Seventy years after extinction, Atlantic Salmon (Salmo salar) comes back to the river Meuse in Belgium as a result of the Meuse Salmon 2000 restoration project.
Philippart, Jean-Claude ; Ovidio, Michaël ; Rimbaud, Gilles
Conference (2000, November)Detailed reference viewed: 14 (1 ULg)
A radio-tracking study on the impact of small dams on the conservation of salmonid fish in Southern Belgium.
Ovidio, Michaël ; ; et al
Conference (2000, November)Detailed reference viewed: 20 (4 ULg)
Relationship between habitat structure and the mobility of brown trout in a small stream.
Ovidio, Michaël ; ; Philippart, Jean-Claude et al
Conference (2000, September)Detailed reference viewed: 13 (2 ULg)
Methodological bias in home range and mobility estimates when locating radio-tagged trout, Salmo trutta, at different time intervals
Ovidio, Michaël ; Philippart, Jean-Claude ;
in Aquatic Living Resources (2000), 13(6), 449-454
Radio tracking has been extensively used to enhance our knowledge on the movement and home range of fish in general and salmonids in particular. However, the use of various temporal sampling protocols is ... [more ▼]
Radio tracking has been extensively used to enhance our knowledge on the movement and home range of fish in general and salmonids in particular. However, the use of various temporal sampling protocols is likely to overlook fish movements, and produce experimental artefacts, the amplitude of which is unknown and may compromise comparison of fish behaviours revealed by different protocols. Starting from a day-by-day tracking study of brown treat in Belgian waters (Aisne stream, nine fish, minimum 39 daily locations per fish), we re-examined their home range and mobility, through a subsampling process, as if the fish had been located at longer time intervals (2-14 days). The estimates from subsamples were compared to the original data set in order to quantify the corresponding reduction of accuracy from observed data, and how far this could be predicted on the basis of locating frequency. The results clearly indicate that all intervals longer than one day generally generate substantial biases (reduction of accuracy from 0 to 82% for home range and from 5 to 92% for mobility) but these can be partly corrected through the use of predictive models. This analysis demonstrates that any comparison between studies relying on different locating frequencies can generate some ambiguity when interpreting biological phenomena or geographical differences. (C) 2000 Ifremer/CNRS/INRA/IRD/Cemagref/Editions scientifrques et medicales Elsevier SAS. [less ▲]Detailed reference viewed: 52 (4 ULg)
Relationship between the drift of macroinvertebrates and the activity of brown trout in a small stream
; Ovidio, Michaël ; Philippart, Jean-Claude et al
in Journal of Fish Biology (2000), 56(5), 1248-1257
Brown trout Saline trutta were most active in a small stream at night. dusk and dawn when drift rate was highest, but correlations between hourly drift rates and the trout's activity varied substantially ... [more ▼]
Brown trout Saline trutta were most active in a small stream at night. dusk and dawn when drift rate was highest, but correlations between hourly drift rates and the trout's activity varied substantially between individuals, between different dates for a single individual, and between different periods of the daily cycle. On some occasions. the trout were responsive to the total drift rate, either at night or during the day, and on others to the largest drifting organisms only (terrestrial organisms, adults of Ephemeroptera, Diptera and Trichoptera). The study supports the idea that trout adapt their activity pattern to the abundance of drifting prey, either as generalists towards any organism, or as specialists towards the largest ones. (C) 2000 The Fisheries Society of the British Isles. [less ▲]Detailed reference viewed: 61 (21 ULg)
Le comportement migrateur des poissons en Wallonie. Caractérisation biologique et implication pour une gestion durable des populations.
Philippart, Jean-Claude ; Ovidio, Michaël
Conference (1999, November)Detailed reference viewed: 12 (3 ULg)
Tactiques et stratégies individuelles d’utilisation spatio-‐temporelle de l’habitat et des ressources alimentaires chez la truite commune (Salmo trutta L.): étude par radio-‐pistage dans l’Aisne et l’Ourthe.
Doctoral thesis (1999)Detailed reference viewed: 24 (7 ULg)
Annual activity cycle of adult brown trout (Salmo trutta L.): A radio-telemetry study in a small stream of the Belgian Ardenne
in Bulletin Français de la Pêche et de la Pisciculture (1999), (352), 1-18
During a study period of 26 months, twenty trout (26.0-57.0 cm FL; 198-1,685 g) were daily located from 16 to 466 days in a small stream of the Belgian Ardenne, the Aisne stream (tributary of the river ... [more ▼]
During a study period of 26 months, twenty trout (26.0-57.0 cm FL; 198-1,685 g) were daily located from 16 to 466 days in a small stream of the Belgian Ardenne, the Aisne stream (tributary of the river Ourthe) in order to characterize their annual pattern of mobility. Daily movements were more frequent and longer during the spawning period (October-December) than at any other time of the year. Upstream migrations (max.: 25 km) generally occurred during October and the first fortnight of November and were triggered by a combination of Variations of water temperature and water level within a thermal range of 10-14 degrees C. Spawning activity (second fortnight of November until late December) took place in the Aisne stream (max. width : 10 m) or in its small tributaries. Trout surviving spawning undertook a fast (max.:9,200 m in 24 h) and precise post reproductive homing. From winter to summer, daily movements were shorter and mainly corresponded to changes of residences within a home range of which the size was proportional to the trout's size. In March and June, some trout made long upstream unidirectional migrations of which the biological signification is still unknown. These results are discussed within the context of life history strategies and management of trout populations. [less ▲]Detailed reference viewed: 129 (22 ULg)
Les migrations de remontée des poissons dans la Meuse liégeoise et l’Ourthe. Bilan des connaissances et perspectives.
Philippart, Jean-Claude ; Rimbaud, Gilles ; et al
Conference (1998, October 21)Detailed reference viewed: 12 (1 ULg)
Etude par radio-pistage des stratégies d’utilisation de l’espace par la truite commune (Salmo trutta L.) dans un petit cours d’eau des Ardennes belges.
Ovidio, Michaël ; ; et al
Conference (1998, June)Detailed reference viewed: 19 (6 ULg)
Seasonal variations of foraging tactics in resident brown trout Salmo trutta.
Ovidio, Michaël ; ; et al
Conference (1998, June)Detailed reference viewed: 9 (3 ULg)
Environmental unpredictability rules the autumn migration of brown trout (Salmo trutta L.) in the Belgian Ardennes
Ovidio, Michaël ; ; et al
in Hydrobiologia (1998), 372
This telemetry study aimed to document the mobility of Salmo trutta in the River Ourthe sub-basin (tributary of the River Meuse) during summer and autumn, and to analyse the environmental factors which ... [more ▼]
This telemetry study aimed to document the mobility of Salmo trutta in the River Ourthe sub-basin (tributary of the River Meuse) during summer and autumn, and to analyse the environmental factors which trigger spawning migration or limit their extension. Nine trout (233-2217 g and 26.6-55.2 cm FL) were radio-tagged with intraperitoneal radio transmitters and positioned daily, from 14 August 1996 to 15 January 1997. Until 1 October, fish showed restricted movements: daily journeys never exceeded 300 m and corresponded to displacements by high floods or to routine home range movements. From 7 October to 15 November, seven of the nine trout travelled upstream over distances from 5.6 to 22.95 km, into tributaries and sub-tributaries. Migration speed was fast during the early days, when trout could travel over more than 5 km per night, then progressively decreased as they were approaching putative spawning redds under lower temperature. Both ire the River Ourthe and in the Aisne stream, all migrations started within less than three weeks (early October) and were found to be triggered by the combination of three environmental factors: high variations of water temperature and water level between consecutive days, within a thermal range of 10-12 degrees C. From the trout point's of view, these may be signs that the environment becomes unpredictable, as its variability increases within a thermal range which no longer enables them to achieve high growth rates. These results are discussed within the context of foraging strategies, life history strategies and management of trout population. [less ▲]Detailed reference viewed: 53 (14 ULg)
Effect of sub sampling data sets of daily radio locations on the identification of mobility patterns of freshwater fish: trade off between accuracy and cost effective tracking strategies
; Ovidio, Michaël ;
Conference (1997, April)Detailed reference viewed: 16 (7 ULg)
Behaviour and mobility of radio-tagged Barbus barbus below an hydroelectric dam on the River Ourthe (Belgium).
; ; Ovidio, Michaël et al
Conference (1997, April)Detailed reference viewed: 31 (4 ULg)
Environmental unpredictability rules the autumn migrations of trout (Salmo trutta) in the Belgian Ardennes.
Ovidio, Michaël ; ; et al
Conference (1997)Detailed reference viewed: 9 (1 ULg)
Behavioural strategy of trout (Salmo trutta) in man-modified river ecosystems: identification of the fast growing "dam trout" ecotype
Ovidio, Michaël ;
Conference (1997)Detailed reference viewed: 16 (6 ULg)
Observations sur l'efficacité de la nouvelle passe à poissons sur l'Aisne à Bomal
Philippart, Jean-Claude ; ; et al
Article for general public (1996)Detailed reference viewed: 7 (0 ULg)
A critical review of surgery techniques for implanting telemetry devices into the body cavity of fish
; ; et al
Conference (1996, August)
Based on literature survey and personal experience, this paper presents a critical review of surgery procedures to implant telemetry devices (transmitters, transponders) into the body cavity of fish ... [more ▼]
Based on literature survey and personal experience, this paper presents a critical review of surgery procedures to implant telemetry devices (transmitters, transponders) into the body cavity of fish species. It debates on the relative adequacy of techniques which may compromise or enhance tagging success with respect to fish health and transmitter retention: anaesthesia, incision (position and length of incision), transmitter features (size and weight ratios, coating), ways of closing the incision (stitches, staples, adhesives), prophylaxy, pre- and postoperative care. Behavioural and physiological biases originating from tagging or internal presence of the transmitter are reviewed, evaluated and integrated to determine the actual duration of the post-operative perturbation and subsequent validation of telemetry data. [less ▲]Detailed reference viewed: 99 (10 ULg)
Daily and seasonal movements of radio-tagged trout (Salmo trutta) in the Belgian Ardennes: mobility versus residency
Conference (1996, August)
This study describes the mobility patterns of two trout (Salmo trutta L.) of different morphotypes (one typical brown trout and one intermediate between the sea and brown trout) telemetred during 172 ... [more ▼]
This study describes the mobility patterns of two trout (Salmo trutta L.) of different morphotypes (one typical brown trout and one intermediate between the sea and brown trout) telemetred during 172 consecutive days in the River Meuse Basin (Belgian Ardennes). The two trout behaved quite differently. The typical brown trout showed little mobility (home range < 1.1 km and longest net daily journey of 850 m) and a constant fidelity to a main area. The other trout was highly mobile (home range extending over 46 km, with net daily journeys as long as 14 km) with no apparent attachment to any particular residence. These results further question the colloquial belief that all freshwater trout are resident fish and support the idea that different ecotypes (i.e. stream and large river trout) would coexist in the same hydroecosystem. Due to small sample size, it is not permitted to affirm that these ecotypes would be associated to different morphotypes. [less ▲]Detailed reference viewed: 18 (4 ULg)
A preliminary telemetry investigation on the obstacles to anadromous Salmonids migration in spawning streams of the Belgian Ardennes (river Meuse bassin)
Ovidio, Michaël ; ; et al
in Leclerc, Michel (Ed.) Proceedings of the Second IAHR Symposium on Habitat Hydraulics, Ecohydraulique 2000 (1996)
In the course of the 'Meuse Salmon 2000' programme aiming at the restoration of the Atlantic salmon Salmo salar and sea trout Salmo trutta in the River Meuse Basin, most large dams are progressively ... [more ▼]
In the course of the 'Meuse Salmon 2000' programme aiming at the restoration of the Atlantic salmon Salmo salar and sea trout Salmo trutta in the River Meuse Basin, most large dams are progressively equipped with fishways to restore the free circulation of spawners between the North Sea and the first major spawning streams, the River Ourthe and its tributaries. Spawners entering the River Ourthe would still be confronted to so-called minor obstacles, aiming at water regulation for tourism purposes but of which the actual impact on fish migration has never been investigated. In order to test for the actual free-circulation of salmonid spawners in the upper River Ourthe and to locate potential spawning grounds, a probe fish (489 mm FL male sea trout) was tagged with an intraperitoneally implanted radio-transmitter. From the 18th of ovember 1995 onwards, the trout was tracked in a part of the river (44 km upstream of the confluence) which was thought to be devoid of any major obstacle to fish migration. Three days after its release, the trout had migrated over 6 km up to a small weir (1.8 m high). During four consecutive days, the trout was consistently located downstream of the weir but no successful climbing was observed, reflecting the poor efficiency of the central fishpass under dry weather conditions during summer and autumn. The trout then settled in a deep run habitat, 150 m downstream of the weir and no upstream excursion was recorded until the first major rise of water level, four weeks later, even when the weir was opened for water regulation purposes. When the water level was maximum (24th of December), the trout moved upstream of the weir and migrated over 28 km during the next 72 hours up to a spot identified as a potential spawning redd from habitat features, and where it was consistently located till the 31st of December. These results, though most preliminary, clearly indicate that even minor obstacles may cause a substantial lag in trout migration of which the impact on spawning success remains to be determined. Since similar minor man-made obstacles are most frequent in the salmonid spawning streams of the Belgian Ardennes, it is thus uncertain that migratory trout having successfully climbed the major obstacles since the North Sea would find their way to the spawning redds. As a corollary, it is suggested that more detailed case studies should be undertaken, ideally via the use of telemetered probe-fish, in order to provide management policies that would represent a suitable compromise between users of water resources with apparently conflicting interests (water regulation, tourism, nature conservancy). [less ▲]Detailed reference viewed: 43 (7 ULg)