Papers by Raymond Ouedraogo
Growth, and Stock Status Assessment of African Catfish, <i>Clarias anguillaris</i> (Linnaeus, 1758) from Burkina Faso Newly Man-Made Lake Samandeni
Advances in Bioscience and Biotechnology
Tropicultura, 2021
La gestion de la pêcherie du réservoir de Samandeni au Burkina Faso, nouvellement mise en eau en ... more La gestion de la pêcherie du réservoir de Samandeni au Burkina Faso, nouvellement mise en eau en 2017 nécessite des informations fiables qui sont pour l’instant éparses, insuffisantes voire inexistantes. Ce travail vise à combler ce gap à travers une analyse de la diversité, des paramètres de croissance et d’exploitabilité de la faune piscicole de ce réservoir. Pour ce faire, les poissons ont été échantillonnés au filet maillant et épervier entre avril 2018 et janvier 2019. Les espèces ont été identifiées et chaque poisson a été pesé puis mesuré. Au total 39 espèces ont été recensées et regroupées en 29 genres et 14 familles. Les familles les plus représentées sont Cichlidae, Mormyridae et Mochokidae. Les espèces dominantes sont Sarotherodon galilaeus Siluranodon auratus, Schilbe intermedius, Coptodon zillii et Oreochromis niloticus. L'étude suggère que les poissons et cet écosystème aquatique sont dans de bonnes conditions. Les résultats de cette étude contribueront à mieux pla...
Riverine Ecosystem Management, 2018
Burkina Faso (BF) is a Sahelian country located in West Africa on the arid southern rim of the Sa... more Burkina Faso (BF) is a Sahelian country located in West Africa on the arid southern rim of the Sahara. In this region all work and movement revolve around water and its availability, whether in nature or society. The aquatic ecosystems responsible for storing and replenishing the quantity and quality of water are vital for the productivity
Journal of Water Resources and Ocean Science
Fish populations and the exploitation of water bodies data are essential for the implementation o... more Fish populations and the exploitation of water bodies data are essential for the implementation of sustainable fisheries management strategies. Thus, fish diversity, fisheries production and fishermen's income in the «Mare aux Hippopotames» located in western Burkina Faso were studied. This study aims to characterise the fish fauna and fisheries in this natural lake. From 12 to 16 May 2020, experimental fishing was conducted using gillnets with mesh sizes of 10, 20, 35 and 40 mm and cast-nets in five stations. Supplementary data were collected within 22 commercial fishing landings. In total, 1642 fish individuals belonging to 29 species were collected. Twenty-two genera and 13 families were identified. Sarotherodon galilaeus is the dominant species (46.83%) followed by Oreochromis niloticus (11.02%), Brycinus nurse (10.66%). The fish fauna is quite varied and reflects the characteristics of the tropical fish fauna. Length-weight relationship revealed that some fish species have allometric growth while others have isometric growth. The density of fishermen, which is between 0.18 and 0.36 fishers per hectare shows a moderate pressure on the reservoir. The total production of the lake is estimated at 47.85 tonnes per year, i.e. an average yield of 398.78 kg. ha-1. The average annual income of the fisherman is estimated at 528,000 FCFA.
Journal of Applied Biosciences, 2020
Objectif : Fournir les premières données sur l’ichtyofaune du réservoir de Samandeni avant son ou... more Objectif : Fournir les premières données sur l’ichtyofaune du réservoir de Samandeni avant son ouverture à la pêche à travers l’étude de la relation longueur-poids et de facteur de condition de sept espèces dominantes dudit réservoir. Méthodologie et résultats : Les poissons ont été collectés entre avril 2018 et janvier 2019 à travers des pêches expérimentales aux filets épervier et maillant. Sept espèces dominantes du réservoir à savoir Sarotherodon galilaeus (Mango tilapia), Coptodon zillii (Redbelly tilapia), Oreochromis niloticus (Tilapia du Nil), Marcusenius senegalensis (Trunkfish), Synodontis schall (Wahrindi), Schilbe intermedius (African butter catfish) et Brycinus nurse (Nurse tetra) ont été soumises à l’étude de la relation longueur-poids (RLP) et de facteur de condition. Les régressions longueur-poids, appliquées ici, ont donné des coefficients d’allométrie situés entre 2,86 et 3,20 avec des coefficients de détermination qui varient de 0,7312 à 0,9443. Conclusion et appl...
Sustainability, 2021
Small-scale inland fisheries are essential for livelihoods and food security in developing countr... more Small-scale inland fisheries are essential for livelihoods and food security in developing countries such as Burkina Faso. However, there is a gap in research on the ongoing transformation of the sector toward sustainability. This article analyzes the transition in inland fisheries and aquaculture in Burkina Faso and its implications in terms of natural resources management, food security, and livelihoods. We used the Multi-Level Perspective (MLP) method as a reference transition framework and sampled using a mixed approach including 63 qualitative interviews, with fisheries experts and stakeholders, as well as quantitative data gathered through a representative survey with 204 fishermen’s households. We examined open access, concession, and co-management fisheries systems. Our results show that technical and institutional changes in fisheries over the last decades deeply shaped and transformed fisheries governance. Technological changes improved the sector’s productivity and its co...
Mining the past for a better future of African waters: Historical changes in the fish and fishery of Lake Bam (Burkina Faso) before rehabilitation
African Journal of Environmental Science and Technology, 2020
Terrestrial waters provide multiple goods and services to human kind, but they have been severely... more Terrestrial waters provide multiple goods and services to human kind, but they have been severely diminished by increasing human exploitation of water and the landscapes surrounding aquatic communities. This research illuminates such dynamics in the recent history of exploitation of the Lake Bam fishery in Burkina Faso. To do so, from 2009 to 2015 we collected data on the ecology, exploitation and governance of the Lake Bam fishery. Direct sampling of fish documented the erosion of fish diversity and the reduction of fish size and the number of landings. Interviews with leaders of riverside community suggest a halting and uncertain transition in the governance of natural aquatic resources from the traditional (pre-colonial) approach to a republican (European democratic) one. The number of fishermen exceeds the fishery’s carrying capacity, but the number of fishermen continues to rise, driven by the low level of opportunities in alternative livelihoods. National and international aw...
A synthetic overview of the SUSFISH project (Sustainable Management of Water and Fish Resources in Burkina Faso): society meets ecology. Final Report
Towards Shared Research, 2020
In response to threats of chronic water scarcity and episodes of severe and long-term drought, th... more In response to threats of chronic water scarcity and episodes of severe and long-term drought, the government of Burkina Faso started to create a widely dispersed network of water storage facilities throughout the whole country in 1950. As fisheries, these reservoirs have also become important new sources of food (Petit et al. 2009, Venot et al. 2011). However, there exist several threats to the services, e.g. fish and water quality, that these artificial aquatic sources provide (CNID-B. 2010a&b, Mahé et al. 2005). The predominant ones are overfishing, intensive agricultural activities around the water resources and the process of sedimentation. Within the framework of the Burkinabè national development programme, attaining food security and providing drinking water are central to the government's national development policies and strategies. Thus, to establish a sustainable management of natural and human-made aquatic systems, the responsible Ministry of Agriculture, Water and Fish Resources in Burkina Faso started to develop an integrative water and fish management strategy, which required methods and tools for the standardized assessment of the water quality and ecological status of rivers (MAHRH 2003, 2006). The implementation and further development of this strategy requires personnel trained in management and the science that underpins its tools of data collection and analysis. In the framework of Austrian development
Advances in Bioscience and Biotechnology, 2021
Reliable and basic information on fish are required for the sustainable management of a fishery. ... more Reliable and basic information on fish are required for the sustainable management of a fishery. For this reason, the fish fauna of the future reservoir of Ouessa in the low section of the Mouhoun River, Burkina Faso is studied. In order to describe the fish community, the fish were sampled in March 2020 thanks to cast nets and gill nets. They were sorted into species and each fish was weighted at the nearest 0.1 g and its total length measured at the nearest mm. The landings of commercial fishermen were also observed. In total, 1059 fishes were collected and grouped into 42 species, 27 generas and 16 families. The dominant species were Synodontis nigrita, Synodontis schall, Marcusenius senegalensis, Schilbe intermedius, Brycinus nurse and Alestes baremoze. However, the compilation of diverse sources suggests the presence of nearly 70 species. The index of Shannon-Weaver (3.97), the values of the condition factor, the fish size and the presence of intolerant species indicate the relatively good conditions of the aquatic ecosystem. Among the 24 dominant species, 54% have a positive allometric growth, 42% a negative allometric growth and 0.04 an isometric growth. This study builds the basis of sustainable management of the future reservoir of Ouessa that is planned to be the largest one of the country (40,000 ha large).
International Journal of Biological and Chemical Sciences, 2020
The insufficiency of information on fish assemblages has limited the ability to carry out effecti... more The insufficiency of information on fish assemblages has limited the ability to carry out effective conservation measures, hence failing to address economic and ecological roles of fish. Therefore, the present study aimed at characterizing the fish community in the upper part of Volta River basin and drawing up their influence on fisheries" sustainability. From 2009 to 2014, fish individuals were collected in nine sampling areas belonging to the Volta catchment, mainly in the catchment of Nakanbé and Mouhoun rivers that are the two major tributaries. More than 40,000 fish specimens were collected in over 600 mesohabitats by using several types of fishing gears (gill nets, cast nets, long lines and electric fishing gears). Altogether, 79 fish species belonging to 41 genera grouped in 19 families were identified. The most common species were Enteromius macrops (50.71%), Brycinus nurse (35.32%), Enteromius ablabes, Oreochromis niloticus (47.10%), Sarotherodon galilaeus (47.88%) and Coptodon zillii (42.23%). The fish species richness varied according to the sampling area. The main trend is that the protected area of Nazinga is the most diverse thus would be regarded as an appropriate refuge for fish species.
Environmental Monitoring and Assessment, 2017
Awareness of sustainable management of water and its biological resources is rising in West Afric... more Awareness of sustainable management of water and its biological resources is rising in West Africa, but application of effective tools for biomonitoring and detecting habitats at risk in aquatic ecosystems is limited. In this study, we provide key environmental descriptors to characterize reference sites by applying the following Ba priori criteria^(physical and chemical, hydromorphological, and land use parameters) by exploring their potential to determine suitable reference sites. Using data collected from 44 sites, we identified 37 criteria that reliably identify reference conditions in semi-arid rivers by reflecting the impacts of multiple pressures ranging from low to very high intensity of human uses and impairments. We integrated all these impacts in an overall pressures index, which showed that protected areas can reasonably be considered as credible reference sites as far as they show low overall impact levels from cumulative pressures. We recommend that development of bio-indicator standards should be based on the collection and integration of all the available information, especially quantitative, spatially-explicit data, from benthic macroinvertebrates and fish. Rigorous standardization of bio-indicator protocols will make them more easily applicable for management and conservation of aquatic ecosystem resources in semi-arid zones of Africa.
Sustainability, 2019
Human pressures and loss of natural fish habitats led to a decline in fish populations in terms o... more Human pressures and loss of natural fish habitats led to a decline in fish populations in terms of abundances, biodiversity, and average size in sub-Sahelian Burkina Faso. Little knowledge exists about fish assemblages regarding their composition, their habitat preferences, or their sensitivity to or tolerance of human pressures. This research provides the first data-driven basis for sustainably managing fish and associated aquatic and terrestrial habitats. Surveys in four different regions sampled 18,000 specimens from 69 species during the dry season. Fish communities, available abiotic habitat conditions, habitat use, and human pressures were assessed and analyzed. Fish communities cluster into four distinct types, each dominated by either Cichlidae, Clariidae, Cyprinidae, or Alestidae and accompanied by specific other families and genera of fish. Habitat preferences of four key species (Labeo coubie, Bagrus bajad, Chelaethiops bibie, and Lates niloticus) were linked to ecologica...
International Journal of Biological and Chemical Sciences, 2018
La relation poids-longueur et le facteur de condition sont des paramètres ayant plusieurs utilité... more La relation poids-longueur et le facteur de condition sont des paramètres ayant plusieurs utilités en biologie des poissons et en gestion des pêcheries. Un échantillonnage a été fait pendant huit jours dans le lac Bam et le réservoir de la Kompienga pour étudier la relation poids-longueur et le facteur de condition de Clarias anguillaris et de Sarotherodon galilaeus. Une différence significative de poids et de longueur existe entre les populations des deux sites. Les populations du réservoir de la Kompienga ont une longueur plus grande que celle du lac Bam. La croissance de C. anguillaris est allométrique positive dans les deux sites. Pour S. galilaeus la croissance est allométrique négative au lac Bam mais s'avère positive au réservoir de la Kompienga. Pour C. anguillaris, une différence significative du facteur de condition existe entre le lac Bam et le réservoir de la Kompienga. Par contre, pour S. galilaeus aucune différence significative n'existe entre le lac Bam et le réservoir de la Kompienga. Le modèle de croissance dans le lac Bam comparé à celui du réservoir de la Kompienga explique le niveau avancé de dégradation de l'écosystème du lac Bam.
Journal of Applied Biosciences, 2016
RESUME Objectif : Ce travail vise à caractériser l'assemblage des espèces de poisson du lac de Hi... more RESUME Objectif : Ce travail vise à caractériser l'assemblage des espèces de poisson du lac de Higa, un site Ramsar du Burkina Faso, et à identifier, à partir des connaissances des pêcheurs, les espèces qui sont éteintes. Méthodologie et résultats : En mai 2012 nous avons échantillonné les poissons au moyen de filets épervier et observé les captures de la pêche commerciale. Nous avons aussi organisé un atelier avec les pêcheurs. Le peuplement piscicole était composé de 9 familles largement dominées par les Cichlidae (86%) et 18 espèces avec une abondance de Oreochromis niloticus (56%) et de Sarotherodon galilaeus (23%). Trois espèces de la famille des Cichlidae présentent le plus fort embonpoint : Sarotherodon galilaeus (facteur de condition K = 1,94), Oreochromis niloticus (K = 1,88) et Tilapia zillii (K = 1,80). Les pêcheurs ont unanimement déclaré que Lates niloticus et Heterotis niloticus ont disparus du lac. Conclusions et application des résultats : L'écosystème aquatique de Higa présente des signes de dégradation. Les programmes de conservation en cours méritent d'être poursuivis et améliorés pour assurer une meilleure protection et une exploitation durable des ressources aquatiques. La conscience écologique des pêcheurs suggère qu'ils peuvent être responsabilisés dans cette tâche.
8.2.3 Joint research and scientific exchange for higher education
Appear, 2015
8.2.2 A transdisciplinary approach to the integration of people, fisheries, socio-economic factors and higher education
Appear, 2015
Ecological Engineering, 2012
This research evaluates fish assemblages in both impacted and protected areas in tropical seasona... more This research evaluates fish assemblages in both impacted and protected areas in tropical seasonal small rivers in Burkina Faso. The study zones were, respectively, in the much-impounded area of Koubri close to the capital city Ouagadougou and in the protected Ranch of Nazinga along Burkina's southern border with Ghana. The impacts on these assemblages were evaluated in terms of seasonal changes in fish and the disruption of dams as an opportunity for fish to migrate. Burkina Faso is a leading country in reservoir creation in Africa and this is the first time the impacts of these reservoirs as fish barriers have been evaluated. Analyses of comparative seasonality, electric and traditional fishing equipment are provided. A total of 35 fish species were recorded in the 14 reservoirs impacted by intense agriculture and commercial fishing. In contrast, the protected area of Nazinga recorded 48 species with a higher frequency of intolerant species, e.g. Sarotherodon galilaeus. Altogether 56 species within 16 families were recorded. Average fish size for most of the species was significantly smaller in Koubri than in Nazinga. Accidental dam breaks have impacted fish assemblages in a manner similar to dam removal. Habitat improvement and unobstructed migration to the main river have increased the number of species in comparison to the previous situation of impoundment by 30%. The results of this research make important contributions to the integration of information concerning fish ecology and land use in semi-arid areas of Africa.
International Journal of Biological and Chemical Sciences, 2016
La connaissance de la ressource est un préalable à une gestion durable de pêche. Le présent trava... more La connaissance de la ressource est un préalable à une gestion durable de pêche. Le présent travail vise à caractériser le peuplement piscicole de la petite retenue d'eau de Boalin (Ziniaré, Burkina Faso) quelques années après que Heterotis niloticus y a été introduit. La méthodologie utilisée était l'interrogation des pêcheurs et l'échantillonnage des poissons au début de la saison sèche 2013 et en saison pluvieuse 2014. Ce qui a permis de comprendre les conditions qui ont prévalu à l'introduction de Heterotis niloticus et d'analyser les variations temporelles du peuplement piscicole. H. niloticus n'a pas survécu à Boalin. Les pêcheurs ont affirmé que rien de concret n'a été mis en oeuvre pour la réussite de l'introduction et que leurs connaissances sur les exigences écologiques de l'espèce sont très limitées. La diversité spécifique des poissons est plus élevée en saison pluvieuse qu'en saison sèche : sur un total de 22 espèces répertoriées, 13 ont été observées en saison sèche contre 19 en saison pluvieuse. La croissance est apparue allométrique négative avec une constante b de la relation longueur-poids inférieure à 3 chez la plupart des espèces retrouvées dans les captures des deux saisons.
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Papers by Raymond Ouedraogo