Abundances and biological traits of the juveniles salmon sampled in the survey of Salmon abundance Indices in the Oir river (France)

Frédéric Marchand1, Didier Azam1, Richard Delanoë2, Jean-Pierre Destouches3, Julien Tremblay3, Etienne Prévost4, Nadine Herrard5, GBIF France6

1 INRAE U3E, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, 65 rue de St Brieuc, CS 84215, 35042, Rennes, France; 2 OFB DRAS, INRAE U3E, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, Le moulin de Cerisel, 50220, Ducey; 3 INRAE U3E, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, 65 rue de St Brieuc, CS 84215, 35042, Rennes; 4 INRAE ECOBIOP, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, Aquapôle - Ibarron, 64310, St-Pée-sur-Nivelle, France; 5 INRAE ECOBIOP, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement, 65 rue de St Brieuc, CS 84215, 35042, Rennes, France; 6 GBIF France, 43 rue Buffon, 75005, Paris

Corresponding author(s): Frédéric Marchand (frederic.marchand@inrae.fr)Didier Azam (Didier.Azam@inrae.fr)Richard Delanoë (richard.delanoe@ofb.gouv.fr)Jean-Pierre DestouchesJulien TremblayEtienne Prévost (Etienne.Prevost@inrae.fr)

Received {date}; Revised {date}; Accepted {date}; Published {date}

Citation: Combination of authors, year of data paper publication (in parentheses), Title, Journal Name, Volume, Issue number (in parentheses), and doi of the data paper.

Resource Citation

Marchand F, Azam D, Delanoë R, Destouches J, Tremblay J, Prévost E (2022): Abundances and biological traits of the juveniles salmon sampled in the survey of Salmon abundance Indices in the Oir river (France). v1.22. Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE). Dataset/Occurrence. http://ipt.gbif.fr/resource?r=dataset_inra_rennes&v=1.22

Abstract

Since 1993, an annual campaign is conducted to quantify the abundance of juvenile Atlantic salmon in the Oir basin. It is usually done in September  and according to the protocol of Prévost and Baglinière (1995). The electric fishing protocol of Prévost and Baglinière (1995) is used, which is specific to Atlantic salmon young of the year (0+ parr) . Sampling is restrited to areas with shallow running water flowing on coarse bottom substrate i.e. the preferred habitat of young of the year salmon.This data set consists of the abundance and biological traits measured on the fish sampled on this occasion. Observations made on this occasion are descriptive data (species, sex, maturation and biometric (length, weight). In addition, scales samples are taken to determine the age of the fish.

Keywords: Occurrence, Population density, population distribution, catch effort, salmo salar, salmon, Occurrence

General description

Additional information: This data set is intended to be updated annually

Project details

Project title: Observatoire de Recherche en Environnement des poissons diadromes sur les Fleuves Côtiers - Ecological  Research Observatory on Diadromous Fish in coastal streams
Personnel: Etienne Prévost
Funding: Funding

- INRAE : French National Institute for Agricultural, Food en Environment Research

- OFB : French Office for Biodiversity - FEAMP : (European Fund for Maritime Affairs and Fisheries).

- Since 2017, data collected on salmon in the framework of the ORE DiaPFC have been included in the national program for the data collect in support of scientific advice for the Common Fisheries Policy for the European regulations on fisheries management. In this context, INRAE and OFB contribute to the National Work Program piloted by the DPMA of the Ministry of the Environment. This program is financially supported by FEAMP.
Study area descriptions/descriptor: This infrastructure Research relies on three coastal streams of the Atlantic facade Channel, the Bresle and Oir in Normandy (Manche), the Scorff in Brittany (Morbihan) and the Nivelle in the Basque Country (Pyrenees Atlantiques).
Design description: The issue of 'Research Observatory on Diadromes Fish in Coastal Rivers (ORE DiaPFC) is to study the evolution of diadromous fish populations as a result of environmental changes (climate change and changes related to agriculture ) that affect these rivers.

Data published through GBIF: http://ipt.gbif.fr/resource?r=dataset_inra_rennes

Taxonomic coverage

Taxonomic ranks
Species: Salmo salar
Common names: Saumon atlantique, Atlantic Salmon

Spatial coverage

General spatial coverage: The Oir river in Normandy (France). http://services.sandre.eaufrance.fr/Courdo/Fiche/client/fiche_courdo.php?CdSandre=I9280600
Coordinates: 48°36'0''N and 48°40'48''N Latitude; 1°17'24''W and 1°6'0''W Longitude 

Temporal coverage: October 15, 1993 - September 14, 2021

Natural collections description

Collection name: Banque de données d'échantillons ichtyologiques (BDEI)
Collection identifier: http://147.99.222.8:8080/BDEI/
Specimen preservation method: Dried
Specimen preservation method: No treatment
Specimen preservation method: Other
Curatorial unit: Between 2207 and 2207 (Scales)
Curatorial unit: Between 382 and 382 (Fins)

Methods

Method step description: 
- . 	Juveniles salmon are caught by electric fishing. A 400 Hz pulsed current generator (Martin Pêcheur of DREAM Electronique) is used and it is proceeded as follows: 	
1	Two large dip-nets with metal frames are placed facing the current, lying on the bottom, and kept at a fixed position.  
2	The anode scans an area of about 4-5 m upstream of the dipnet in the vein of water filtered by them. 
3	Fish attracted by the anode and shocked go down into the nets guided by the electrode and driven by the water flow. 
4	If necessary, the fish stuck on the bottom or in aquatic vegetation are recovered by a small hand net. 5 - Individuals are transferred into a bucket previously filled with water. The whole team moves laterally several meters (the carrier of the martin fisherman taking care not to step on the area he will next explore with the anode) out of the area that has just been disturbed by the electric field, then steps 1-5 are repeated. When one bank is reached, the progression is a few meters upstream. 
5	The sampling at a given site stops after 5 minutes of actual fishing time - ie during which the electric field is applied in the water - measured directly on the counter of the electric fishing equipment. Juvenile abundance is quantified by the number of 0+ captured for a unit effort (5 minutes of fishing under the conditions specified above).
- . 	Age is verified from scale reading according to standard methods described by Baglinière and Le Louarn (1987) and Richard and Baglinière (1990).
Study extent description: 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 in the south of the Manche department, the Oir is a tributary of the Sélune, small Normandy coastal river flowing into the Bay of Mont Saint-Michel. The course of the Oir, long 21 km, east west, has an average gradient of 11 ‰. Its watershed of 87 km², dominated by sedimentary schist land and corneal including some granitic enclaves. The water is near neutral and reasonable quality but with high nitrate levels. On this basin, human activities are mainly from agriculture (meadows, fodder crops, dairy cattle). The upstream Sélune is not accessible to migratory fish. They are blocked to fifteen kilometers from the sea by a dam. Oir river, with its 12 Km accessible to migratory fish spawning tributary is the most productive of the network
Sampling description: Sampling is conducted at 10 sites spread over the mainstem and over the 2 main tributaries in the area of the Oir hydrographic network colonized by Atlantic salmon. Since 2016, 1 site is sampled over the network colonized by Atlantic salmon to vérify this limit. The sites are the same every year and are visited once a year in the beginning of autumn (September).

Datasets

Dataset description
Object name: Darwin Core Archive Abundances and biological traits of the juveniles salmon sampled in the survey of Salmon abundance Indices in the Oir river (France)
Character encoding: UTF-8
Format name: Darwin Core Archive format
Format version: 1.0
Distribution: http://ipt.gbif.fr/archive.do?r=dataset_inra_rennes
Publication date of data: 2022-03-21
Language: French
Licences of use: Creative Commons Attribution (CC-BY) 4.0 License

Metadata language: English
Date of metadata creation: 2016-08-31
Hierarchy level: Dataset

References
Prévost E., Baglinière J.-L., 1995. Présentation et premiers éléments de mise au point d'une méthode simple d'évaluation du recrutement en juvéniles de saumon atlantique (Salmo salar) de l'année en eau courante, p. 39-48. In Gascuel D., Durand J.L., Fonteneau A., (Eds.) Les recherches françaises en évaluation quantitative et modélisation des ressources et des systèmes halieutiques. Colloques et séminaires, ORSTOM éditions, Paris.
Prévost E., Nihouarn A., 1999. Relation entre indicateur d'abondance de type CPUE et estimation de densité par enlèvements successifs pour les juvéniles de saumon atlantique (Salmo salar L.) de l'année. Bull. Fr. Pêche Piscic., 352 : 19-30.
Baglinière, J. L., and Le Louarn, H. 1987. Caractéristiques scalimétriques des principales espèces de poissons d’eau douce de France. Bulletin Français de la Pêche et de la Pisciculture: 1–39.
Richard, A., and Bagliniere, J. L. 1990. Description et interprétation des écailles de truites de mer (Salmo trutta L.) de deux rivières de Basse-Normandie : l’Orne et la Touques. Bulletin Français de la Pêche et de la Pisciculture: 239–257.
Marchand, F. et al (2017). Abundance indices and biological traits of juvenile salmon (Salmo salar) sampled in three rivers on the Atlantic and Channel coasts (France). Biodiversity Data Journal 5, e15125.