The effects of anthropogenic chemicals on chemosensation and behavior in fish are growing ecological and regulatory concerns in North America.  Although these effects have recently been highlighted in the press for populations of anadramous salmonids in the Pacific Northwest, concern is now being raised about potential effects on other salmonids, other fish species, and other members of aquatic ecosystems across North America.  We propose a ½-day symposium in which platform presenters will discuss research on chemosensory and behavioral impairment in fish exposed to chemicals, the associated organismal and ecological consequences, and the regulatory implications.  The objectives of the symposium are to provide the audience with a comprehensive view of major concerns about impairment of chemosensation and behaviors caused by a wide variety of chemicals, and to bring researchers from various arenas together to identify common ground and remaining uncertainties.  AFS members will benefit because the fisheries community is being asked to comment on the importance of this issue and, in some cases, take management actions.  Novices and active participants in this field will be educated by a combination of overview presentations and results of recent research.  We will solicit abstracts from representatives of academia, government, and business, but we will also ensure that some slots are left available for unsolicited abstracts.  If more abstracts are received than can be accommodated in a 1/2-day platform session, we will explore the ideas of either having the extra presentations displayed as posters in the meeting room or allocating one or two platform time slots for the poster presenters to briefly summarize their posters (so attendees will be more likely to visit the posters later in the day).