Sea trout entering the rivers Adour and Nivelle in south-west France at the start of the 21st century

Data Records

The data in this occurrence 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 1,257 records.

2 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.

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.

Versions

The table below shows only published versions of the resource that are publicly accessible.

How to cite

Researchers should cite this work as follows:

CHAT J, AYMES J, LANGE F, CARLUT E, BARRACOU D (2019): Sea trout entering the rivers Adour and Nivelle in south-west France at the start of the 21st century. v1.8. Institut National de la Recherche Agronomique (INRA). Dataset/Occurrence. http://ipt-recette.gbif.fr/resource?r=seatrout_gascony_2002-2013&v=1.8

Rights

Researchers should respect the following rights statement:

The publisher and rights holder of this work is Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE). 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: c17268a5-7aa6-4877-9019-aaa45f210c81.  Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE) publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF France.

Keywords

occurrence; migratory species; anadromous species; dam; fish ladder; trapping; fish scales; body length; colouration; ectoparasite; observation; Occurrence; Observation

Contacts

Geographic Coverage

The Adour and Nivelle are two French rivers draining into the Bay of Biscay. The mouth of the Nivelle River is located at Saint-Jean-de-Luz. That of Adour River has changed several times during the last centuries, being now located at Bayonne (river diversion by Louis de Foix in 1578).

Temporal Coverage

Project Data

MIGRADOUR and INRAE are both involved in migratory fish monitoring in southwest France. 1. MIGRADOUR is a non-profit association under French law 1901. The goal of MIGRADOUR is to protect and restore migratory fish populations and their habitats in southwest France (the Adour River and the coastal streams of both the Basque Country and Département des Landes). MIGRADOUR currently focuses on five migratory fish species: Alosa alosa, Anguilla anguilla, Petromyzon marinus, Salmo salar, Salmo trutta. In order to provide managers with appropriate information that will help them to adopt informed management and conservation strategies, MIGRADOUR collects data at various key life stages of fish species: a. adult run (trapping or video recording of upstream migrants) b. catch statistics c. spawning activity (redd counts) d. juvenile density (electrofishing survey). MIGRADOUR is also involved in stocking activities (Salmo salar only). 2. INRAE (Institut national de recherche pour l’agriculture, l’alimentation et l’environnement) is a research institution established in the Nivelle Valley with the research unit UMR INRAE-UPPA ECOBIOP (Behavioural Ecology and Fish Population Biology). The research undertaken by ECOBIOP focuses on the role of individual behaviour in the structure and evolution of wild fish populations. The Nivelle River is equipped with two migratory fish monitoring stations. ECOBIOP's technical team (IE ECP, DOI : 10.15454/1.5572402068944548E12) and MIGRADOUR jointly manage these two trapping facilities (equipment and staff). The Adour and Nivelle rivers have now been monitored for several decades, producing extensive chronological data series.

The personnel involved in the project:

Sampling Methods

Both river-resident and seatrout were possibly caught in the fishtrap but only sea trout were considered in this dataset. Silvered body, presence of St. Andrew's cross on the body, absence of pigmentation on the flanks, adipose fin orange-coloured and other fins transparent were some of the key criteria used to distinguish sea trout (e.g. Bagliniere et al. 2001). The data of the present dataset were obtained at seven trapping devices: for the Nivelle River – Uxondoa and Olha; for the Adour River – Puyoo, Baigts-de-Béarn, Sorde-l’Abbaye, Chopolo and Halsou. Among them, only Olha and Baigts-de-Bearn traps provided census data when operating. Depending on the site, trapping devices operated all or most of the year, and, in the latter case, trapping was planned to overlap with sea trout upstream migration peak. Depending on the distance between the trap and river mouth, the peak of migration occurred in May, June or July. When operating, traps were checked daily except when the river was in spate or when repairs to the dam were undertaken (trap disarmed). In hot conditions (higher than 20° Celsius), data were collected but no scales were taken in order to speed up the fish handling process, reduce fish stress and avoid fish mortality. Similarly, during the migration peak, scales were taken on a subsample only.

Method step description:

1. The fish were chemically anesthetized to be safely handled and visually examined.
2. The side colouration was noted (silver-coloured, light-coloured and dark-coloured). Silver body is the typical colouration of the marine fish whereas coloured sides are an early indicator of freshwater acclimation of the sea trout.
3. The presence/absence of the ectoparasite Lepeophtheirus salmonis was recorded. Attached sea lice are commonly found on salmonids in the sea and survive for at least one week after the host enters fresh water (Hahnenkamp & Fyhn 1985). The presence of the ectoparasite is thus an indicator of a recent sojourn of the host in sea water prior to its capture in the trap.
4. The fish was then placed flat on the measuring device to measure fork length (from the tip of the snout to the end of the middle rays of the tail) to the nearest 1 mm (Nivelle) or to the nearest 5 mm (Adour).
5. Scale samples were taken from fish just posterior to the dorsal fin and before the adipose fin above the lateral line using a knife or forceps. Scales were placed in a small paper envelope especially designed for storing scales. Each envelope was properly identified and slowly dried at room temperature. Whenever possible, four scales were selected for reading, each having a clear focus, exhibiting little erosion apart from spawning marks, and showing obvious annuli in both the river and sea zones. Selected scales were cleaned by soaking them for about 20 minutes in a solution (3% v/v) of sodium hydroxide, washed in distilled water and rubbed with a fine brush to remove any soft tissue or paper fibres. The selected clean scales were then mounted between a microscope slide and coverslip together with a drop of glycerine solution (20% v/v). Capture of images of scales was obtained with a microfiche reader (Canon Microfilm Scanner 300) equipped with magnification lenses EZ03 (30x-50x) and an image analysis software (CapturePerfect version 1.0) allowing a 300-600 dpi digital scanning.

Collection Data

Bibliographic Citations

1. Hahnenkamp L, Fyhn HJ (1985) The osmotic response of salmon louse,Lepeophtheirus salmonis (Copepoda: Caligidae), during the transition from sea water to fresh water. Journal of Comparative Physiology B, 155, 357-365. https://link.springer.com/content/pdf/10.1007%2FBF00687479.pdf
2. Masson S, Lepais O, Manicki A, Prevost E, Chat J (2018) Disentangling individual movement between populations from effective dispersal in the facultative anadromous Salmo trutta L. Ecology of Freshwater Fish, 27, 323-338. https://onlinelibrary.wiley.com/doi/epdf/10.1111/eff.12349
3. Pratten D, Shearer W (1983) Sea trout of the North Esk. Aquaculture Research, 14, 49-65. https://onlinelibrary.wiley.com/doi/epdf/10.1111/j.1365-2109.1983.tb00056.x
4. Chat, Joelle; Gueraud, Francois; Coste, Pascale; Carlut, Esther; Lange, Frédéric; Aymes, Jean-Christophe; Barracou, David, 2019, "Images d'écailles de truites de mer de la Nivelle (FR) / Images of sea trout scales from Nivelle (EN)", https://doi.org/10.15454/SFE2D7, Portail Data Inra, V1 https://doi.org/10.15454/SFE2D7
5. Chat, Joelle; Gueraud, Francois; Coste, Pascale; Aymes, Jean-Christophe; Barracou, David, 2019, "Images d'écailles de truites de mer de l'Adour (FR) / Images of sea trout scales from Adour (EN)", https://doi.org/10.15454/5X8L3X, Portail Data Inra, V1 https://doi.org/10.15454/5X8L3X
6. ECP, INRA, 2018. Ecology and Fish Population Biology Facility, doi: 10.15454/1.5572402068944548E12 doi: 10.15454/1.5572402068944548E12
7. Bagliniere JL, Ombredane D, Marchand F (2001) Morphological criteria for identification of two forms (river, Sea) of brown trout (Salmo trutta) present in the same river. Bulletin Francais De La Peche Et De La Pisciculture, 375-383. https://www.kmae-journal.org/articles/kmae/pdf/2001/01/kmae200035735816.pdf

Additional Metadata