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Trout can tolerate river's poisons | This is Cornwall

Via http://www.thisiscornwall.co.uk/Brown-trout-tolerates-river-metal-toxins...

Trout can tolerate river's poisons

Thursday, August 01, 2013

The Cornishman

A RIVER so heavily polluted with toxins that it would kill most fish has been shown to support a population of brown trout.

The Hayle River, where heavy metals from the tin mining industry were carried out to sea, is among the most contaminated waterways in Britain, despite being an RSPB nature reserve.

The heavily polluted Hayle River which supports a population of gene-changing brown trout.

The heavily polluted Hayle River which supports a population of gene-changing brown trout.

New research from the University of Exeter and Kings College London has shown brown trout can survive in the river despite the high metal concentrations.

Eduarda Santos, one of the Exeter researchers, said it was being put down to changes in the expression of their genes.

He said: "The story of the brown trout is a fascinating one, demonstrating its resilience and its ability to defeat the odds and tolerate the challenges imposed upon them as a result of human activities. Many aspects of this story remain untold, however.

"We do not know how or when this tolerance arose or what the future holds for them if challenged with further stressors in their environment.

"But we know that such populations need careful management. If the Hayle brown trout, with their unique physiology, were to be lost, it is possible this river may never be home to brown trout again.

"Understanding the relationship of fish with their environment is crucial to effectively managing and protecting our aquatic ecosystems."

Tamsyn Uren Webster, from Exeter University, said: "The work demonstrates that this population of brown trout has developed strategies for dealing with the metal pollution in the water and accumulation in their tissues, avoiding the lethal damage that such concentrations of metals would normally cause."

The researchers compared the trout with a population in a relatively clean site in the River Teign in Devon.

Results showed the accumulation of metals in the kidney and liver – where metals are stored and detoxified – were 19 and 34 times higher in the Hayle trout, respectively. In the gill, concentrations averaged 63 times higher in the Hayle fish.

The team believed a detailed understanding of how the Hayle trout population has developed this tolerance could have potential implications for restocking rivers.

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TitleCreated
PA18/05585 | Application for Refurbishment and conversion of Loggans Mill building into 16 apartments, including internal and ex 7 hours 48 min agoBook page
1939 | Fire lit at Angarrack | May Day Celebrating at Hayle 8 hours 15 min agoBook page
1933 | LICENSED PREMISES TO LET. TIHE ANGARRACK INN. near Hayle. Rent and ingoing moderate. Suit a pensioner. Apply The Brewery, 8 hours 27 min agoBook page
1934 | Villagers' Initiative Spirit Of Self-Help at Angarrack Old Mill converted into Institute 9 hours 16 min agoBook page
1934 | Whist | It is interesting to note that this is the first time in history that whist drive has been held in Angarrack 9 hours 19 min agoBook page
1841 | Having been offered for sale at Angarrack Smelting House the Goth of a refiner put it at once into a ladle and melted 5 days 6 hours agoBook page
1894 September 6 | Two Men Killed At Hayle Dynamite Works 5 days 10 hours agoBook page
180705 | 47 CONSULTATION – TO CONSIDER AND COMMENT UPON THE LOCAL GOVERNMENT BOUNDARY COMMISSION’S ELECTORAL REVIEW OF CORNWALL: 1 week 6 days agoBook page
180801 | Hayle Mayor Slams Boundary Changes | Hayle Town Council 1 week 6 days agoBook page
1880 | There is a report current that the smelting-works at Angarrack will shortly cease operations, but all hope that it is a r 2 weeks 23 hours agoBook page
1930 | A bazaar was held at Angarrack, Hayle, on Monday, in aid of the Wesleyan chapel renovation scheme 2 weeks 23 hours agoBook page
1791 | About one mile East of the copper-works is the village of Angarrack | The Universal British Directory, Camborne 2 weeks 23 hours agoBook page

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