References of "Ovidio, Michaël"
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See detailHybridization success of three common European cyprinid species, Rutilus rutilus, Blicca bjoerkna and Abramis brama and larval resistance to stress tests
Nzau Matondo, Billy; Ovidio, Michaël ULg; Poncin, Pascal ULg et al

in Fisheries Science (2007), 73(5), 1137-1146

Hybridization success at early developmental stages and larval resistance to osmotic, thermal and fasting tests in roach Rutilus rutilus, silver bream Blicca bjoerkna, common bream Abramis brama and their ... [more ▼]

Hybridization success at early developmental stages and larval resistance to osmotic, thermal and fasting tests in roach Rutilus rutilus, silver bream Blicca bjoerkna, common bream Abramis brama and their F1 hybrids were investigated. Results revealed that hybrid survival rates were similar to parents. At the eyed embryo stage, however, a maternal effect was observed as a general trend during hatchling and larval stages. After these stages, hybrids displayed a higher survival rate than their parents. Under stress tests, no survival was observed after 40 min for osmotic and thermal shocks and after 24 days for the prolonged fasting test in these species and their F1 hybrids. The median survivals of hybrids were intermediate between the two parents. For total mortality, hybrids were also affected by a maternal effect but to the advantage of the hybrids. [less ▲]

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See detailMultiyear homing and fidelity to residence areas by individual barbel (Barbus barbus)
Ovidio, Michaël ULg; Parkinson, Denis; Philippart, Jean-Claude ULg et al

in Belgian Journal of Zoology (2007), 137(2), 183-190

Nine barbels (Barbus barbus) from the River Ourthe (River Meuse basin) were equipped with transmitters programmed to switch ON during two consecutive spawning seasons in 1998 and 1999 (April to July). Six ... [more ▼]

Nine barbels (Barbus barbus) from the River Ourthe (River Meuse basin) were equipped with transmitters programmed to switch ON during two consecutive spawning seasons in 1998 and 1999 (April to July). Six of the nine barbels tracked in 1998 were also tracked in 1999 during the same period. The length of the spawning migration ranged from 200 to 22700m. After the spawning activity observed from 12-16 May 1998 and 4-6 May 1999, the barbels homed to the site occupied before spawning. Each barbel used the same spawning area in 1998 and 1999, despite the presence of other spawning sites on their migratory route. These observations revealed the existence of strict reproductive homing in the barbel and a long-term fidelity to particular resting places. [less ▲]

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See detailDoes turbulence affect the habitat choice of Atlantic salmon parr?
Enders, Eva C; Ovidio, Michaël ULg; Roy, Mathieu L et al

Conference (2007, June)

Habitat preferences of Atlantic salmon parr are commonly described using mean flow velocity, water depth, and substrate as habitat variables, and a variety of habitat models have been developed using ... [more ▼]

Habitat preferences of Atlantic salmon parr are commonly described using mean flow velocity, water depth, and substrate as habitat variables, and a variety of habitat models have been developed using these variables to predict habitat quality. However, Atlantic salmon parr live in highly turbulent streams and rivers, in which intense fluctuations of flow velocity occur. Habitat preferences that consider the high variability of flow velocity have not been studied, and this although it has been shown in laboratory experiments that turbulence may affect the behavior and energetics of fish. Consequently, we studied the use of turbulent flow by Atlantic salmon parr in Patapédia River, Québec, Canada using radio-telemetry. We analyzed summer habitat preferences of individual parr in relation to several dynamic hydraulic variables such as standard deviation of flow velocity, turbulent kinetic energy, Froude number, and shear stress, and compared them with the habitat availability within the river reach. Our results revealed that in a natural flow environment, parr display a high individual variability in habitat preferences in relation to flow turbulence. Such heterogeneous habitat preferences suggest that individuals are not constrained to single habitat types and exhibit flexible habitat use. Furthermore, no differences were observed in habitat preferences between the four daily periods (dawn, day, dusk, and night) within individual parr. [less ▲]

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See detailBehavioural tactics and spawning activity of rheophilic cyprinids radio-tracked in the transition zone between natural flow and minimum flow conditions
Ovidio, Michaël ULg; Guillaume, Nicolas; Hallot, Eric ULg et al

Conference (2007, June)

Using water resources for hydro-electricity production influences and limits the quality and quantity of habitat available for use by resident fishes. Changes in the fish community structure after setting ... [more ▼]

Using water resources for hydro-electricity production influences and limits the quality and quantity of habitat available for use by resident fishes. Changes in the fish community structure after setting minimum flow conditions have been more frequently studied than the behavioural adaptations of fish living in the vicinity of the disturbed river section. In the River Amblève (River Meuse basin, Belgium), a hydraulic power plant bypasses the river over a length of 10 km. Adult nase Chondrostoma nasus (n=10) and barbel Barbus barbus (n=8) were captured in the restitution zone of the turbinated flow several weeks before their reproduction periods. They were equipped with implant radio transmitters and manually and intensively tracked over several months to more than 1 year. The environmental conditions (water temperature and flow) as well as the geomorphology of the river were compared in both natural and flow-regulated sections. Nase and barbel demonstrated the capacity to map their contrasted environment and adapted their space and habitat utilisation as well as the choice of their spawning sites in relation with their specific biological characteristics and the environmental variations. The results are discussed in the context of the management of fish movements in flow-regulated rivers. [less ▲]

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See detailMobility of individual roach Rutilus rutilus (L.) in three weir-fragmented Belgian rivers
Geeraerts, Caroline; Ovidio, Michaël ULg; Verbiest, Hilde et al

in Hydrobiologia (2007), 582

Adult roach Rutilus rutilus (L.) (N = 24; 19.9-36.1 cm FL) from three highly fragmented Belgian rivers were tagged with surgically implanted radio transmitters. Their seasonal movements were observed from ... [more ▼]

Adult roach Rutilus rutilus (L.) (N = 24; 19.9-36.1 cm FL) from three highly fragmented Belgian rivers were tagged with surgically implanted radio transmitters. Their seasonal movements were observed from March to August 2004 (circum reproduction period) in river stretches delimited by two physical barriers. In the three rivers, roach displayed similar patterns of movements which were mainly influenced by the date of observation (movements increased in late April-May) and water temperature (travel distances were more important when water temperature ranged between 10 degrees C and 14 degrees C). Roach sometimes cleared physical obstacles. The mean distances travelled in each river were relatively short (max. 2.5 km) and mainly influenced by the length of the study reach, which was delimited by physical barriers. [less ▲]

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See detailDéfinition de bases biologiques et éco-hydrauliques pour la libre circulation des poissons dans les cours d'eau non navigables de Wallonie. Volume 3: Identification des priorités d'action d'après les critères biologiques et piscicoles.
Ovidio, Michaël ULg; Philippart, Jean-Claude ULg

Report (2007)

Depuis 1988, le Ministère de la Région wallonne (MRW), Direction Générale des Ressources Naturelles et de l'Environnement (DGRNE), Direction des Cours d'Eau non navigables (DCENN) fait procéder à un ... [more ▼]

Depuis 1988, le Ministère de la Région wallonne (MRW), Direction Générale des Ressources Naturelles et de l'Environnement (DGRNE), Direction des Cours d'Eau non navigables (DCENN) fait procéder à un inventaire complet des obstacles physiques potentiels à la libre circulation des poissons dans les cours d'eau des bassins hydrographiques de la Meuse, du Rhin et partiellement de l'Escaut. Cette mission est assurée par une équipe de la Fédération des Sociétés de Pêche de l'Est et du Sud de la Belgique (FSPESB) qui a déjà couvert un vaste domaine hydrogéographique . Complémentairement à cet inventaire sur le terrain, la DCENN a chargé le LDPH-ULg de réaliser des études visant à caractériser, notamment par biotélémétrie, la franchissabilité effective de divers types d'obstacles, d'évaluer l'efficacité de certaines échelles à poissons construites sur des cours d'eau non navigables et, de manière générale, de rassembler un maximum d'informations sur l'évolution des connaissances et des techniques en matière de rétablissement de la libre circulation des poissons en rivière (Ovidio et al., 2005 & 2007). Ces différentes approches centrées sur les cours d'eau non navigables sont aussi développées par le LDPH sur les cours d'eau navigables à travers le suivi scientifique du programme Saumon Meuse (MRW, 2007) et l'exécution du volet ULg du programme Fédéral 2003-2006 FISHGUARD (Blust et De Boeck, 2003 ; De Boeck et al., 2006). L’approche du problème de la libre circulation des poissons en rivière se situe dans un contexte régional (Nouveau Code wallon de l'Eau),mais aussi international : Décision Benelux d'avril 1996 (Benelux, 1996-1999), Plans d'Action Meuse de la Commission Internationale de la Meuse-CIM (CIM, 2001 et 2002), Implications de la Directive Cadre sur l'Eau quant à la qualité écologique des eaux de surface (Guyon et al., 2006), Perspective de plans d’actions pour le sauvetage de l’anguille européenne (Belpaire, 2005). Vu l'état actuel d'avancement de toutes les études et actions menées en Région wallonne en cette matière, nous proposons dans le présent dossier de synthèse une analyse des options de gestion applicables aux espèces de poissons les plus concernées de notre ichtyofaune ainsi qu'une sélection des aménagements à évaluer en vue d’une amélioration et/ou à réaliser en priorité en fonction de différents critères. [less ▲]

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See detailField protocol for assessing small obstacles to migration of brown trout Salmo trutta, and European grayling Thymallus thymallus: a contribution to the management of free movement in rivers
Ovidio, Michaël ULg; Capra, Hervé; Philippart, Jean-Claude ULg

in Fisheries Management and Ecology (2007), 14(1), 41-50

Between 1996 and 2004, adult brown trout, Salmo trutta L. (n = 40) and European grayling, Thymallus thymallus (L.) (n = 39) were radio-tracked in three southern Belgium rivers to assess their capabilities ... [more ▼]

Between 1996 and 2004, adult brown trout, Salmo trutta L. (n = 40) and European grayling, Thymallus thymallus (L.) (n = 39) were radio-tracked in three southern Belgium rivers to assess their capabilities to bypass various obstacles. During their upstream migrations individuals encountered different types of physical obstacles and successfully passed some under variable environmental conditions. The obstacles cleared by the fish were characterised based on a simple topographical description protocol and compared with tracking data. The ability of trout and grayling to pass different typologies of physical obstacles in natural river systems is discussed in the context of enabling their free movement in rivers. [less ▲]

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See detailMobility and home-range use of Atlantic salmon parr over short time scales
Ovidio, Michaël ULg; Enders, Eva C.; Hallot, Eric ULg et al

in Aquatic Living Resources (2007), 20(1, JAN-MAR), 95-101

This study performed in the Patapedia River (Quebec, Gaspesie) was designed to examine the space utilization and mobility patterns of individual Atlantic salmon parr over short time scales with frequent ... [more ▼]

This study performed in the Patapedia River (Quebec, Gaspesie) was designed to examine the space utilization and mobility patterns of individual Atlantic salmon parr over short time scales with frequent detections of position. In August 2004, n = 7 radio-tagged Atlantic salmon parr were located every 20 min during 10 tracking periods chosen to take into account the dawn, day, dusk and night periods. Parr showed important inter individual variability in space utilization and mobility patterns, occupying large home ranges (123 to 5602 m(2)) and sometimes migrating 2 km upstream in the river. No differences were observed in the mean distance travelled among the four daily periods by individual fish, but the estimated home ranges utilized during the four daily periods overlapped only partially, demonstrating that parr partly occupy different areas of the river during different parts of the daily cycle. The results suggest that an intense survey on a small number of fish may contribute to a complementary comprehension of space utilization and mobility patterns of Atlantic salmon parr when viewed in association with results from studies surveying larger number of fish at lower frequency. [less ▲]

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See detailRegulated discharge produces important changes of fish community in the grayling zone of a small salmonid stream.
Ovidio, Michaël ULg; Capra, Hervé; Orban, Patrice et al

Conference (2006, June)

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See detailMobility and spawning migration of roach in three fragmented rivers in Belgium
Geeraerts, Caroline; Verbiest, Hilde; Buysse, David et al

Conference (2006, June)

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See detailImpacts de la mise en service d'une microcentrale hydroélectrique sur les populations de poissons de la Lhomme à Poix Saint-Hubert
Ovidio, Michaël ULg; Philippart, Jean-Claude ULg; Paquer, Frédéric ULg et al

Report (2006)

Ce rapport présente une partie des résultats des recherches menées dans le cadre d’une convention d’études 2005-2007 entre le Ministère de la Région Wallonne (Division de l’Eau, Direction des Cours d’Eau ... [more ▼]

Ce rapport présente une partie des résultats des recherches menées dans le cadre d’une convention d’études 2005-2007 entre le Ministère de la Région Wallonne (Division de l’Eau, Direction des Cours d’Eau Non Navigables) et l’Université de Liège (Laboratoire de Démographie des Poissons et d’Hydroécologie, Unité de Biologie du Comportement). L’objet particulier de la recherche évoquée est le suivi biologique de la population piscicole de la Lhomme à Poix Saint-Hubert après la construction et la mise en service en fin 2002 d’une microcentrale hydroélectrique par la société S.A. Hydroval. La réalisation de cette étude correspond à une étude d’impact a posteriori, dont la réalisation conditionnait l’octroi du permis d’exploitation. Cette recherche très ciblée est une composante d’une convention d’études générale intitulée « Définition de bases biologiques et éco-hydrauliques pour la libre circulation des poissons dans les cours d'eau non navigables de Wallonie ». [less ▲]

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