Since 1984, monitoring has been carried out to observe migration phenology and quantify the abundance of migratory adults trout and sea trout in Nivelle basin. A trapping system controls adults salmon migration by means of 2 traps, one in the downstream part and an other upstream to estimate the effectiveness. On this occasion, biometric characteristics are developed to characterize the population in order to feed this data set.
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How to cite
Researchers should cite this work as follows:
Lange F, Dumas J, Rives J, Aymes J, Prévost E (2023): Phenology and biological traits of migrating brown trouts and sea trouts sampled by trapping in the Nivelle river (France).. v1.2. Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE). Dataset/Occurrence. https://ipt.gbif.fr/resource?r=inrae_nivelle_pieges_trf_trm&v=1.2
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.
This resource has been registered with GBIF, and assigned the following GBIF UUID: e0294122-6838-4e18-8fdc-756ac24ec6b4. 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.
Occurrence; population composition; trapping; sea trout; brown trout; smot; migration; phenology
- Metadata Provider ●
- Point Of Contact
The Nivelle river in Basque Country (France). http://services.sandre.eaufrance.fr/Courdo/Fiche/client/fiche_courdo.php?CdSandre=S52-0400
|Bounding Coordinates||South West [43.24, -1.67], North East [43.39, -1.48]|
No Description available
|Species||Salmo trutta (Linnaeus, 1758) (sea trout), Salmo trutta (Linnaeus, 1758) (brown trout)|
|Start Date / End Date||0014-04-06 / 0028-06-13|
The Uxondoa and Olha traps are in continuous operation from March to January, except during periods of high flooding. The traps are checked at least once a day.
|Study Extent||Nivelle river, CdSandre=S52-0400 Latitude between 43.2426 and 43.3912; longitude between -1.4799 and -1.6694 Source latitude and longitude : 43.2173 -1.5231 Last confluence point latitude and longitude : 43.3854 -1.6639 The Nivelle is a 39 km long coastal stream of Pays Basque. It has its source in Spain and flows into the Bay of Biscay at Saint-Jean-de-Luz. Its drainage basin has a surface area of 238 km2, and is dominated by marly-calcareous formations. It is essentially agro-pastoral with more than 50% of the land area made of moors (Dumas, 2003). The oceanic climate, mild and wet (1700 mm year-1 in St-Pe´e-sur-Nivelle), provides a mean annual discharge of 5.4m3 s-1 downstream from the confluence of the main tributary, the Lurgorrieta, and 7 m3 s-1 at the mouth. The water, neutral to slightly alkaline, is of good quality upstream from Saint-Pée-sur-Nivelle, but deteriorates downstream.|
Method step description:
- Adult brown trout and sea trout have been monitored since 1984 by trapping at Uxondoa trap in the Lower Nivelle operating the whole year. Trap configuration allows only partial capture depending on the flow. A second upstream trap at olha in the upper Nivelle (since 1992) allows to estimate the effectiveness.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), sexed 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.
|Collection Name||Colisa - Collection of Ichtyological Samples|