fish advisories or learn more about fish consumption in general.
Mercury, PCBs and You
The two most common water contaminants found in rivers, streams, and lakes in Wisconsin are PCBs and Mercury. They frequently accumulate in fish. Below is more information:
Polychlorinated biphenyls (PCBs)
PCBs are a group of manufactured organic chemicals. People are exposed to PCBs through fish from contaminated waters. Because they do not break down easily, PCBs are now found widely distributed in our environment but remain in sediments near industries that manufacture or used PCBs.
Tips on reducing PCBs in Fish:
- Fatty fish, bottom feeding fish, and fish from contaminated waters have the greatest PCB concentrations.
- Eat smaller, younger fish.
- People who have been regularly exposed to PCBs are at greater risk for health problems.
- Great Lakes fish and fish from some of Wisconsin's major rivers (Sheboygan, Cedar Creek, Milwaukee, Lower Fox) have higher levels of PCBs than fish from Wisconsin inland lakes and other rivers.
Mercury is an element that is released into the air from a variety of processes including coal burning. It can travel long distances and be deposited on soil and in lakes.
Tips on Mercury in Fish:
- Mercury exists in several forms that build up in the bodies of fish, wildlife, and humans that consume food from aquatic food chains.
- Mercury cannot be removed from the fish.
- People are primarily exposed to mercury from eating fish or shellfish.
- Choose fish species with low mercury levels according to state and national advisories
Fish Eating Guidelines for Families
A Guide to Eating Fish for Older Adults (Mercury) (PDF, 504 KB)
A brochure about safe eating guidelines for fish from Wisconsin waters and for fish bought in restaurants and stores.
What Women of Childbearing Age Should Know About Eating Fish (PDF, 600 KB)
Available in Spanish and Hmong
Advisory Information for Fox River Valley
Fish from the Fox River Valley surrounding areas contain chemicals. Eating too much may be harmful, especially for women and children. Follow the safe fish eating guidelines below for the specified regions.
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Information for Health Professionals
The educational media module series, "Fish Facts" can be accessed at www.fish-facts.org. The media series is comprised of four, 3-5 minute media modules. It is designed for busy health professionals interested in learning more about the risks and benefits of fish consumption and methylmercury (CH3Hg) exposure.
Fish Facts Workbook (PDF, 655 KB)
This workbook complements the media series and provides more in-depth information and resources for those seeking additional information.
DHS Toxic Chemical Fact Sheet Series: PCBs
September 1993 Protocol for a Uniform Great Lakes Sport Fish Consumption Advisory (PDF, 193 KB)
May 2007 Addendum: A Protocol for Mercury-based Fish Consumption Advice (PDF, 184 KB)
Environmental Research Program, Final Report August 2005. Population-Based Methylmercury Exposure Assessment
*Prepared by: Lynda Knobeloch, PhD, Senior Toxicologist and Henry Anderson, MD, Chief Medical Officer, both from the Wisconsin Department of Health Services
Resources and Links
- "Fishing Wisconsin" Information from DNR
- Environmental Protection Agency Fish Advisory for Pregnant Women and Young Children
- Fish Consumption Advisory for Wisconsin
- Online Continuing Medical Education Course: Healthy Fish Choices