Article (Scientific journals)
Decreased stock entering the Belgian Meuse is associated with the loss of colonisation behaviour in yellow-phase European eels
Nzau Matondo, Billy; Ovidio, Michaël
2018In Aquatic Living Resources, 31 (7)
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Keywords :
Upstream movement; behaviour; body size; speed; yellow-phase eels; freshwater
Abstract :
[en] The upstream migratory behaviour of yellow-phase European eels was investigated in regulated inland rivers (>320 km upstream the sea), where the stock is in drastic decline. From 2010 to 2015, eels entering the Belgian Meuse River (n = 1357; total length, 231–755mm) were caught in fish passes, tagged with a pit-tag and released. Their upstream movements were tracked during the next six consecutive years, using three detection stations installed in vertical-slot fish passes of the Meuse and its Ourthe tributary. Among the 1357 eels tagged, 27.6% (n = 374 individuals) were detected at one or more of the three upstream detection stations. Only 6.6% (n = 89) of tagged eels were detected at the two subsequent stations. In this last group, most of the detected eels continued to move upstream through the Meuse rather than leaving it for the Ourthe.Water temperature >13 °C, river flow 24–226m3/s, dark time 00:00–05:00 h and the spring–summer seasons were the most important cues for upstream migration. Temperatures and flows at detection did not differ between size classes of ascending eels, while the detection period was earlier and daily speed was faster in large (>450 mm) eels. However, small ( 300mm) eels moved further upstream at slow speeds because they alternated between short periods of movement and long stationary periods. This behaviour suggests the existence of a few nomad individuals and probably more home range dwellers in the entering population. Small eels were better suited to colonise upper rivers.
Research center :
AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Zoology
Author, co-author :
Nzau Matondo, Billy  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire de Démographie des poissons et hydroécologie
Ovidio, Michaël  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire de Démographie des poissons et hydroécologie
Language :
English
Title :
Decreased stock entering the Belgian Meuse is associated with the loss of colonisation behaviour in yellow-phase European eels
Publication date :
22 January 2018
Journal title :
Aquatic Living Resources
ISSN :
0990-7440
eISSN :
1765-2952
Publisher :
EDP Sciences, Les Ulis, France
Volume :
31
Issue :
7
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
European Fisheries Fund (FEP No. 32-1102-002)
Available on ORBi :
since 22 January 2018

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