References of "Philippart, Jean-Claude"
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See detailA 12-year study of the upstream migration of Anguilla anguilla in a fish-pass in the river Meuse reveals a dramatic decline of the stock in Belgium.
Philippart, Jean-Claude ULg; Ovidio, Michaël ULg; Sonny, Damien

Conference (2005, April)

From 1992 to 2004 upstream migrating eels were collected in a trap (0,5 cm mesh size) installed at the top of a small pool-type fish-pass at the Visé-Lixhe dam (built in 1980 for navigation purposes and ... [more ▼]

From 1992 to 2004 upstream migrating eels were collected in a trap (0,5 cm mesh size) installed at the top of a small pool-type fish-pass at the Visé-Lixhe dam (built in 1980 for navigation purposes and hydropower generation; height : 8,2 m; not equipped with a ship-lock) on the international River Meuse near the Dutch -Belgium border (290 km from the North Sea; width: 200 m; mean annual discharge: 238 m3/s; summer water temperature 21-26°C).The trap in the fish-pass was checked continuously (three times a week) over the migration period from March to September each year, except in 1994. We caught a total number of 32157 eels (biomass 1,955 kg) with a size from 14 cm to 85 cm and a mean value of 31,6 cm corresponding to yellow eels. The study based on a constant year-to-year sampling effort revealed a regular decrease of the annual catch from a maximun of 5613 fish in 1992 to a minimum of 423 in 2004. This demographic trend is fitted by the equation: number per year = 5.614 - 299 t, where t is time in years with 1992 as year 1. According to this model, the upstream migrating yellow eelstock in the Belgian Meuse should drop to near zero within the next ten years, as an expression of a collapsing recruitment of glass eels in the estuary in the Netherlands. In the discussion of these results, we examine the possible role of two other factors on the decrease over time of the number of yellow eels caught in the fish-pass. i) the effect of environmental variables (river discharge, water temperature and dissolved oxygen content) on the timing and intensity of upstream migration waves and ii) the existence and use of alternative migration routes. [less ▲]

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See detailThe reconstruction of an Atlantic salmon population in the Belgian River Meuse basin. First success and new threats.
Philippart, Jean-Claude ULg; Ovidio, Michaël ULg; Frank, Vincent et al

Conference (2005, April)

A 'Meuse Salmon' project aiming at restoring an Atlantic salmon run in the River Meuse basin was put forward in 1983 (after the discovery of several 'sea trout' in the Meuse near Liège) and started ... [more ▼]

A 'Meuse Salmon' project aiming at restoring an Atlantic salmon run in the River Meuse basin was put forward in 1983 (after the discovery of several 'sea trout' in the Meuse near Liège) and started officially in 1987 as a contribution of Wallonia to the European Year of Environment. In the course of this programme, most dams (3-8 m in height) obstructing the canalised River Meuse in Belgium and The Netherlands have been fitted with modern fish-ways in order to restore the free circulation of diadromous fish species. A second facet of the Salmon Meuse programme consisted in restocking salmonid streams in the Belgian Ardennes with hatchery reared salmon parr and smolt (maximum 200.000 fish per year) from foreign origins (Scotland, Ireland and France). Returning adult salmon have been scientifically recorded in the Meuse in The Netherlands (estuary and lower course) since 1994 but only since the year 2002 in Belgium: 13 (61-79 cm FL) fish in 2002 and 2 (71-76 cm FL) fish in 2003 caught mostly (13 fish) in a new big fish-pass at the Visé-Lixhe dam and (2 fish) in the River Berwinne, a small tributary of the Meuse known as the last spawning place for S. salar in Belgium in the 1920's. Female and male returning salmon in 2002 were successfully artificially reproduced in order to build a captive freshwater brood stock to be used for production of parrs and smolts of the new Meuse strain next autumn. The communication briefly reports on the progress of the program as concerns the salmon culture for stocking in Wallonia, the population dynamics of stocked parrs in nursery rivers, the patterns of upstream and downstream migration of salmon in the Belgian Meuse and its tributaries and the new challenges to meet (impact on salmon of rising water temperature, development of power generation, increasing predation on smolts by piscivorous birds). [less ▲]

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See detailLa pêche traditionnelle dans les pleines inondables du fleuve Ouémé au Bénin
Laleyé, Philippe; Akélé, David; Philippart, Jean-Claude ULg

in Cahiers d'Ethologie (2005), 22(2), 25-38

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See detailArtisanal gill-net fishery catches of the catfish, Schilbe intermedius (Tleostei:Schilbeidae), in two tributaries of the Ouémé River, Benin, West Africa
Laleyé, Philippe; Salako, Osmane; Chikou, Antoine et al

in African Journal of Aquatic Science (2005), 30(2), 163-166

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See detailEffects of a micro hydroelectric power plant upon population abundance, mobility and reproduction behaviour of European grayling T. thymallus and brown trout S. trutta in a salmonid river
Ovidio, Michaël ULg; Paquer, Frédéric ULg; Capra, Hervé et al

in Garcia de Jalon, Diego; Vizcaino Martinez, Pilar (Eds.) International Symposium on Ecohydraulics. Aquatic habitat: Analysis & Restoration (2004)

This study examines the potential effects of a new micro hydroelectric power plant (MHPP) on the behaviour (habitat use, movements) and population abundance of European grayling (T. thymallus) and brown ... [more ▼]

This study examines the potential effects of a new micro hydroelectric power plant (MHPP) on the behaviour (habitat use, movements) and population abundance of European grayling (T. thymallus) and brown trout (S. trutta) in the Lhomme (Belgian Ardennes). Thirteen grayling and five brown trout were captured before their spawning period and were manually radio-tracked up to 6 times a week. Population density and biomass were estimated into two different sampling sectors with electric fishing, before and after the MHPP started up. The mobility patterns of grayling and trout in the reach of the river Lhomme influenced by the MHPP strongly contrasted with results obtained in an undisturbed river of the same type in the Belgian Ardennes. Movements were mostly restricted and rarely increased during the spawning period. Spawning took place, but was disturbed by hydropeakings. The population biomass of grayling and trout decreased by 61 % and 23 % respectively, five months after the start-up of the MHPP exploitation. [less ▲]

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See detailSpawning movements of European grayling Thymallus thymallus in the River Aisne (Belgium)
Ovidio, Michaël ULg; Parkinson, Denis; Sonny, Damien et al

in Folia Zoologica (2004), 53(1), 87-98

In three consecutive years (1998 to 2000), 20 adult grayling Thymallus thymallus (L.) (FL +/- SD: 326 +/- 43 mm) were radio-tracked during circum reproduction period (February to May) in the River Aisne ... [more ▼]

In three consecutive years (1998 to 2000), 20 adult grayling Thymallus thymallus (L.) (FL +/- SD: 326 +/- 43 mm) were radio-tracked during circum reproduction period (February to May) in the River Aisne, Belgium. Before the spawning period, grayling remained consistently in the pool-riffle sequence in which they had been captured. Pre-spawning migration time extended from 7 to 29 March. Distances travelled during the spawning migration ranged from 70 to 4980 in (mean +/- S.E.: 1234 +/- 328 m). Spawning migrations stalled under conditions of decreasing water level and increasing water temperature in a thermal range (daily mean Tdegrees) from 5 to 8 degreesC. Spawners remained from 1 to 31 days (mean +/- S.D.: 10.4 +/- 9.8 days) at the spawning grounds and performed a post-spawning homing from 28 March to 18 April in decreasing water flow and in a thermal range (daily mean Tdegrees) from 7 to 11 degreesC. This study demonstrates that migration patterns of grayling are similar between years, but with a timing adjusted as a response to annual variations of the hydroclimatic conditions. [less ▲]

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See detailETUDE DE LA REPARTITION SPATIALE ET DE LA DENSITE DE POPULATION DU HERON CENDRE DANS LA BASSE OURTHE AU PRINTEMPS 2004 COMME BASE A L'ESTIMATION DE LA PRESSION DE PREDATION EXERCEE SUR LE PEUPLEMENT DE POISSONS.
Philippart, Jean-Claude ULg; Poncin, Pascal ULg; Delcourt, Johann ULg

Report (2004)

En complément de l'étude approfondie du comportement de prédation du héron cendré sur le site hyper-attractif de la Meuse en aval du barrage de Lixhe, nous avons porté notre attention sur un tronçon de la ... [more ▼]

En complément de l'étude approfondie du comportement de prédation du héron cendré sur le site hyper-attractif de la Meuse en aval du barrage de Lixhe, nous avons porté notre attention sur un tronçon de la basse Ourthe entre Liège et Esneux où viennent s'alimenter au printemps des hérons probablement attachés à l'importante Colonie de Colonster. Dans ce milieu, l'objectif était de recenser les hérons selon une méthodologie standardisée : i) à différentes dates pendant la période de reproduction de l'espèce à Colonster qui s'étale de mars à mai et ii) en tenant compte de l'hétérogénéité du milieu au point de vue du degré d'antropisation et des possibilités d'expression par les hérons du répertoire des comportements de pêche typiques et atypiques mis en évidence dans la Meuse à Lixhe. [less ▲]

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See detailLE COMPORTEMENT DE PREDATION DU HERON CENDRE DANS LA MEUSE EN AVAL DU BARRAGE DE LIXHE EN MARS -MAI 2004
Philippart, Jean-Claude ULg; Poncin, Pascal ULg; Delcourt, Johann ULg

Report (2004)

Au printemps, la Meuse en aval du barrage de Visé-Lixhe (fig. 1) est un important lieu d'alimentation des hérons cendrés vraisemblablement attachés à la héronnière de Lanaye (une cinquantaine de couples ... [more ▼]

Au printemps, la Meuse en aval du barrage de Visé-Lixhe (fig. 1) est un important lieu d'alimentation des hérons cendrés vraisemblablement attachés à la héronnière de Lanaye (une cinquantaine de couples reproducteurs en 2004; voir Annexe 1) située en aval et à celle de Vivegnis située en amont (Jacobs et al., 2003). Par ailleurs, le site de Lixhe offre des conditions d'observation exceptionnelles pour réaliser une étude détaillée du comportement de prédation de l'espèce. C'est ce type d'étude qui a été entreprise au printemps 2004 avec un double objectif: d'une part, améliorer les connaissances sur la biologie du héron cendré dans nos régions, notamment en terme d'écologie comportementale (répertoire des comportements alimentaires, relations prédateurs-proies, incidence sur le peuplement en poissons) et, d'autre part, tester une méthodologie d'étude transposable à des sites comparables et spécialement à des piscicultures. [less ▲]

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See detailLong range seasonal movements of northern pike (Esox lucius L.) in the barbel zone of the River Ourthe (River Meuse basin, Belgium).
Ovidio, Michaël ULg; Philippart, Jean-Claude ULg

Conference (2003, June)

In order to study the annual activity cycle and reproductive ecology of northern pike (Esox lucius L.) in the River Ourthe (Belgian Ardenne), 6 fish (579-742mm FL, 1605-4090g, 2 females and 4 males) were ... [more ▼]

In order to study the annual activity cycle and reproductive ecology of northern pike (Esox lucius L.) in the River Ourthe (Belgian Ardenne), 6 fish (579-742mm FL, 1605-4090g, 2 females and 4 males) were captured by electric fishing in November 2000 and January 2001. They were surgically implanted with a radio-transmitter and tracked for 149 to 349 days in a 30-km river stretch. During the pre-spawning period in winter, most movements were between distinct holding areas spaced from 40 to 550 m. All the pike began the upstream spawning migration between 8 February and 30 March 2001, when the mean water temperature varied from 6.7°C to 8.7 °C and the water flow from 52 to 199 m3s-1. The six pike travelled upstream, over distances ranging from 0.75 km to 15.7 km to reach their potential spawning sites. Pike arrived on their potential spawning sites between the 13 February and the 02 April 2001 and remained there from 5 to 25 days when the daily mean water temperature ranged from 2.9 to 10.0 °C. The six pike moved downstream after spawning and showed similar behaviour to those observed prior to spawning, but the distances between holding areas were more extended than during the winter pre-spawning period. When considering the entire tracking period, the longitudinal extension of the activity domains ranged 1 421 to 24 798 m (mean 12,050 m). This exploratory study provided original observations on northern pike movements in a barbel zone of the River Meuse basin. Results contrasted with the widely established view of pike being a sedentary predator and provides data on its behaviour throughout the annual cycle. [less ▲]

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See detailCaractérisation et utilisation du micro-habitat du saumon atlantique (Salmo salar) selon la stucture turbulente del'écoulement.
Brown, Julie; Boyer, Claudine; Enders, Eva et al

Conference (2003, May)

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See detailEtude des impacts hydrauliques, sédimentologiques et écologiques liés aux travaux hydrauliques sur la Semois
Gob, Frédéric ULg; Houbrechts, Geoffrey ULg; Mols, Julien et al

in Schmitz, Serge (Ed.) Les Journées des Géographes Belges: Evaluer la capacité du milieu (2003)

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See detailEtudes des impacts hydrauliques, sédimentologiques et écologiques liés aux travaux hydrauliques sur la Semois
Gob, Frédéric; Houbrechts, Geoffrey ULg; Mols, Julien et al

in Belgeo (2003), 3

Cette étude tente d’évaluer les impacts des dragages réalisés dans le bassin de la Semois (Ardenne). Cette étude interdisciplinaire se penche sur les aspects hydrauliques, environnementaux ... [more ▼]

Cette étude tente d’évaluer les impacts des dragages réalisés dans le bassin de la Semois (Ardenne). Cette étude interdisciplinaire se penche sur les aspects hydrauliques, environnementaux, géomorphologiques et sédimentologiques. [less ▲]

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