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Elvers by Dr. Will O'ConnorJun 19, 201610:15 amOctober 20, 2017
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Elvers running at Ennistymon Falls, June 2016.

Elvers running at Ennistymon Falls during early June 2016. This is a difficult obstacle for #eels. There is a salmon pass in the middle of the falls and during low flows all the water is […]

Elvers by Dr. Will O'ConnorJun 12, 201610:35 amMay 7, 2017
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Elver run at Ardnacrusha, June 2016

Critically endangered juvenile #eels trying to find a way upstream at Ardnacrusha hydro station on the Lower River Shannon, June 2016. Elvers can’t find this trap/pass. The spillway beside this trap is far more attractive […]

Eel management plan by Dr. Will O'ConnorMay 14, 20169:50 amJanuary 14, 2017
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Ireland’s Eel Management Plan – a poor deal for eels

Ireland’s Eel Management Plan – a poor deal for eels. Action 3a: Castletown Weir 2015. This is the new rock ramp fish pass at Castletown Weir on the River Nore. This provides a local improvement […]

Elvers by Dr. Will O'ConnorMar 12, 20166:47 pmMarch 13, 2016
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As few as 2% of elvers may pass Shannon dams

It has recently been reported by Ireland’s independent scientific committee on salmon that the numbers of Annex II listed Atlantic salmon passing the dams on the River Shannon is less than 5% of the conservation […]

Eel management plan by Dr. Will O'ConnorFeb 23, 201610:31 pmOctober 19, 2017
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Monitoring silver eel turbine passage mortalities on the Lower Shannon

We are currently assessing silver eel turbine passage mortality at Ardnacrusha hydroelectric station on the Lower River Shannon. Silver eels are adult maturing eels on their spawning migration to the Sargasso Sea after spending up to 20 years (or […]

American eel by Dr. Will O'ConnorDec 3, 20159:24 amMarch 13, 2016
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Genetic analysis of the American eel helps explain its decline

An interesting paper entitled ‘RAD Sequencing Highlights Polygenic Discrimination of Habitat Ecotypes in the Panmictic American Eel‘ was recently published in the journal Current Biology by Scott A. Pavey et al. (2015). This study has found that there are differences […]

Eel management plan by Dr. Will O'ConnorJun 9, 201511:34 amFebruary 25, 2017

“Alternative facts” from the Standing Scientific Committee on Eels

Eel recovery plan by Dr. Will O'ConnorApr 23, 20156:36 pmMarch 13, 2016
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Historical data to plan the recovery of the European eel

A new interesting paper has been accepted by the Journal of Applied Ecology entitled ‘Historical data to plan the recovery of the European eel‘. The authors are Miguel Clavero and Virgilio Hermoso who use historical sources to reconstruct the historical […]

Elvers by Dr. Will O'ConnorApr 12, 20157:05 pmMarch 13, 2016
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Salmon counters – unnecessary eel migration barriers?

Instead of opening up migration pathways for eels (and lampreys) in Ireland, our state agency Inland Fisheries Ireland (IFI) are, themselves, a major threat to eel and lamprey populations. In 2013 IFI installed this crump […]

Elvers by Dr. Will O'ConnorApr 12, 20155:45 pmMarch 13, 2016
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Ireland’s elver monitoring sites not operating again

We are very disappointed to report that many of Ireland’s national elver monitoring sites are not operational again this year in time for the elver run. This weekend we visited Inland Fisheries Ireland’s elver monitoring […]

Silver eels by Dr. Will O'ConnorMar 26, 201512:55 pmMarch 13, 2016
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Endoparasites affect eel swimming behaviour

A new paper entitled ‘Relationship between European eel Anguilla anguilla infection with non-native parasites and swimming behaviour on encountering accelerating flow‘ has just been published in the Journal of Fish Biology by Lynda Newbold et al. It examines […]

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