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Universität für Bodenkultur Wien (2010)

Fish and fisheries prospective in arid inland waters of Burkina Faso, West Africa

Ouedraogo, Raymond

Titre : Fish and fisheries prospective in arid inland waters of Burkina Faso, West Africa

Auteur : Ouedraogo, Raymond

Université de soutenance : Universität für Bodenkultur Wien

Grade : Doctoral Thesis 2010

Résumé
The conservation of inland waters is a great concern in nations occupying arid climatic zones such as Burkina Faso. Therefore, the main aims of this thesis were (1) to identify typical fish communities and to analyze anthropogenic impacts on waters, (2) to distinguish seasonal and fish sampling effects, (3) to analyze fishermen’s ecological awareness and (4) to develop concepts useful for developing policies for future management of waters and fisheries. From 2008 to 2009 the ecological situation affecting fish and fisheries was studied in four different areas in the Nakanbe river catchment - the heavily impacted Lake Bam, the fairly impacted area of Koubri, and the protected areas of Nazinga and Kompienga. More than 100 fishermen were interviewed about their knowledge on threats to waters. In addition, fish were sampled at 396 stations by using traditional and electro-fishing gears. It was determined that when used in appropriate waters, electric fishing and cast netting have similar efficiency in terms of assessing fish diversity. All together we sampled 56 fish species. The most common species were Barbus ablabes, Barbus macrops and Sarotherodon galilaeus. In Koubri, the species richness increased from the end of the dry season to the end of the rainy season from 19 to 30 species. Also significant seasonal shifts in fish size and abundance were found. The lotic waters exhibited 35 and the lentic ones 31 species. The free flowing section with a free fish passage to the main channel had the highest biodiversity (32 species) of all sampling areas. In the protected area 48 species occurred. Small species were dominant in river sections with a lot of anthropogenic activities (n =35). The most impacted area of Lake Bam exhibited only 20 species. While the Lake Bam fish assemblage was dominated by S. galilaeus, the average body size of this species remained very small. The study of the Bam system showed limitations in livelihoods, ecosystem and fishery management. Fishing is an additional but important activity for farmers. The fishermen were able to identify and describe factors that acted as drivers of pressures that impacted waters. They named irrigated vegetables farming and water abstraction as the most negative effects on fish. In response to the fish decrease, they introduce species, but till now all these effort has not been successful. In light of these declining trends, fishermen’s knowledge becomes increasingly important to improve efforts to conserve fisheries through more sustainable land use and water management

Mots clés : Burkina Faso / Wasser / Eingriffe / Fisch / Fischerei / Management / Ökologie / Biodiversität / Lebensgrundlage / Burkina Faso / waters / impacts / fish / fisheries / management / ecological awareness / biodiversity / livelihood

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Page publiée le 14 janvier 2015, mise à jour le 13 mars 2019