Navigation Links
Mood-modifying drugs for humans also alter fish behavior

This release is available in Arabic, French, Japanese, Spanish, Swedish, and Chinese.

Pharmaceutical drugs that end up in the world's waterways after being excreted, flushed and treated at wastewater treatment plants may lead to unexpected ecological impacts, according to a new study of wild European perch. Tomas Brodin and colleagues from Ume University in Sweden discovered that the fish ate faster, became bolder and acted less social after being subjected to an anxiety-moderating drug, known as Oxazepam.

The psychiatric drug is used to treat anxiety in humans. But, Oxazepam residues often wind up in natural aquatic systems, downstream from sewage treatment plants, where their effects on ecosystems have been unknown. Now, Brodin and the other researchers have dosed wild perch with amounts of Oxazepam equivalent to those found in Sweden's rivers and streams, and their results suggest that even small amounts of the drug can alter the behavior and the foraging rates of these fish.

The related report appears in the 15 February issue of the journal Science, which is published by AAAS, the nonprofit science society.

"While alone, fish that were exposed to Oxazepam dared to leave safe refuge and enter novel, potentially dangerous areas," explained Brodin. "In contrast, unexposed fish stayed hidden in their refuge. The exposed fish seemed much less stressed and scared, behaving calmer and bolder."

Perch that were exposed to the drug also devoured their food quicker than unexposed fisha behavioral quirk that the researchers say could alter the composition of species in the water and lead to ecological events, such as increased algal blooming, over time. Since fish are generally integral pieces of their food webs, changes in their eating patterns could disturb ecological balances, according to the researchers.

The fish that were given Oxazepam during the study also became anti-social, distancing themselves from other perch and putting themselves at greater risk of predation. "Perch that were exposed to Oxazepam lost interest in hanging out with the group, and some even stayed as far away from the group as possible," explained Brodin.

The fish in the study accumulated concentrations of the drug in their muscle tissues that were comparable to those found in wild fish, according to the researchers. So it's likely that the fish in Sweden's surface waters, many of which are being exposed to similarly diluted doses of Oxazepam, may be experiencing changes in their behavior and feeding rates as well, they say.

This study by Brodin and his colleagues singled out a particular psychiatric drug that has been found in natural systems. But, a veritable cocktail of drugs can be found in waterways worldwide, making the discovery of Oxazepam's effects on fish that much more important.

More comprehensive studies are needed before general conclusions can be drawn about how such pharmaceutically induced changes to behavior might affect ecosystems, but these current findings suggest that the concentrations of Oxazepam in Sweden's surface waters could have unexpected ecological and evolutionary consequences over time.

"The solution to this problem isn't to stop medicating people who are ill but to try to develop sewage treatment plants that can capture environmentally hazardous drugs," concluded Jerker Fick, a co-author of the Science report, in a press release from Ume University.


Contact: Natasha Pinol
American Association for the Advancement of Science

Related biology news :

1. Newly released FDA draft guidelines for biosimilar drugs to be discussed at conference
2. Nanopills release drugs directly from the inside of cells
3. Genetic variation in East Asians found to explain resistance to cancer drugs
4. Discovery provides blueprint for new drugs that can inhibit hepatitis C virus
5. Internet and new drugs: A challenge for public health
6. Study raises questions about use of anti-epilepsy drugs in newborns
7. Drugs from lizard saliva reduces the cravings for food
8. A new method detects traces of veterinary drugs in baby food
9. La Jolla Institute discovery could lead to new way to screen drugs for adverse reactions
10. MIT-designed cooler preserves tuberculosis drugs, records doses
11. Arsenic for better drugs and cleaner crops
Post Your Comments:
Related Image:
Mood-modifying drugs for humans also alter fish behavior
(Date:11/17/2015)... PARIS , November 17, 2015 ... 17 au 19 novembre  2015.  --> Paris ... 2015.  --> DERMALOG, le leader de l,innovation ... à la fois passeports et empreintes sur la même ... pour les passeports et l,autre pour les empreintes digitales. ...
(Date:11/12/2015)... 12, 2015  A golden retriever that stayed healthy ... (DMD) has provided a new lead for treating this ... Broad Institute of MIT and Harvard and the University ... Cell, pinpoints a protective gene ... disease,s effects. The Boston Children,s lab of Lou ...
(Date:11/10/2015)... 10, 2015  In this report, the ... of product, type, application, disease indication, and ... report are consumables, services, software. The type ... biomarkers, efficacy biomarkers, and validation biomarkers. The ... diagnostics development, drug discovery and development, personalized ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... ... November 24, 2015 , ... ... year and one of the premier annual events for pharmaceutical manufacturing: 2015 Annual ... November 2015, where ISPE hosted the largest number of attendees in more than ...
(Date:11/24/2015)... , Nov. 24, 2015  Clintrax Global, Inc., a worldwide ... Carolina , today announced that the company has set a ... a 391% quarter on quarter growth posted for Q3 of 2014 ... and Mexico , with the establishment of ... December 2015. --> United Kingdom and ...
(Date:11/24/2015)... , ... November 24, 2015 , ... This fall, global ... competitive events in five states to develop and pitch their BIG ideas to improve ... each state are competing for votes to win the title of SAP's Teen Innovator, ...
(Date:11/24/2015)... November 24, 2015 SHPG ) announced today ... the Piper Jaffray 27 th Annual Healthcare Conference in ... 2015, at 8:30 a.m. EST (1:30 p.m. GMT). --> ... Officer, will participate in the Piper Jaffray 27 th Annual ... on Tuesday, December 1, 2015, at 8:30 a.m. EST (1:30 p.m. ...
Breaking Biology Technology: