[env-trinity] CBB: Treating anxious outmigrating salmon

[David Webb]

If I knew that my best friend was a fisherman I'd be pretty anxious too.

Dave


On 12/9/2016 7:03 PM, Kier Associates wrote:
>
> Baby salmon ain’t the only ones with anxiety disorder these days – the 
> only news you can trust, /The Bad Reporter/, just delivers one 
> nail-biter after another http://www.gocomics.com/badreporter
>
> Bill
>
> *From:*env-trinity 
> [mailto:env-trinity-bounces+kierassociates=att.net at velocipede.dcn.davis.ca.us] 
> *On Behalf Of *Sari Sommarstrom
> *Sent:* Friday, December 09, 2016 2:28 PM
> *To:* env-trinity at velocipede.dcn.davis.ca.us
> *Subject:* [env-trinity] CBB: Treating anxious outmigrating salmon
>
> Columbia Basin Bulletin
>
> Print this Story Print this Story 
> <http://www.cbbulletin.com/438064.aspp> Email this Story Email this 
> Story <http://www.cbbulletin.com/Email_EmailContent.aspx?id=438064>
>
> *Study Treats Migrating Salmon With Anxiety Medication, Says Limits 
> Fear Of The Unknown Downstream *
> Posted on Friday, December 09, 2016 (PST)
>
> Current research from Umeå University in Sweden shows that the young 
> salmon's desire to migrate to the sea can partly be limited by anxiety.
>
> Researchers have long tried to understand what factors affect the 
> young salmon's decision to migrate out to sea. Previous studies have 
> indicated that environmental factors such as temperature, light 
> conditions and water flow may play an important role. However, large 
> parts of the within species variation in fish migration remains 
> unexplained.
>
> A study http://www.nature.com/articles/ncomms13460__from Umeå 
> University, published in the journal Nature Communications, now shows 
> that the salmon's inclination to migrate is partly limited by its fear 
> of the unknown downstream.
>
> "By treating salmon with an anxiolytic drug, anxiety medication that 
> is, we artificially changed the migration intensity of the salmon 
> where treated salmon travelled further and faster than untreated 
> salmon," says Gustav Hellström, one of the researchers behind the study.
>
> The research team studied how salmon migration was affected both in a 
> lab, where salmon migrated in a large artificial stream, and in a 
> natural stream outside of Umeå in Northern Sweden. In both 
> environments, researchers found that salmon treated with anxiety 
> medication migrated nearly twice as fast as salmon who had not been 
> subjected to treatment.
>
> Several billion animals migrate yearly and the study results show that 
> anxiety limits migration intensity, is not only important for 
> understanding salmon migration but also for understanding migration in 
> general, says the study.
>
> The study also has an ecotoxicological dimension as the quantity of 
> medication that the salmon was exposed to was low - in fact so low 
> that it measured lower than that found in wastewater in certain areas.
>
> "Even though salmon in Northern Sweden live in river-systems low to 
> moderately affected by contaminated wastewater it is not very likely 
> that exposure to anxiety medication is an environmental issue for 
> these populations right now. However, given the low dose used in the 
> study we cannot rule out that, with increasing human population and 
> medical use, this might become a problem in the near future" says 
> Hellström.
>
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