Survey of freshwater pearl mussel in Lysakerelva, Norway

Sampling event
Latest version published by NaturRestaurering AS on Mar 1, 2024 NaturRestaurering AS
Publication date:
1 March 2024
Published by:
NaturRestaurering AS
CC-BY 4.0

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In March 2023, freshwater pearl mussels was re-located in the Lysaker river. The relocation was carried out as a precautionary measure because the discharge of injection compounds from the tunnel work at Fornebubanen can cause damage/mortality to occurrences of mussel in the area of influence. Fornebubanen is obliged to monitor the mussel population in the river and report annually to the State Administrator on the condition. On behalf of Fornebubanen, NaturRestaurering AS has carried out a survey in June 2023.

Data Records

The data in this sampling event resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 50 records.

1 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.

Event (core)

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How to cite

Researchers should cite this work as follows:

Løkken J O (2024). Survey of freshwater pearl mussel in Lysakerelva, Norway. Version 1.2. NaturRestaurering AS. Samplingevent dataset.


Researchers should respect the following rights statement:

The publisher and rights holder of this work is NaturRestaurering AS. This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 1ae3e942-d8ed-4583-b2fa-91ed7f1f64ed.  NaturRestaurering AS publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Norway.


Samplingevent; Observation


Jørn Olav Løkken
  • Metadata Provider
  • Curator
  • Originator
  • Point Of Contact
Senior advisor
NaturRestaurering AS
Sigurd Toverud
  • Content Provider
NaturRestaurering AS
Kjetil Flydal
  • Principal Investigator
Senior Advisor
NaturRestaurering AS

Geographic Coverage

The survey was conducted along a 500 meter stretch of the Lysaker river.

Bounding Coordinates South West [59.915, 10.632], North East [59.918, 10.634]

Temporal Coverage

Start Date 2023-06-08

Project Data

No Description available

Title Re-location and survey of freshwater pearl mussel in Lysakerelva

Sampling Methods

The survey is conducted by personal observations performed by freshwater ecologists. Density of freshwater pearl mussels was recorded per m2 at stations along a transect in the river. Due to depths which in some cases do not make wading possible, the work was carried out by snorkelling, where the density and condition of mussels were recorded within different zones of the river and recorded continuously in maps (Arcgis fieldmaps). A Gopro camera was used for photo documentation.

Study Extent The survey was conducted along a 500 meter stretch along the Lysaker river

Method step description:

  1. - Snorkling along a river transect - Recording density of mussels per m2 at stations along the transect - Data recorded in ArcGis fieldmaps and exported to darwinCore

Additional Metadata

Alternative Identifiers 1ae3e942-d8ed-4583-b2fa-91ed7f1f64ed