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V2LWATCH: The Wash Animal Tracking Hub
Citation
Bolland, D. 2015. The Wash Animal Tracking Hub
Contact: Bolland, Jon ;

Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution 4.0 International License.

Description
This study is divided into the following specific objectives: i) Determine the catchment-wide downstream migration of silver eels in relation to environmental conditions (river flow, water temperatures, lunar phase and time of day) and pumping station operation using acoustic tags and receivers. Ii) Determine the initial marine phase migration of silver eel captured in freshwater, tagged and released downstream of the pumping station. Iii) Assess the impact of passage through pumping stations on the initial marine phase of the eel migration. The information gained will provide valuable guidance for optimising escapement of adult eels, in line with EU requirements, at the respective study sites. more

Recruitment of the European eel (Anguilla anguilla) has reduced by greater than 90% since the early 1980's in some parts of Europe, and the stock is now considered outside safe biological limits. Exact causes of the decline remain unclear; however, riverine barriers to seaward migrating adult eels (silver eels hereafter) are considered a key factor. Specifically, intake screens, pumps and turbines at pumping stations for domestic supply, agriculture and industry, flood control and hydropower generation, can result in the delay or cessation of migration, physical damage and direct mortality of silver eels due to their elongated morphology and poor burst swimming capabilities. For those that do survive, little is known about the impact on the marine phase of silver eel migration. In fact, little is known about the marine phase of silver eel migration generally. To reverse the decline in European eel populations, the European Union has adopted the Eel Recovery Plan (Council Regulation No 1100/2007/EC). This requires all Member States to produce Eel Management Plans (EMPs) detailing actions to meet the target to permit with high probability the escapement to sea of at least 40% of the silver eel biomass relative to the best estimate of escapement that would have existed if no anthropogenic influences had impacted the stock. Mitigation for the effects of riverine barriers and improvements to downstream passage has been highlighted as a key means of achieving escapement targets across Europe (e.g. U.K., Denmark, Greece EMPs). Furthermore, under the EU Water Framework Directive (WFD) (2000/60/EC) member states are obliged to ensure fish passage at all artificial structures. To meet legislative escapement targets it is important to identify key locations of silver eel loss during freshwater migration. This has led to an ongoing investigation into silver eel migration and entrainment in three rivers that enter The Wash, England. The downstream limit of the study is current the tidal limit. With the support of the OTN a line of receivers will be deployed across the mouth of The Wash to investigate the initial marine phase of the eel migration. To this end, the study will be divided into the following specific objectives: i) Determine the catchment-wide downstream migration of silver eels in relation to environmental conditions (river flow, water temperatures, lunar phase and time of day) and pumping station operation using acoustic tags and receivers. Ii) Determine the initial marine phase migration of silver eel captured in freshwater, tagged and released downstream of the pumping station. Iii) Assess the impact of passage through pumping stations on the initial marine phase of the eel migration. The information gained will provide valuable guidance for optimising escapement of adult eels, in line with EU requirements, at the respective study sites. In addition, the Environment Agency and national conservation organisations will be able to use these outputs to inform, underpin and revise policy and conservation practices to deliver appropriate protection for the species nationally.

Scope
Themes:
Biology, Biology > Acoustics, Biology > Ecology - biodiversity, Biology > Fish
Keywords:
Marine/Coastal, Fresh water, Brackish water, Acoustic arrays, Acoustic data, Acoustic telemetry, Anthropogenic factors, Barriers, Eel stocks, Environmental conditions, Escapement, European eels, Fish migration, Fish migration bottleneck, Fish movement, Management planning, Migration barriers, River systems, Survivability, ANE, British Isles, England, Lincolnshire Coast, ANE, British Isles, England, Norfolk, Anguilla anguilla (Linnaeus, 1758), Pisces

Geographical coverage
ANE, British Isles, England, Lincolnshire Coast
ANE, British Isles, England, Norfolk [Marine Regions]

Temporal coverage
1 October 2015 - 31 July 2017

Taxonomic coverage
Anguilla anguilla (Linnaeus, 1758) [WoRMS]
Pisces [WoRMS]

Parameter
Fish detections Methodology
Fish detections: Acoustic telemetry

Contributors
University of Hull, moredata creator

Related datasets
Parent dataset:
European Tracking Network (ETN) data, more


Dataset status: Completed
Data type: Data
Data origin: Research: field survey
Metadatarecord created: 2021-12-21
Information last updated: 2022-10-05
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