Navigation Links
Gender-bending fish on the rise in southern Alberta
Date:7/29/2010

Chemicals present in two rivers in southern Alberta are likely the cause of the feminization of fish say researchers at the University of Calgary who have published results of their study in the journal Environmental Toxicology and Chemistry.

"What is unique about our study is the huge geographical area we covered. We found that chemicals man-made and naturally occurring that have the potential to harm fish were present along approximately 600 km of river," says paper co-author Lee Jackson, executive director of Advancing Canadian Wastewater Assets, a research facility that develops and tests new approaches for treating wastewater which will be located at the City of Calgary's new Pine Creek Wastewater Treatment Centre. "The situation for native fish will likely get worse as the concentration of organic contaminants will become more concentrated as a response to climate change and the increase in human and animal populations," adds Jackson.

The study focused on two rivers in the South Saskatchewan River Basin: The Red Deer and Oldman rivers, located in southern Alberta, Canada. The water was analyzed for more than two dozen organic contaminants, many with hormone-like activity, commonly found in wastewater or rivers impacted by human and agricultural activity. Compounds detected in the water included synthetic estrogens (birth control pill compounds and hormone therapy drugs); bisphenol A, a chemical used in making plastics; and certain types of natural and synthetic steroids that are byproducts of agricultural run-off and cattle farming.

Researchers tested a native minnow, longnose dace (Rhinichthys cataractae), and found that at nearly every site, 14 out of 15 locations, males showed elevated levels of a protein, hepatic vitellogenin, which is normally only found in the blood of females and is used by females to produce eggs.

Co-author Hamid Habibi says the results downstream of two communities are striking.

"Most notably, we saw a significant increase in a specific protein marker for the presence of compounds with estrogen-like activity in areas downstream, south of Fort Macleod and Lethbridge. Our results showed females make up 85 per cent of the population of longnose dace. In the upstream locations, females comprise 55 per cent of the population," says Habibi, who is also the director of the newly established Institute of Environmental Toxicology at the University of Calgary.

This study is part of a larger research project by Habibi and Jackson, professors in the Department of Biological Sciences, who are studying the impact of environmental contaminants with hormone-like activity in Southern Alberta rivers and lakes.


'/>"/>

Contact: Leanne Yohemas
leanne.yohemas@ucalgary.ca
403-220-5144
University of Calgary
Source:Eurekalert  

Related medicine news :

1. International study confirms doubling of childhood leukemia rates in southern Iraq
2. KID HEALTHY-Steps to Healthy Living Kicks Off 2010 Campaign to Make Southern California Kids and Families Healthier
3. ModiFace Launches VuMe in Southern Florida – the World's First Full-Featured Touch-Screen Cosmetic Surgery Imaging System
4. Kaiser Permanente Southern California to Offer FitOrbit Online Personal Training to Targeted Patients
5. Air Ambulance Company AirMed International Endorsed by Southern Medical Association
6. New DNA Test Helps Diagnose Early Lyme Disease Case: Milford Hospital Pathologist Alerts Southern Connecticut Physicians
7. Obesity a Bigger Threat to Kids in Southern States
8. Scientists offer solutions to arsenic groundwater poisoning in southern Asia
9. Researchers offer solutions to poisonous well-water crisis in southern Asia
10. Most common cancers in the world decreasing in Alberta: Study
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Gender-bending fish on the rise in southern Alberta
(Date:7/25/2017)... ... July 25, 2017 , ... Summers in Palm Springs ... air conditioner — think homemade gourmet ice cream, sparkling pools, and mile-high fun. , ... featuring fun mugs, journals, and other must-have knick knacks. Ice cream and sorbet flavors ...
(Date:7/25/2017)... (PRWEB) , ... July 25, 2017 , ... ... education programs at Spring Arbor University recently co-authored and published an article in ... Adolescents with Neonatal Brachial Plexus Palsy. Both the article and the research that ...
(Date:7/25/2017)... ... July 25, 2017 , ... SignatureCare Emergency Center – South Austin is treating ... Hours a day. , The Emergency Room opened early March, making ... four months now and things are running smoothly,” said Aaron Braun, SignatureCare Emergency Center’s ...
(Date:7/24/2017)... ... July 24, 2017 , ... Cosmetic Town, an online plastic ... cosmetic surgeries they perform on a daily basis. , The new video series ... they specialize in at their practices. , When asked about the new video ...
(Date:7/24/2017)... ... 24, 2017 , ... The International Essential Tremor Foundation (IETF) will host a ... (ET). The seminar will take place on Saturday, Aug. 26 at the Embassy Suites ... will run from 9 a.m. to 12 p.m., with check-in beginning at 8 a.m. ...
Breaking Medicine News(10 mins):
(Date:7/6/2017)... division of Diplomat Specialty Infusion Group, is celebrating a decade of empowering ... celebrate its anniversary, ThriveRx recently launched a redesigned website at thriverx.diplomat.is ... to create the best user experience for consumers and health care professionals. ... Diplomat Pharmacy ... "We,ve made several great strides throughout the past 10 years," ...
(Date:7/5/2017)... -- Oramed Pharmaceuticals Inc. (NASDAQ: ORMP ... pharmaceutical company focused on the development of oral drug delivery ... Israel Securities Authority to dual-list its common stock on the ... trading on the TASE on July 12, 2017 under the ... Company, it is expected that Oramed will be included in ...
(Date:7/5/2017)... Wash. , July 5, 2017   BioLife ... leading developer, manufacturer and marketer of proprietary clinical grade ... cryopreservation freeze media ("BioLife"), today announced that it ... its debt holder and largest shareholder, to modify its ... Pursuant to the modification, WAVI agreed to exchange ...
Breaking Medicine Technology: