Thames Anglers' Conservancy Members Forum
TAC Members-Only Forum
If you have arrived here and not yet signed up as a member, then please first join at http://t-a-c.forumotion.com/register using your real name.

Forum Membership is with Real Names only.
Please create a Username that is your First Name and Surname eg. "Joe Bloggs"
(This will save our Admin team the need to contact you about changing it)

http://rivertac.org/membership


Thames Anglers' Conservancy Members Forum
 
HomeHome  TAC Home PageTAC Home Page  SearchSearch  FAQFAQ  RegisterRegister  Log in  
Navigation
Search
 
 

Display results as :
 
Rechercher Advanced Search
Latest topics
» Hampton Riviera removed
Thu Aug 16, 2018 10:41 pm by Ed Randall

» Roads closed everywhere ~ July 29th/30th ~ bike race
Mon Aug 06, 2018 10:14 am by John LeSurf

» *Thames Tunnel (Tideway Tunnel)*
Wed Jul 18, 2018 9:56 am by John LeSurf

» new hotel at hampton court means loss of fishing
Wed Jul 04, 2018 1:26 pm by Ed Randall

» Eel Trap Clean Up/ training 5th May 2018 10am
Sat Jun 09, 2018 3:46 pm by Ed Randall

» FORCE clean-up in Donkey Wood ~ Sun 13th May 2018
Thu May 17, 2018 10:16 am by JeffHowe

» TOP RIVER ANGLERS UNITE TO FORM NEW CONSERVATION GROUP
Thu Apr 05, 2018 2:23 pm by John LeSurf

» penton hook tidy up.
Wed Mar 07, 2018 7:05 am by John LeSurf

» Riverfly & Clean-up Donkey Woods Saturday 18th Nov 2017
Sat Dec 23, 2017 1:02 pm by Ed Randall

» Biggest fish of all book
Fri Dec 22, 2017 5:43 pm by Adrian Hoare

» Wandle Trust - eel pass installation - call for volunteers
Thu Dec 07, 2017 8:53 am by Ed Randall

» Outfall Safari across London - call for Volunteers!
Thu Dec 07, 2017 8:47 am by Ed Randall

» Fishing the Thames at Medley
Thu Nov 02, 2017 2:33 pm by Trevor Rowe

» Thames Semi-Tidal Draw Off 2017
Fri Oct 20, 2017 9:08 pm by Ed Randall

» Eel Trap Results 2017
Tue Oct 17, 2017 6:07 pm by patrick barker

» Fish-swallowing Angler "lucky to be alive"
Sat Oct 14, 2017 8:01 am by Ed Randall

» River Mole polluted at Horley
Fri Oct 13, 2017 8:52 am by Ed Randall

» Petition to stop the export of elvers
Thu Sep 21, 2017 2:16 pm by Ed Randall

» Riverfly Training ~ Hogsmill ~ 30th Sept 2017
Sat Sep 16, 2017 6:56 am by Ed Randall

» Monster fatberg in Whitechapel
Tue Sep 12, 2017 1:40 pm by Ed Randall

» Radio 4 ~ Macquarie: The Tale of the River Bank
Tue Sep 12, 2017 12:28 pm by Ed Randall

» Thames TideFest 10th September 2017
Tue Sep 12, 2017 9:00 am by John LeSurf

» Invitation to the 2017 Eel Forum ~ 17th October
Sat Sep 09, 2017 8:32 am by Ed Randall

» Do you recognise any of these men?
Sat Aug 19, 2017 8:44 pm by Ed Randall

» Better access to free Thames fishing in Reading
Fri Jun 16, 2017 10:08 am by Ed Randall

» Eel screens on Water Works intakes
Tue May 23, 2017 10:26 pm by Julian Jones

» River Thames Conditions - Quick Dial Numbers
Sun May 21, 2017 10:00 am by Ed Randall

» Ap[ril showers? If only! Drought beckons...
Thu May 04, 2017 6:56 pm by Ed Randall

» Abbey river this Saturday (12/5/2012)
Thu Apr 27, 2017 4:41 pm by Ed Randall

» Molesey Eel Monitoring Training ~ 29th April 2017
Mon Apr 24, 2017 11:12 am by David Harvey

Angling Data View
River Levels
UK Map

Thames Tides

Share | 
 

 Something fishy going on... Antidepressants contaminating rivers make perch antisocial

Go down 
AuthorMessage
David Harvey

avatar

Male Posts : 5381
Join date : 2010-01-21
Age : 103
Location : Surrey,

PostSubject: Something fishy going on... Antidepressants contaminating rivers make perch antisocial   Sat Feb 16, 2013 3:27 pm

From: http://www.independent.co.uk/news/science/something-fishy-going-on-antidepressants-contaminating-rivers-make-perch-antisocial-8495075.html


Drugs used to treat anxiety and depression are contaminating rivers and streams where they are building up in concentrations that can affect the behaviour of wild freshwater fish, scientists have found.

Significant amounts of a benzodiazepine drug called Oxazepam, which is widely used to treat anxiety, are being flushed into rivers from sewage works. The concentrations are too low to be considered a health risk to humans but a study has shown they can still affect fish.

Benzodiazepines, such as Valium, are one of the most widely prescribed groups of drugs. They can be excreted from the body intact and persist in the treated effluent water released from sewage works into rivers, scientists said.

A study carried out in Sweden found that the relatively low concentrations of benzodiazepines commonly found in rivers throughout Europe, including Britain, can significantly affect the behaviour of the European perch.

The scientists found that perch exposed to extremely small concentrations of Oxazepam, as low as a fraction of a microgram per litre of water, were less sociable, bolder and ate faster than fish that were not exposed to the drug.

The scientists believe the subtle behavioral changes seen under experimental conditions indicate how the wider freshwater ecology could be affected by this kind of hidden environmental pollution.

They said that pharmaceutical compounds released into the aquatic environment might pose a greater problem than hitherto realised and that more should be done to degrade the chemicals before being released in the treated effluent water from sewage works.

“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,” said Jerker Fick of Umeå University in Sweden, who was part of the team.

“These drugs are not toxic or harmful in small doses, and are used to treat patients for therapeutic reasons. So there has not been that much research into what it does when it gets into our waterways,” Dr Fick said.

A survey of the River Fyris in Sweden, which receives wastewater effluent from the city of Uppsala, found concentrations of oxazepam of around 0.58 micrograms per litre. “These concentrations are comparable to hose of benzodiazepines reported in other European and American waters,” the scientists report in the journal Science.

It was one of 21 pharmaceuticals found in the water sampled by the researchers that have a similar effect to Oxazepam, the scientists said.

Tomas Brodin of Umea, the lead author of the study, told the American Association for the Advancement of Science meeting in Boston that when wild perch were exposed to similar concentrations they exhibited subtle but distinct changes to their natural behaviour.

“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,” Dr Brodin said.

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

Fish exposed to the drug ate faster than non-exposed fish. This could affect the wider ecology because more voracious perch would eat more of the zooplankton that might otherwise prevent algal blooms, Dr Fick said.

'We found distinct behavioural changes in the perch, even at low levels of exposure. The changes can be seen as both beneficial or detrimental depending on the ecology,“ he said.

”The fish became bolder and fed faster, which is a good thing if there are no predators around, but could be risky if there are,“ be added.

”It could also have a knock-on effect on the surrounding environment. If the fish eat more zooplankton, then there is less in the water. Zooplankton eat algae, so without them there could be algae blooms.“
Back to top Go down
http://Rivertac.org
 
Something fishy going on... Antidepressants contaminating rivers make perch antisocial
Back to top 
Page 1 of 1
 Similar topics
-
» FISHING VERY COLOURED RIVERS?
» Plastic Waste in Rivers
» how do i make a gas pedal ?
» How to make the most of your athletic profile
» Will a Slow Moving Vehicle sign make my mower street legal?

Permissions in this forum:You cannot reply to topics in this forum
Thames Anglers' Conservancy Members Forum :: Open Section :: Conservation Issues-
Jump to: