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Abundances and biological traits of the juveniles lamprey sampled in the survey of lamprey abundance Indice on the Oir river (France)

Dataset homepage

Citation

Tremblay J, Marchand F, Azam D, Delanoë R, Destouches J, Prévost E (2025). Abundances and biological traits of the juveniles lamprey sampled in the survey of lamprey abundance Indice on the Oir river (France). Version 1.5. Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE). Occurrence dataset https://doi.org/10.15468/8re37s accessed via GBIF.org on 2025-06-16.

Description

A survey started in 2009 is conducted every year in autumn (late September to early October) to quantify the abundance of juvenile lamprey in the Oir river in Normandy. This method uses a rectangular dredge to sample a constant and small surface of sediments in soft substrate areas. It targets all lamprey species. The data consist of abundance indices and biological traits measured on the fish sampled:length and weight. The survey is carried out under the Research Observatory on Diadromes Fishes in Coastal Streamss (ERO DiaPFC) program. The data are stored in the database of the ERO. They are used to develop predictive models and tools for providing scientific advice to improve the management of this heritage species.

Purpose

Monitoring of juvenile recruitment in lamprey on the Oir river

Sampling Description

Study Extent

Oir river, CdSandre=I9280600 Latitude between 48.6840 and 48.5985; longitude between -1.2949 and -1. 0994 Source latitude and longitude : 48.6667 -1.1138 Last confluence point latitude and longitude : 48.6305 -1.2943 Oir river is located at the southern edge of Normandy. It is a tributary of the Sélune, a coastal stream flowing into the Bay of Mont Saint-Michel. The Oir is 21 km long, and has an average gradient of 11 ‰. Its drainage area is 87 km², dominated by sedimentary schist land and corneal including some granitic enclaves. The water pH is near neutral and of reasonably good quality but with high nitrate concentrations. Human activities and land use are mainly from agriculture. The upper Sélune is not accessible to migratory fish. They are blocked at fifteen kilometers from the sea by a dam. The Oir, with 12 km accessible to Atlantic salmon, is the main spawning and most productive tributary of the Sélune hydrographic network.

Sampling

In the Oir, sampling is conducted at 4 sites spread along the mainstem. The sites are visited once a year in autumn (end of September to early October).

Method steps

  1. From Lasne 2019 : The method is derived from Surber stream bottom sampler for. The frame is pushed into the substrate (maximum 15 cm deep, depending on soft substrate layer thickness) and the operator uses hands, protected by gloves, to gently dredge the substrate into the net until the substratum is removed. Thereafter, remaining sediments and larvae are dipnetted and transferred into a large sieve (1 mm mesh, about 0.4–0.5 m2). For better efficiency, the dipnet should be almost as wide as the bottom sampler. The net of the bottom sampler is removed and the dredged sediment is transferred into the sieve to be cleaned out and to sort out the larvae. Biometric measurement of the fish are recorded after their anesthesia with benzocaïne. The fish length is measured (1 millimeter precision) then weighed (0.2 g precision). All the fish sampled are then released in their original site.

Additional info

This data set is intended to be updated annually

Taxonomic Coverages

  1. Lampetra planeri
    common name: Lamproie de planer rank: species
  2. Lampetra fluviatilis
    common name: Lamproie de rivière, Lamproie fluviatile rank: species
  3. Petromyzon marinus
    common name: Lamproie marine rank: species

Geographic Coverages

The Oir river in Normandy (France). http://services.sandre.eaufrance.fr/Courdo/Fiche/client/fiche_courdo.php?CdSandre=I9280600

Bibliographic Citations

  1. Lasne, E., M.-R. Sabatié, J. Tremblay, L. Beaulaton, et J.-M. Roussel. « A new sampling technique for larval lamprey population assessment in small river catchments ». Fisheries Research 106, nᵒ 1 (octobre 2010): 22‑26. https://doi.org/10.1016/j.fishres.2010.06.011. -

Contacts

Julien Tremblay
originator
position: Researcher
INRAE, Pole OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, U3E, F-35042, Rennes, France.
65 rue de St Brieuc, CS 84215
Rennes
35042
FR
Telephone: +33 223485786
email: Julien.Tremblay@inrae.fr
Frédéric Marchand
originator
position: Researcher
INRAE, Pole OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, U3E, F-35042, Rennes, France.
65 rue de St Brieuc, CS 84215
Rennes
35042
FR
Telephone: +33 223485786
email: frederic.marchand@inrae.fr
Didier Azam
originator
position: Researcher
INRAE, Pole OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, U3E, F-35042, Rennes, France.
65 rue de St Brieuc, CS 84215
Rennes
35042
FR
Telephone: +33 223485786
email: Didier.Azam@inrae.fr
Richard Delanoë
originator
position: Researcher
OFB DRED, INRAE U3E, Pôle AFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement
Le moulin de Cerisel
Ducey
50220
FR
Telephone: 0688155198
email: richard.delanoe@ofb.gouv.fr
Jean-Pierre Destouches
originator
position: Researcher
INRAE, Pole OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, U3E, F-35042, Rennes, France.
65 rue de St Brieuc, CS 84215
Rennes
35042
FR
Telephone: +33 223485786
email: Jean-Pierre.Destouches@inrae.fr
Etienne Prévost
originator
position: Researcher
INRAE ECOBIOP, Pôle AFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement
Aquapôle - Ibarron
St-Pée-sur-Nivelle
64310
FR
Telephone: +33559515983
email: Etienne.Prevost@inrae.fr
Frédéric Marchand
metadata author
position: Researcher
INRAE, Pole OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, U3E, F-35042, Rennes, France.
65 rue de St Brieuc, CS 84215
Rennes
35042
FR
Telephone: +33 223485786
email: frederic.marchand@inrae.fr
Nadine Herrard
programmer
position: Researcher
INRAE, Pole OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, U3E, F-35042, Rennes, France.
65 rue de St Brieuc, CS 84215
Rennes
35042
FR
Telephone: +33 223485786
email: Nadine.Herrard@inrae.fr
GBIF France
distributor
position: IT support
GBIF France
MNHN Geologie CP48, 43 rue Buffon
Paris
75005
FR
email: connexion@gbif.fr
homepage: http://www.gbif.fr
Frédéric Marchand
administrative point of contact
position: Researcher
INRAE, Pole OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, U3E, F-35042, Rennes, France.
65 rue de St Brieuc, CS 84215
Rennes
35042
FR
Telephone: +33 223485786
email: frederic.marchand@inrae.fr
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