References of "Ovidio, Michaël"
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See detailShort-term responses of glass eels transported from UK to small Belgian streams
Ovidio, Michaël ULg; Tarrago-Bes, Frédérique; Nzau Matondo, Billy ULg

in Annales de Limnologie = International Journal of Limnology (2015), 51(3), 219-226

Restocking of inland waters with glass eels is one of the recovery options to prevent the decline of European eel Anguilla anguilla (L.) populations. We studied the growth, dispersion, density and habitat ... [more ▼]

Restocking of inland waters with glass eels is one of the recovery options to prevent the decline of European eel Anguilla anguilla (L.) populations. We studied the growth, dispersion, density and habitat preferences in the imported glass eels from United-Kingdom and stocked in three typologically different small Belgian streams, using electrofishing surveys around the single release point, 1 year following stocking. Our results clearly support that the recaptured individuals stocked in our streams farther from the sea, survived, grew, dispersed upstream and downstream. Elvers exploited the complete transversal section of stream, with preference for the sheltered microhabitats near the banks with slower water velocity and low depth. Length-weight relationship was different between streams in terms of allometric coefficient (b). We assume that microhabitats and food availabilities lead to contrasted results in terms of growth and absolute occurrence. Restocking of glass eels in small middle-land streams was found to be an interesting and unconventional option that requires adequate stream and habitat selection. [less ▲]

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See detailHistorical evolution of fish biodiversity and capture periodicity in the River Meuse (Belgium) as revealed by 15 consecutive years of fishpass monitoring
Benitez, Jean-Philippe ULg; Dierckx, Arnaud ULg; Nzau Matondo, Billy ULg et al

Conference (2015, June)

In the River Meuse at 323km upstream from the North Sea, the hydroelectric dam of Lixhe (rated power of 5300KW) is equipped with two fishpasses: one pool and weir fishpass (in operation since 1980; 0.13m³ ... [more ▼]

In the River Meuse at 323km upstream from the North Sea, the hydroelectric dam of Lixhe (rated power of 5300KW) is equipped with two fishpasses: one pool and weir fishpass (in operation since 1980; 0.13m³.s-1 operating flow) and one vertical slot fishpass (in operation since 1998; 1m3.s-1 operating flow). Both fishpasses were scientifically monitored using capture traps during 15 consecutive years (from 1999 to 2014). The objective of the study is to analyse i) the evolution of fish stock and biodiversity over 15 years and ii) the capture periodicity of fish and it’s variation over years. During the considered period, we observed 36 species at adult stage (88597 individuals with 75% of cyprinids) and 13 species at juvenile (0+) stage (335067 individuals with 90% of cyprinids). Global results between 1999 and 2014 showed a drastic reduction in capture per year (>90%) for some species like Anguilla Anguilla, Alburnus alburnus, Blicca bjoerkna, Rutilus rutilus and Tinca tinca. Whereas other species have emerged like Aspius aspius and Silurus glanis. For the 0+, an important interannual variation is observed from few individuals to several tens of thousands per year. The comparison between both fishpasses indicated a greater use (>50%) of the vertical slot fishpass by rheophilic species and species that have good swimming ability. The analysis of capture periodicity for the most abundant species at adult stage demonstrated the presence of stable behaviours between years for the Abramis abrama and B. bjoerkna respectively a Q50 of the capture day of the year from 108th to 144th day at mean=17°C and from 118th to 155th day at mean=18°C. In contrast other species have patterns more variables (Barbus barbus: Q50 from 96th to 266th day; R. rutilus: from 10th and 309th day). Finally the 0+ exhibited a capture periodicity stable in time during the summer. [less ▲]

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See detailDoes yellow eel prefer old pool and weir or new vertical slot fish pass during their upstream migration?
Nzau Matondo, Billy ULg; Dierckx, Arnaud ULg; Benitez, Jean-Philippe ULg et al

Conference (2015, June)

The hydroelectric dam of Lixhe in the River Meuse, 323km upstream from the North Sea at the entry of Belgium near the frontier with the Netherlands is equipped with two basin fish-passes: – the old pool ... [more ▼]

The hydroelectric dam of Lixhe in the River Meuse, 323km upstream from the North Sea at the entry of Belgium near the frontier with the Netherlands is equipped with two basin fish-passes: – the old pool-and-weir configuration (OFP) operates at low discharge (0.13m3/s) and – the new vertical-slot configuration (NFP) operating at high discharge (1m3/s) with attraction flow (1.5m3/s). However, the utilization rate of these fish-passes by the incoming yellow eels remains unknown, because the trap of NFP is not adapted to retain anguillids and small species. Yet, such knowledge is crucial to improve the inland colonization of the species and to increase our understanding of fish-pass utilization given its particular swimming mode. In season 2013, eels caught two times a week using a cone-trap pool in the OFP and net traps in the NFP, were tagged and released the same day 0.3km downstream (n = 396eels). The utilization of OFP and NFP was studied using automatic RFID transponder detection antennas placed in upstream basins of the fish-passes, during years 2013 and 2014. Results revealed that the OFP was the preferred migration route of eels (eel numbers, OFP:NFP, 2013= 88:51 and 2014= 41:16, χ²-test, p<0.0001), which was also used earlier in season. Eels displayed fidelity to their catch fish-passes (>70% of the detected eels, annually). Detection rate was high in the year of eel tagging (2013: 35.1%) before decreasing in the following year (2014: 14.4%). Eels used these fish-passes the night from 22:00 to 04:00, at 14-26°C, river flow <200m³/s and whenever waxing and waning phases of moonlight. Our results provide insight into the utilization of fish-passes by migrating eels. The study suggests further reflection before removing the old fish-pass in large rivers and to think about the eel attractiveness and comfort when the construction of a new fish pass is planned. [less ▲]

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See detailAssessing the passage of obstacles by fish. Concepts, design and application
Baudoin, Jean-Marc; Burgun, Vincent; Chanseau, Matthieu et al

Book published by Onema - Editeur: Véronique Barre (2015)

The fragmentation of habitats has been acknowledged for 30 years as one of the five main factors of biodiversity loss, in conjunction with pollution, overuse of natural resources, invasive species and ... [more ▼]

The fragmentation of habitats has been acknowledged for 30 years as one of the five main factors of biodiversity loss, in conjunction with pollution, overuse of natural resources, invasive species and climate change. Since then, public environmental policies have strived to restore the connectivity of natural habitats. That is particularly the case for water policy, which has made the ecological continuity of rivers a central element in policy planning, a quality element for monitoring programmes and one of the basic guidelines for river-basin management plans (RBMP). The time has thus come for decisions, with the resulting controversy given that any attempt to modify existing discontinuities impacts our perception of landscapes and various uses of aquatic environments. Given that there is, on average, at least one obstacle for every five kilometres of river in continental France, this issue concerns the entire country, its population and all water managers. That explains why it was necessary to have a single set of standardised procedures for selecting the work to be done on the basis of objective and comparable data. For the ecological continuity of fish, we now have the ICE method presented in this book, which describes obstacles in rivers and assesses the capacity of fish to overcome those obstacles during their upstream migration. The design, development and national deployment of this method required five years of intense, collective effort on the part of numerous scientists and the Onema local and regional offices. The method is the result of an outstanding multi-disciplinary approach involving both hydraulics and ecology, two disciplines that some people might see as irreconcilable, but that must work together synergistically in the effort to restore environments. The publication of this book in the Knowledge for action series marks the transition from the team that developed the method to the people who will use it to acquire better understanding of ecological continuity in rivers and as an operational tool in implementing water policy and enhancing biodiversity. [less ▲]

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See detailThe ICE protocol for ecological continuity: a new tool to evaluate the upstream fish passage success at physical barriers
Ovidio, Michaël ULg; Larinier, Michel; Burgun, Vincent et al

Conference (2015, June)

The recording and classification of obstacles that can interfere with the movements and migrations of fish is critical information to plan river restoration program. To date a major problem is to ... [more ▼]

The recording and classification of obstacles that can interfere with the movements and migrations of fish is critical information to plan river restoration program. To date a major problem is to determine the potential effect of each obstacle and to select the problematic sites that should be improved to restore longitudinal connectivity (construction of fish passage facilities, removal or modification of the obstacles). Fish passage success about an obstacle is complex and depends on the hydraulic conditions over and at the foot of the obstacle in relation to swimming and leaping capabilities of the fish species concerned. This selection and classification is too often biased because managers lack information’s on the fish capabilities to leap physical obstacles. The need for a simple, reliable and standardised assessment method for use by a wide range of environmental stakeholders rapidly became evident. We responded to the challenge and developed the ICE protocol as the basis for the required ecological-continuity assessment method, particularly in the context of the European Water Framework Directive implementation. The ICE protocol coordinated by ONEMA is based on an integration of the topographical and hydraulic characteristics of obstacles with the physical capabilities (swimming, jumping or crawling) of the fish species analysed. It requires the gathering of standardised descriptive variables on each obstacle. The result of the analysis is an indication on the risks of a structure constituting a more or less severe obstacle (5 classes) for a given fish species (n=47) or group of species. Particular attention was paid to the practical aspects of the method (time required and necessary human resources) to facilitate its use in a wide variety of situations and areas. Each procedure is presented as a flow chart to assist in decision-making, thus making the protocol easy to use for a wide range of people. [less ▲]

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See detailMarques actives utilisées en télémétrie "poissons"
Tétard, Stéphane; Ovidio, Michaël ULg; Capra, Hervé et al

Scientific conference (2015, April 03)

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See detailEstimation de l’abondance du stock des anguilles recrutées par migration de remontée dans la Meuse en Wallonie et réalisation des essais de repeuplement en juvéniles. Rapport final du projet financé par le Fonds européen pour la Pêche (Code projet: 32-1102-002)
Nzau Matondo, Billy ULg; Philippart, Jean-Claude ULg; Dierckx, Arnaud ULg et al

Report (2015)

Ce rapport final présente les résultats des recherches menées par le Laboratoire de Démographie des Poissons et d’Hydroécologie (LDPH) de l’Unité de Biologie du comportement dans le cadre d’un projet co ... [more ▼]

Ce rapport final présente les résultats des recherches menées par le Laboratoire de Démographie des Poissons et d’Hydroécologie (LDPH) de l’Unité de Biologie du comportement dans le cadre d’un projet co-financé par le Fonds Européen pour la Pêche (FEP) et le Service Public de Wallonie, Département de la Nature et des Forêts (code projet : 32-1102-002) intitulé «Estimation de l’abondance du stock des anguilles recrutées par migration de remontée dans la Meuse en Wallonie et réalisation des essais de repeuplement en juvéniles. » [less ▲]

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See detailConvention relative à la réhabilitation du Saumon atlantique dans le bassin de la Meuse (Rapport 2014-2015)
Ovidio, Michaël ULg; Dierckx, Arnaud ULg; Benitez, Jean-Philippe ULg et al

Report (2015)

Le présent rapport d’activités intègre les travaux des deux équipes universitaires de Namur et de Liège dans la cadre de la convention relative à la réhabilitation du saumon atlantique dans le bassin de ... [more ▼]

Le présent rapport d’activités intègre les travaux des deux équipes universitaires de Namur et de Liège dans la cadre de la convention relative à la réhabilitation du saumon atlantique dans le bassin de la Meuse au cours de la période février 2014- janvier 2015 [less ▲]

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See detailEvaluation de l’impact d’une diminution de la température des rejets de la papeterie Burgo Ardennes sur le rendement de la station d’épuration des eaux usées et implication sur la qualité des eaux du Ton (aspects physico-chimiques et ichtyofaune)
Everbecq, Etienne ULg; Grard, Aline ULg; Deliège, Jean-François ULg et al

Report (2015)

Le présent rapport reprend l’étude de l’impact thermique sur le milieu aquatique de l’entreprise Burgo Ardennes, spécialisée dans la fabrication de pâte à papier et de papier couché. Durant son ... [more ▼]

Le présent rapport reprend l’étude de l’impact thermique sur le milieu aquatique de l’entreprise Burgo Ardennes, spécialisée dans la fabrication de pâte à papier et de papier couché. Durant son fonctionnement, l’entreprise prélève de l’eau du Ton (affluent de la Chiers) afin d’assurer les processus de fabrication de pâte à papier et de papier couché. Le prélèvement d’eau est réalisé au niveau de la confluence du Ton et de la Chavratte (environ 2 km en amont de l’entreprise). En 2010, dans le cadre d’une demande introduite par Burgo Ardennes sollicitant une modification des conditions particulières d’exploitation relatives au déversement des eaux usées de l’établissement, le SPW a demandé à Burgo Ardennes de réaliser une étude complémentaire (à celle réalisée en 2009) visant à évaluer l’impact réel d’une diminution de la température des rejets sur le rendement de la station d’épuration des eaux usées et l’implication sur la qualité des eaux du Ton. Il est précisé que l’étude doit porter sur les aspects physico-chimiques du milieu récepteur ainsi que sur l’ichtyofaune. Cette étude doit également aborder des solutions et en évaluer leur faisabilité technico-économique en cas de réduction de la température des eaux usées par la papeterie. Cette étude comprend 3 parties : 1. l’étude de l’impact d’une réduction de la température sur les rendements de la station d’épuration, partie réalisée par le CEBEDEAU ; 2. la caractérisation de l’ichtyofaune présente dans les cours d’eau influencés par les prélèvements et rejets d’eau de Burgo Ardennes et l’évaluation de l’impact sur les poissons du fonctionnement de la papeterie. Cette étude a été réalisée par le Laboratoire de Démographie des Poissons et d’Hydroécologie (LDPH) de l’ULg ; 3. la modélisation de la qualité de l’eau du Ton et de la Chiers en fonction des rejets de Burgo Ardennes et des résultats de l’étude du CEBEDEAU; cette modélisation a été réalisée par l’unité R&D de l’Aquapôle. Chaque partie a fait l’objet d’un rapport spécifique. Ce rapport reprend les résultats principaux de chacune des 3 parties, ainsi que les conclusions générales de l’étude. L’étude a été réalisée sur le Ton (dans lequel les rejets de Burgo Ardennes aboutissent) et sur la Chiers. Le Ton prend sa source à Châtillon, sillonne la Gaume sur 32 km avant de se jeter dans la Chiers. Son bassin versant s’étend sur 318 km². La Chiers débute son parcours dans la commune de Differdange au Grand-Duché de Luxembourg avant de passer en France. Elle devient transfrontalière belgo-française de Torgny à Ecouviez (où elle conflue avec le Ton) sur un tronçon de 4 km soit une très petite partie de son cours. Jusqu’à Remilly-Aillicourt, point de confluence avec la Meuse, elle parcourt une distance de 112 km et son bassin versant s’étend sur 2222 km². [less ▲]

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See detailGenetic structure of nase, Chondrostoma nasus, and common barbel, Barbus barbus (Teleostei, Cyprinidae) populations in South Belgium rivers: toward a rational management of conservation restocking
Gennotte, Vincent ULg; Michaux, Johan ULg; Prignon, Christian ULg et al

Poster (2014, December)

Nase (Chondrostoma nasus) and common barbel (Barbus barbus) are two rheophilic cyprinid fish naturally present in the Belgian Meuse and Rhine basins. During the last decades, the construction of dams ... [more ▼]

Nase (Chondrostoma nasus) and common barbel (Barbus barbus) are two rheophilic cyprinid fish naturally present in the Belgian Meuse and Rhine basins. During the last decades, the construction of dams together with changes in hydrological regimes, modifications of riverbed morphology and water pollution have caused some local dramatic declines in their populations. However, recent improvements in terms of water quality and habitat fragmentation allow considering as realistic a rational restocking plan of locally endangered patrimonial fish species such as nase and common barbel. Restocking operations for a conservation purpose have to be based on the knowledge and the use of wild type genetic strains. Therefore, the aim of this study was to characterize the genetic structure and diversity of nase and common barbel populations in South Belgium rivers. Wild common barbels (n = 313) and nases (n = 271) were sampled by electrofishing in respectively 10 and 6 different tributaries from the Meuse and Rhine rivers. Genotyping was performed on 24 microsatellite markers for each species. Preliminary results showed, for both species, a differential genetic clustering between fish originating from the Meuse basin and those originating from the Rhine basin. Detailed analysis describing the genetic structure and diversity of South Belgium populations will be presented and will serve as a management tool to set up a breeding plan for conservation restocking. [less ▲]

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See detailL’impact de la gestion des obstacles à la libre circulation des poissons
Ovidio, Michaël ULg

Conference (2014, November 13)

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See detailEvaluation de la qualité biologique des rivières wallonnes sur base des indices biologiques poissons. Support technique aux inventaires 2014.
Rimbaud, Gilles ULg; Ovidio, Michaël ULg; Dierckx, Arnaud ULg et al

Report (2014)

Ce rapport final présente les résultats des inventaires piscicoles effectués en juin-juillet et en septembre-octobre 2014 ainsi que le calcul des indices biologiques « poissons » (IBIP et EFI).

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See detailInformations sur la Continuité Ecologique - ICE -Evaluer le franchissement des obstacles par les poissons. Principes et méthodes
Baudoin, Jean-Marc; Burgun, Vincent; Chanseau, Matthieu et al

Book published by Onema (2014)

La fragmentation des milieux naturels est l’une des principales causes d’érosion de la biodiversité. L’impact des obstacles à l’écoulement se manifeste par une dégradation des milieux aquatiques et ... [more ▼]

La fragmentation des milieux naturels est l’une des principales causes d’érosion de la biodiversité. L’impact des obstacles à l’écoulement se manifeste par une dégradation des milieux aquatiques et consécutivement des biocénoses et des processus écologiques qu’ils abritent. Face aux exigences réglementaires (directive cadre sur l’eau, loi sur l’eau et les milieux aquatiques, grenelle de l’environnement, règlement européen de sauvegarde de l’anguille…) et à l'ensemble des enjeux environnementaux de la restauration de la continuité écologique des milieux aquatiques, l’Onema a souhaité développer un “outil ” permettant de diagnostiquer et quantifier les éventuels impacts des ouvrages hydrauliques sur la libre circulation de l'ichtyofaune. Le protocole ICE est une méthodologie nationale de production d’ “Informations sur la Continuité Ecologique” à destination des acteurs de l'environnement et de l'aménagement du territoire, des scientifiques, des enseignants, bureaux d’études et tout public intéressé. Il s'appuie sur une importante synthèse des connaissances scientifiques internationales actuelles et sur les productions scientifiques et techniques d’un groupe de travail composé d'experts français (Onema et Ecogea) et belge (Université de Liège). L'objectif de ce document est de présenter les enjeux de la continuité piscicole, les principes scientifiques qui ont prévalu à la construction de cette méthodologie d’évaluation, ainsi que le protocole standardisé qui a été développé. Il permet de diagnostiquer de manière simple et objective le risque d'entrave au déplacement de l'ichtyofaune en montaison, généré par les principaux types d'obstacles physiques à l’écoulement et pour les espèces communes des cours d'eau de France métropolitaine. Ce diagnostic repose sur la confrontation des caractéristiques typologiques, géométriques et hydrauliques des obstacles avec les capacités physiques de déplacement des espèces de poissons considérées. [less ▲]

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See detailMovements of endemic and exotic fish in a large river ecosystem (Rhône, France)
Capra, Hervé; Pella, Hervé; Ovidio, Michaël ULg

in Proceedings of the 10th International Conference on Ecohydraulics (2014, July)

The aim of this study is to characterise the mobility templates of two patrimonial species of rheophilic cyprinids (Barbus barbus and Squalius cephalus) and of a species of exotic fish, the catfish ... [more ▼]

The aim of this study is to characterise the mobility templates of two patrimonial species of rheophilic cyprinids (Barbus barbus and Squalius cephalus) and of a species of exotic fish, the catfish (Silurus glanis), in an area of the upper Rhône River characterised by significant disruptions of flow and thermal regimes (caused by hydroelectric and nuclear power plants). Results reveal contrasted mobility patterns, habitat uses and home-range sizes between endemic and exogenous fish species, but with a high interindividual variability. [less ▲]

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See detailUsing intensive multiyear fish-pass monitoring to analyse seasonal upstream movement patterns of patrimonial holobiotic potomadromous fish species in a medium size river
Benitez, Jean-Philippe ULg; Nzau Matondo, Billy ULg; Dierckx, Arnaud ULg et al

in Proceedings of the 10th International Conference on Ecohydraulics (2014, June)

Belgian rivers are fragmented by numerous obstacles which considerably limit the free access of fish to functional habitats. Fish-passes are major tools used to increase stream continuity and improve ... [more ▼]

Belgian rivers are fragmented by numerous obstacles which considerably limit the free access of fish to functional habitats. Fish-passes are major tools used to increase stream continuity and improve connectivity in the upstream direction. Using two modern multispecies fish-passes, this study aims to investigate multiyear abundance of holobiotic potamodromous fish and their seasonal movement patterns in relation with environmental factors. The fish passes were monitored continuously during 5 and 7 years and are located in two Belgian streams: the (19.3m³.s-1) and the Berwinne (1.9m³.s-1). Results revealed the presence of 20 different fish species, 14 species in the Berwinne and 19 species in the occurrence, salmonids and cyprinids species were predominant. A great interspecific and intraspecific variability in capture periodicity and in terms of stimulation by combination of factor environmental was observed. This study highlights the complexity and the omnipresence of holobiotic potamodromous fish movements at different life stages, in medium size river and brings new information on fish passes efficiency and use by these poorly known species. [less ▲]

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See detailArrival of european eel in Belgian Part of the Meuse: who and how are they?
Nzau Matondo, Billy ULg; Benitez, Jean-Philippe ULg; Dierckx, Arnaud ULg et al

in Proceedings of the 10th International Conference on Ecohydraulics (2014, June)

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