Navigation Links
A new chemical method for distinguishing between farmed and wild salmon
Date:9/30/2009

Wild salmon and farmed salmon can now be distinguished from each other by a technique that examines the chemistry of their scales.

Dr Clive Trueman, who is based at the National Oceanography Centre, Southampton said:

"Salmon farming is a big, intensive business. In 2006, around 130,000 tonnes of salmon were farmed in Scotland for the table. Wild populations of Atlantic salmon are in serious decline across their whole range and the total wild population returning to Scottish rivers in the same year is estimated at less than 5000 tonnes. Wild fish are rare and expensive so there is a strong incentive for fraudulent labelling. Farmed fish also escape into rivers, harming the wild population. Unfortunately, it can be difficult to distinguish between farmed and wild fish"

The new work which was done in collaboration with the Scottish Association for Marine Science (SAMS), Oban, will help crack this problem.

Fish scales are formed from the same chemicals as bones and teeth and grow like tree rings, preserving a chemical record of the water the fish lived in throughout its whole life. Scales are easy to collect, and can be removed from fish without harming them which is important when studying an endangered population. The team discovered that levels of the trace metal manganese were always much higher in fish of farmed origin.

"This is probably caused by manganese supplements in fish food, and also because conditions underneath the fish cages promote recycling of manganese in the water column," says Dr Elizabeth Adey from SAMS, lead author on the research.

Using relatively simple techniques, the team was able to distinguish between farmed and wild fish with 98% accuracy.

"Because of its non-destructive nature, this technique could be used to assess the proportion of farm escape salmon present in any river, and therefore identify where additional conservation and wildlife protection measures are needed," says Dr Trueman, a geochemist with the University of Southampton's School of Ocean and Earth Science, based at that National Oceanography Centre.

Concern over declining numbers of wild Atlantic salmon has led to the closure of most fisheries, and the growth of salmon farms has been implicated in the decline of the wild fish. In 2000, more than 400,000 fish escaped from farms in Scotland. This is a problem as farmed salmon are not adapted to the local environment, and if they breed with the wild stock, the resulting offspring are less likely to survive to adulthood. In some years, the number of fish that escape from farms in Scotland exceeds the total number of wild fish, and in some Norwegian rivers more than half of all fish are of farmed origin.

It is particularly difficult to distinguish between a farm origin and wild origin fish if some time has passed after the fish escaped, and that is why the new method should prove valuable.

The team also found differences in the chemistry of scales between fish farms, which might allow researchers to identify individual farms responsible for the release of wild fish although this would require additional work.


'/>"/>

Contact: Dr. Rory Howlett
r.howlett@noc.soton.ac.uk
44-023-805-98490
National Oceanography Centre, Southampton (UK)
Source:Eurekalert

Related biology news :

1. New chemically-activated antigen could expedite development of HIV vaccine
2. 10th Functional Genomics: Chemical Biology 2009
3. SRI announces selection by the National Cancer Institute as a Chemical Biology Consortium center
4. Plastics chemical retards growth, function of adult reproductive cells
5. New way to make sensors that detect toxic chemicals
6. Scientists track chemical changes in cells as they endure extreme conditions
7. Chemicals in common consumer products may play a role in pre-term births
8. Kelvin Lee winner of Biochemical Engineering Journal Young Investigator Award
9. American Chemical Societys Weekly Presspac -- June 17, 2009
10. Chemical in blood may explain susceptibility to bladder pain
11. American Chemical Society weekly presspac -- June 10, 2009
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/15/2016)... 15, 2016 Yissum Research Development Company ... company of the Hebrew University, announced today the formation ... technology of various human biological indicators. Neteera Technologies has ... from private investors. ... detection of electromagnetic emissions from sweat ducts, enables reliable ...
(Date:3/14/2016)... March 14, 2016 http://www.apimages.com ... --> - Renvoi : image disponible via ... --> --> DERMALOG, le ... de nouveaux lecteurs d,empreintes digitales pour l,enregistrement des ... sera utilisé pour produire des cartes d,identité aux ...
(Date:3/11/2016)... India , March 11, 2016 ... a new market research report "Image Recognition Market by ... Application (Marketing and Advertising), by Deployment Type (On-Premises and ... Forecast To 2022", published by MarketsandMarkets, the global market ... 2015 to USD 29.98 Billion by 2020, at a ...
Breaking Biology News(10 mins):
(Date:5/3/2016)... ... May 03, 2016 , ... Flagship Biosciences, the leader ... to its Board of Directors. Dr. Gillett recently retired from Charles River Laboratories ... and Chief Scientific Officer. A board-certified veterinary pathologist, Dr. Gillett joined Charles River ...
(Date:5/3/2016)... ... May 03, 2016 , ... According to world renowned prostate ... prostate cancer treatment, patients traditionally had two main treatment options: surgery or radiation. Based ... made. , New technology has enabled doctors to administer higher doses of ...
(Date:5/2/2016)... (PRWEB) , ... May 02, 2016 , ... ... to report on the pre-launch success of their revolutionary, veterinarian-designed product for indoor ... to stalk, trap, and play with their food the way nature intended. NoBowls ...
(Date:4/29/2016)... ... April 29, 2016 , ... During a two day program ... viable company, CereScan’s CEO, John Kelley, joined other Denver business leaders in providing ... in the Denver area business community, shared his top fundamental learnings in building ...
Breaking Biology Technology: