Featured Research

from universities, journals, and other organizations

Chemicals are likely cause of feminization of fish present in two rivers in Alberta, Canada, researchers find

Date:
July 30, 2010
Source:
University of Calgary
Summary:
Chemicals present in two rivers in southern Alberta are likely the cause of the feminization of fish, say researchers.

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.


Story Source:

The above story is based on materials provided by University of Calgary. Note: Materials may be edited for content and length.


Journal Reference:

  1. Jeffries et al. Presence of natural and anthropogenic organic contaminants and potential fish health impacts along two river gradients in Alberta, Canada. Environmental Toxicology and Chemistry, 2010; DOI: 10.1002/etc.265

Cite This Page:

University of Calgary. "Chemicals are likely cause of feminization of fish present in two rivers in Alberta, Canada, researchers find." ScienceDaily. ScienceDaily, 30 July 2010. <www.sciencedaily.com/releases/2010/07/100729122332.htm>.
University of Calgary. (2010, July 30). Chemicals are likely cause of feminization of fish present in two rivers in Alberta, Canada, researchers find. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2010/07/100729122332.htm
University of Calgary. "Chemicals are likely cause of feminization of fish present in two rivers in Alberta, Canada, researchers find." ScienceDaily. www.sciencedaily.com/releases/2010/07/100729122332.htm (accessed October 22, 2014).

Share This



More Earth & Climate News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

San Diego Zoo's White Rhinos Provide Hope for the Critically Endangered Species

San Diego Zoo's White Rhinos Provide Hope for the Critically Endangered Species

Reuters - Light News Video Online (Oct. 22, 2014) — The pair of rare white northern rhinos bring hope for their species as only six remain in the world. Elly Park reports. Video provided by Reuters
Powered by NewsLook.com
Trick-or-Treating Banned Because of Polar Bears

Trick-or-Treating Banned Because of Polar Bears

Buzz60 (Oct. 21, 2014) — Mother Nature is pulling a trick on the kids of Arviat, Canada. As Mara Montalbano (@maramontalbano) tells us, the effects of global warming caused the town to ban trick-or-treating this Halloween. Video provided by Buzz60
Powered by NewsLook.com
Traditional Farming Methods Gaining Ground in Mali

Traditional Farming Methods Gaining Ground in Mali

AFP (Oct. 20, 2014) — He is leading a one man agricultural revolution in Mali - Oumar Diatabe uses traditional farming methods to get the most out of his land and is teaching others across the country how to do the same. Duration: 01:44 Video provided by AFP
Powered by NewsLook.com
How Detroit's Money Woes Led To U.N.-Condemned Water Cutoffs

How Detroit's Money Woes Led To U.N.-Condemned Water Cutoffs

Newsy (Oct. 20, 2014) — The United Nations says water is a human right, but should it be free? Detroit has cut off water to residents who can't pay, and the U.N. isn't happy. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins