Article (Scientific journals)
Migration behaviour of Atlantic salmon smolts (Salmo salar L.) in a short and highly fragmented gravel-bed river stretch
Renardy, Séverine; Colson, Dylan; Benitez, Jean-Philippe et al.
2022In Ecology of Freshwater Fish, 31 (3), p. 499-514
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Keywords :
Archimedes screw; behavioural tactic; hydraulics; hydroelectricity; migration barrier; mortality
Abstract :
[en] The succession of migration barriers and different turbine types during downstream migration impede Atlantic salmon (Salmo salar L.) smolts from reaching the sea in time but is poorly studied. We investigated the isolated and cumulative impacts of 14 consecutive migration barriers (MBs) on downstream migration of 200 radio-tagged smolts over an 18.9 km stretch of gravel-bed river, by equipping five MBs with automated radio listening stations. At the level of isolated barriers, median research times (i.e. time between the first and the last detection upstream of a MB) varied between 0.1 and 0.7 h. The median crossing delays (i.e. time between the first detection upstream and the first detection downstream of a MB) varied between 1 and 2.9 h. Considering successive MBs, median cumulative crossing delays varied between 2.6 and 32.1 h and increased with the number of MBs. We observed a global mortality rate between 33% and 76%, increasing with the distance travelled and the associated number of MBs. Only 48% of the migrating smolts reached the end of the studied river stretch. Results suggest that the dynamics of the smolt downstream migration over this short highly fragmented stretch had a significant effect in terms of delays, mortalities and seaward escapement rate.
Research center :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Renardy, Séverine  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Gestion des ressources aquatiques et aquaculture - UR FOCUS
Colson, Dylan;  Profish Technology S.A.
Benitez, Jean-Philippe  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Gestion des ressources aquatiques et aquaculture - UR FOCUS
Dierckx, Arnaud ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Département de Biologie, Ecologie et Evolution
Goffaux, Delphine;  Profish Technology S.A.
Sabbe, Justine ;  Profish Technology S.A.
Rabouan, Amaury;  Profish Technology S.A.
Detrait, Olivier;  Service Public de Wallonie (SPW) > DDRCB-DCENN
Nzau Matondo, Billy  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Gestion des ressources aquatiques et aquaculture - UR FOCUS
Sonny, Damien;  Profish Technology S.A.
Ovidio, Michaël  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Gestion des ressources aquatiques et aquaculture - UR FOCUS
Language :
English
Title :
Migration behaviour of Atlantic salmon smolts (Salmo salar L.) in a short and highly fragmented gravel-bed river stretch
Publication date :
09 July 2022
Journal title :
Ecology of Freshwater Fish
ISSN :
0906-6691
eISSN :
1600-0633
Publisher :
Blackwell, Oxford, United Kingdom
Volume :
31
Issue :
3
Pages :
499-514
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
SPW Agriculture, Ressources naturelles et Environnement - Service Public de Wallonie. Agriculture, Ressources naturelles et Environnement [BE]
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