HOME >> BIOLOGY >> NEWS
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
617-954-3214
Geological Society of America
5-Nov-2001


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:
*Name:
*Comment:
*Email:


(Date:10/4/2017)... 4, 2017  GCE Solutions, a global clinical research organization (CRO), ... anonymization solution on October 4, 2017. Shadow is designed to assist ... with policy 0070 of the European Medicines Agency (EMA) in meeting ... ... ...
(Date:6/30/2017)... 2017 Today, American Trucking Associations announced ... face and eye tracking software, became the newest ... "Artificial intelligence and advanced sensing ... a driver,s attentiveness levels while on the road.  ... detect fatigue and prevent potential accidents, which could ...
(Date:5/16/2017)... 16, 2017  Veratad Technologies, LLC ( www.veratad.com ), ... and identity verification solutions, announced today they will participate ... May 15 thru May 17, 2017, in ... Trade Center. Identity impacts the lives ... today,s quickly evolving digital world, defining identity is critical ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... The ... context, enabling overexpression experiments and avoiding the use of exogenous expression plasmids. The ... transformative for performing systematic gain-of-function studies. , This complement to loss-of-function studies, ...
(Date:10/11/2017)... 2017  VMS BioMarketing, a leading provider of patient support ... Nurse Educator (CNE) network, which will launch this week. The ... health care professionals to enhance the patient care experience by ... other health care professionals to help women who have been ... ...
(Date:10/11/2017)... ... October 11, 2017 , ... Singh Biotechnology ... drug designation to SBT-100, its novel anti-STAT3 (Signal Transducer and Activator of Transcription ... is able to cross the cell membrane and bind intracellular STAT3 and inhibit ...
(Date:10/10/2017)... ... October 10, 2017 , ... Dr. Bob Harman, founder and CEO ... Diego Rotary Club. The event entitled “Stem Cells and Their Regenerative ... attendees. Dr. Harman, DVM, MPVM was joined by two human doctors: Peter B. ...
Breaking Biology Technology:
Cached News: