A fish named Wayne-Wanda?

Hermaphrodite fish are on the rise, thanks to the birth control pill and other natural and unnatural forms of estrogen that have made their way into the water. Feminized fish were first found downstream from sewage plants in the United Kingdom.

"Closer to home, we have observed intersex White Perch in various locations in the Great Lakes, " explained Chris Metcalfe, professor of Environmental and Resource Studies at Trent University in Ontario. "And in the Columbia River, there is a much higher proportion of female salmon than males, indicating that some feminization process may be going on."

Metcalfe conducted lab experiments on aquarium fish to try to find out which of the various forms of estrogen were the culprit in the sexual alteration of fish. He will report his research findings as well as share new statistics on estrogen concentrations in water that were generated by the Canadian Department of Environment in Burlington, Ontario, on Monday, November 5, at the Geological Society of America's annual meeting in Boston.

Metcalfe found that very low levels of the estrogen hormones, 17 alpha-ethinylestradiol, 17 beta-estradiol, estrone and estriol, caused intersex and altered sex ratios in the aquarium fish.

"Ethinylestradiol is the active ingredient in the birth control pill," he said. "The other compounds are the natural female estrogen (beta estradiol) and metabolites of that compound excreted by women."

Metcalfe also found from his experiments that estrogen-mimicing degradation products of alkylphenol ethoxylate surfactants (compounds used in such things as pesticides, detergents, and cosmetics) and the plasticizer, Bisphenol A (used in lacquers for dental treatment and to coat food cans and other metal containers), had little or no estrogenic effects on the fish. He believes that it is the female estrogen hormones released from sewage treatment plants that are responsible for the feminization of wild fish.


Contact: Ann Cairns
Geological Society of America

Page: 1

Related biology news :

1. UCSF scientist Joe Derisi named MaCarthur Fellow
2. DuPont scientist named one of the worlds top young innovators by MITs Technology Review Magazine
3. UGA named recipient of $5.6 million grant from NSF for corn improvement
4. USC researcher named General Motors Cancer Research Scholar
5. Device that rapidly detects nerve agents named one of greatest army inventions for 2003
6. Fox Chase Cancer Centers Alfred Knudson Jr. named 2004 Kyoto Prize winner
7. Four tourist destinations named best worldwide
8. UGA professor Jeffrey Bennetzen named to National Academy of Sciences
9. Principal investigators named for international scholars in breast cancer research program
10. Houston scientist named as rising star in chemistry
11. Nerac again named one of Connecticuts fastest growing technology companies

Post Your Comments:
TAG: fish named Wayne Wanda

(Date:10/7/2015)... 8, 2015 --> ... Cards (FPC) during third quarter 2015 amounted to around 960 ... 860 MSEK that was communicated 20 August 2015. ... delivery capacity and a continued growing demand for the company,s ... to be higher than during the third quarter. The revenue ...
(Date:10/5/2015)... http://soundview.co ) releases ... (NASDAQ: NXTD ), a biometric authentication company focused ... http://soundview.co ) releases the following market and ... a biometric authentication company focused on the growing mobile ... http://soundview.co ) releases the following market and ...
(Date:9/30/2015)... 2015  The U.S. Court of Appeals for the ... in favor of Crossmatch ™, affirming the International ... Suprema and its U.S. partner Mentalix violated Section 337 ... that declares it unlawful to engage in "unfair practices" ... Crossmatch,s patents, the 5,900,993 patent and the 7,203,344 patent. ...
Breaking Biology News(10 mins):
(Date:10/8/2015)... -- Today the Wyss Institute for Biologically Inspired Engineering at ... Opsonix Inc. The announcement follows a worldwide ... Development (OTD) and Opsonix Inc. enabling the company ... --> --> ... year in the U.S. — more than prostate cancer, ...
(Date:10/8/2015)... ... October 08, 2015 , ... Talon Innovations, a provider ... and other technology-driven industries, announces that it is one of three finalists for the ... Company.” On Thursday, September 25 Talon Innovations was recognized as a nominee for ...
(Date:10/8/2015)... ... October 08, 2015 , ... Cystic ... transmembrane conductance regulator (CFTR) gene and results in dysfunction of the lungs and ... in the lungs. This mucus is very difficult to clear, blocks the airways ...
(Date:10/7/2015)... -- Boston Scientific (NYSE: BSX ) ... Scientific Connected Patient Challenge , an open innovation contest ... patient monitoring to enhance patient care.  Until January 5, ... ideas and collaborate on solutions through Medstro,s ... Cambridge, MA where they will present their ...
Breaking Biology Technology:
Cached News: