Abundances and biological traits of the juveniles salmon sampled in the survey of Salmon abundance Indices in the Bresle river (France)
Citation
Josset Q, Lentieul J, Flesselle A, Macquet T, Petit L, Beaulaton L (2024). Abundances and biological traits of the juveniles salmon sampled in the survey of Salmon abundance Indices in the Bresle river (France). Version 1.8. Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE). Occurrence dataset https://doi.org/10.15468/chqxig accessed via GBIF.org on 2024-10-11.Description
A survey started in 2016 is conducted every year in early autumn (September to early october) to quantify the abundance of juvenile Atlantic salmon in the Bresle In Normandy. The electrofishing protocol of Prévost and Baglinière (1995) is used. It targets Atlantic salmon young of the year (0+ parr), but older fish (juvenile salmon ≥1+) are also caught and included in this dataset. Sampling is restricted to areas with shallow running water flowing on coarse bottom substrate, i.e. the preferred habitat of young of the year salmon. The data consist of abundance indices and biological traits measured on the fish sampled: length, weight and age. The latter is ascertained from scale samples taken from the fish which size does not allow to determine their age unambiguously. 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.Sampling Description
Study Extent
Bresle river, CdSandre=G01-0400 Source latitude and longitude : 49.6909, 1.7498 Last confluence point latitude and longitude : 50.0644, 1.37 The Bresle is a small coastal river that flows into the English Channel, in the commune of Le Tréport. 68.1 km separate in a straight line its source, in the commune of Abancourt in Oise (60) from its mouth. However, the particular hydrology of limestone substratum rivers, as well as the multiplication throughout the history of mills and other structures along its course, more than doubles the length of the actual watercourse. The river drains a watershed of nearly 748 km², composed mainly of a chalky substrate dating back to the upper Cretaceous. The basin has historically been marked by the glass industry, but also by the paper industry, as well as by gravel extraction. Agricultural practices that were once mainly focused on dairy farming and grazing are now shifting towards the production of maize, protein crops for livestock, and potatoes. Migratory salmonids can now reach the municipality of Saint-Germain-sur-Bresle, just over 50 km from the sea.Sampling
In the Bresle, sampling is conducted at 8 sites spread along the mainstem in the area of the hydrographic network colonized by Atlantic salmon. The sites are visited in 3 years, 2 in the first year, 4 in the second and 2 in the third year.Method steps
- Age is verified from scale reading according to standard methods described by (Baglinière and Le Louarn, 1987) and (Richard and Bagliniere, 1990).
- Fish capture was carried out with a backpack electrofishing equipment. The same gear was used since the beginning of the data collection, namely a Martin Pêcheur from DREAM Electronique, It is tuned to produce a pulsed DC with a 400 Hz frequency, 250-300 volts and a square-waveform between 4 and 10% duty cycle. Fishing is operated according to the following steps : 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 dip-nets 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. If necessary, the fish stuck on the bottom or in aquatic vegetation are recovered by a small hand net. 4. Individuals are transferred into a bucket previously filled with water. 5. The whole team moves laterally several meters out of the area that has just been disturbed by the electric field, the carrier of the electrofishing gear taking care of not to step on the area he will next explore with the anode. When a bank is reached, the progression is a few meters upstream. Then steps 1-5 are repeatedThe sampling at a given site stops after 5 minutes of actual fishing – i.e. the duration when 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 individuals captured for a unit effort (5 minutes of fishing under the conditions specified above). Biometric measurement of the fish are recorded after their anesthesia with benzocaïne. The fish length is measured from the tip of the mouth to the fork of the caudal fin (1 millimeter precision). Fish are then weighed (0.2 g precision) and maturity status is assessed by a gentle pressure on the belly that allows to get sperm in mature males. All the fish sampled are then released in their original site.
Additional info
This data set is intended to be updated annually.Taxonomic Coverages
-
Salmo salarrank: species
Geographic Coverages
The Bresle river in Normandy (France).
Bibliographic Citations
- 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. -
Contacts
Quentin Jossetoriginator
position: -
OFB DRAS, INRAE U3E, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement
Rue des Fontaines
Eu
76260
FR
Telephone: +33 (0)2 27 28 06 11
email: quentin.josset@ofb.gouv.fr
Jérôme Lentieul
originator
position: -
OFB DRAS, INRAE U3E, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement
Rue des Fontaines
Eu
76260
FR
Telephone: +33 (0)2 27 28 06 11
email: jerome.lentieul@ofb.gouv.fr
Aurélie Flesselle
originator
position: -
INRAE U3E, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement
Rue des Fontaines
Eu
76260
FR
Telephone: +33 (0)2 27 28 06 11
email: aurelie.flesselle@inrae.fr
Tony Macquet
originator
position: -
EPTB Bresle
Rue des Fontaines
Eu
76260
FR
Telephone: +33 (0)2 27 28 06 11
Laurent Petit
originator
position: -
OFB DRAS, INRAE U3E, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement
Rue des Fontaines
Eu
76260
FR
Telephone: +33 (0)2 27 28 06 11
Laurent Beaulaton
originator
position: -
OFB DRAS, INRAE U3E, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement
65 rue Saint Brieuc
Rennes
35042
FR
Telephone: 33 (0)2 23 48 56 64
email: laurent.beaulaton@ofb.gouv.fr
Quentin Josset
metadata author
position: -
OFB DRAS, INRAE U3E, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement
Rue des Fontaines
EU
76260
FR
Telephone: +33 (0)2 27 28 06 11
email: jerome.lentieul@ofb.gouv.fr
GBIF France
distributor
position: IT support
GBIF France
43 rue Buffon
Paris
75005
FR
Telephone: +33140798065
email: connexion@gbif.fr
Frédéric Marchand
administrative point of contact
position: -
INRAE U3E, Pôle OFB-INRAE-Agrocampus Ouest-UPPA pour la gestion des migrateurs amphihalins dans leur environnement
65 rue de St Brieuc, CS 84215
Rennes
35042
FR
Telephone: +33 223485786
email: frederic.marchand@inrae.fr