Glasaalmigratie - Glass eel migratio…

Occurrence dataset published by Research Institute for Nature and Forest (INBO)

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Summary

Full Title

Glasaalmigratie - Glass eel migration in the river Yser

Description

The dataset contains data from glass eel that was captured with drag and lift nets during rising tide. This to study their distribution over the area. A fyke was used to investigate the influence of limited drainage opening during rising tide on elver migration.

Purpose

the presented data may contribute to restoration of eel populations worldwide and be of interest to a wide range of river managers and stakeholders

Temporal coverages

Date range: Mar 30, 2009 - Apr 10, 2009

Language of Data

 

Administrative contact
Ans Mouton Mouton
Researcher
Research Institute for Nature and Forest (INBO)
Kliniekstraat 25, Brussels, Brussels Capital Region BE, 1070 1070 Brussels Brussels Capital Region Belgium
Metadata author
Ans Mouton
Researcher
Research Institute for Nature and Forest (INBO)
Kliniekstraat 25 1070 Brussels Brussels Capital Region Belgium
Originator
Ans Mouton
Researcher
Research Institute for Nature and Forest (INBO)
Kliniekstraat 25 1070 Brussels Brussels Capital Region Belgium

Published by

Research Institute for Nature and Forest (INBO)

Publication Date

Aug 8, 2013

Registration Date

Jan 10, 2013

Served by

INBO IPT

Alternative Identifiers

External Data

Metadata Documents

Taxonomic Coverage

All records in this dataset are European eel (Anguilla anguilla).

CLASS
Actinopterygii (ray-finned fishes)
SPECIES
Anguilla anguilla (European eel)

1,171 Georeferenced data

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Description

The river Yser, Flanders, Belgium. The Yser basin covers an area of 1101 km² and 32 km of the river is located in more

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Geographic Coverage

The river Yser, Flanders, Belgium. The Yser basin covers an area of 1101 km² and 32 km of the river is located in France and Belgium.The basin is known as an important area for European eel, providing valuable habitats for growth and development (Denayer & Belpaire 1996). The Yser is a river that originates in French Flanders (the north of France), enters the Belgian province of West Flanders and flows into the North Sea at the town of Nieuwpoort. (http://en.wikipedia.org/wiki/Yser)

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Study area description

European eel Anguilla anguilla (L.) populations have declined dramatically during the last decades and are now among the most critically endangered fish populations in Europe. The limitation of upstream migration of glass eels is considered to be one of the key factors reducing eel populations. The migration of eels in their juvenile stage (glass eels) was studied, and options to improve eel passage at a tidal barrier complex at the mouth of the Yser River, Flanders,Belgium, were assessed. Glass eels were sampled during tidal rise with stow nets and lift nets to analyse their distribution over the study area, while a fyke net was used to evaluate the impact of limited barrier opening on glass eel migration. Support-vector machine-based analysis of the lift net data indicated that migrating glass eels are attracted by the fresh water flow leaking from the barriers, whereas other variables such as the sampling location only had a weak influence on the glass eel density. Limited barrier opening during tidal rise appeared to be a cost-efficient and effective mitigation option to improve upstream glass eel migration without significant intrusion of seawater. Adjusted barrier management could often be implemented and applied on numerous tidal barriers. Therefore the results of this research are of interest to a wide range of river managers and stakeholders and may contribute to the conservation of many eel populations.

Funding

Waterwegen en Zeekanaal NV (W&Z) - http://www.wenz.be/en/

Project Personnel

Point of contact
Ans Mouton

Associated parties

Processor
Peter Desmet
LifeWatch coordinator
Research Institute for Nature and Forest (INBO)
Kliniekstraat 25 1070 Brussels Brussels Capital Region Belgium
Processor
Dimitri Brosens
Data liaison officer
Research Institute for Nature and Forest (INBO)
Kliniekstraat 25 1070 Brussels Brussels Capital Region Belgium
Point of contact
Ans Mouton
Researcher
Research Institute for Nature and Forest (INBO)
Kliniekstraat 25 1070 Brussels Brussels Capital Region Belgium

Methodology

Study extent

Estuary of the river Yser

Sampling description

Glass eel were sampled during tidal rise with stow nets and lift nets to study their distribution over the study area, while a fyke net was used to evaluate the impact of limited barrier opening on glass eel migration.

Quality control

"All records are validated."

Method Steps

  1. one step at a time