News and Activities

Endocrine (Hormone) Disruption in Fish

Date Posted: November 29, 2006

Chesapeake Bay Field Office (CBFO) received 2005 and 2006 monies from the US Fish and Wildlife Service's Off-Refuge Investigation Fund to assess endocrine disruption in bass at five locations in the Potomac River Watershed. Between 80 and 100 percent intersex was observed at all sample sites during the first year of this study. This information, coupled with results from U.S. Geological Survey studies conducted in Virginia and West Virginia, suggests that intersex fish are widespread in the Potomac River Watershed. On September 6, 2006, The Washington Post featured an article on the front page entitled "Male Bass across Region found to be Bearing Eggs". This article has stirred a lot of interest from other media, including The News Hour with Jim Leher. A correspondent from The News Hour spent more than half a day on the Potomac River with staff from the CBFO and the Maryland Fisheries Resource Office. In addition to the increased media coverage, the Government Reform Committee of the U.S. Congress held hearings on this issue Wednesday October 4, 2006. Additional Information: On November 6, 2006 KARE 11 Minneapolis/Saint Paul Minnesota, aired an informative report about endocrine disruptors and the effects these chemicals are having on Minnesota fish. The story also mentions Congressional hearings in which DEQ staff participated. View the story on the KARE 11 Web site at CBFO assisted the Division of Environmental Quality with drafting testimony for this hearing.

Fred Pinkney, Chesapeake Bay Field Office (410) 573-4519

KARE 11 Minneapolis/Saint Paul - video clip no intersex fish in the Mississippi River

The Washington Post article - "Male Bass across Region found to be Bearing Eggs".

Last updated: June 12, 2015