Browsing by Author "Mwakalinga, Aggrey B."

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    To connect or not to connect – floods, fisheries and livelihoods in the Lower Rufiji floodplain lakes, Tanzania.
    (2011) Hamerlynck, Oliver; Duvail, Stéphanie; Vandepitte, leen; Kindinda, kassim; Nyingi, Dorothy W.; Paul, Jean-Luc; Yanda, Pius Z.; Mwakalinga, Aggrey B.; Mgaya, Yunus D.; Snoeks, Jos
    t For seven years, village-based recorders monitored fish catches and water levels in seven floodplainassociated lakes of the Lower Rufiji, Tanzania. The lakes differ in the number of days and volume of inflows from the river, and thus provide a natural experiment to explore the links between catch composition, income per hour of fishing (IPHF) and hydrological connectivity, and to analyse the response of the users. The fishers adapt their fishing mode and equipment to achieve a rather constant IPHF of between 0.2 and 0.8 US$/fisher/hour. In situations of low connectivity, during a series of drought years, the less well-connected lakes lost many species and became a virtual monoculture of Oreochromis urolepis. Only in one extreme case was average fish size significantly reduced, indicating a high fishing pressure. Catch was therefore highly resilient to shifts toward illegal, non-selective and active fishing techniques. Fish diversity and lake productivity were quickly re-established when the larger lakes reconnected. The potential impacts of changes in the flood hydrograph (through dams, increased abstraction or climate/land-use changes) are assessed, and management options discussed
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    To connect or not to connect? Floods, fisheries and livelihoods in the Lower Rufiji floodplain lakes, Tanzania
    (Taylor & Francis Group, 2011-12) Hamerlyncka, Olivier; Duvail, Stéphanie; Vandepittec, Leen; Kindindad, Kassim; Nyingie, Dorothy W.; Paulb, Jean-Luc; Yanda, Pius Z.; Mwakalinga, Aggrey B.; Mgaya, Yunus D.; Snoeksi, Jos
    For seven years, village-based recorders monitored fish catches and water levels in seven floodplain-associated lakes of the Lower Rufiji, Tanzania. The lakes differ in the number of days and volume of inflows from the river, and thus provide a natural experiment to explore the links between catch composition, income per hour of fishing (IPHF) and hydrological connectivity, and to analyse the response of the users. The fishers adapt their fishing mode and equipment to achieve a rather constant IPHF of between 0.2 and 0.8 US$/fisher/hour. In situations of low connectivity, during a series of drought years, the less well-connected lakes lost many species and became a virtual monoculture of Oreochromis urolepis. Only in one extreme case was average fish size significantly reduced, indicating a high fishing pressure. Catch was therefore highly resilient to shifts toward illegal, non-selective and active fishing techniques. Fish diversity and lake productivity were quickly re-established when the larger lakes reconnected. The potential impacts of changes in the flood hydrograph (through dams, increased abstraction or climate/land-use changes) are assessed, and management options discussed.
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    To connect or not to connect? Floods, fisheries andlivelihoods in the Lower Rufiji floodplain lakes,Tanzania
    (http://www.tandfonline.com/, 2011-12-16) Hamerlynck, Olivier; Duvail, Stéphanie; Vandepitte, Leen; Kindinda, Kassim; Nyingi, Dorothy W.; Paul, Jean-Luc; Yanda, Pius Z.; Mwakalinga, Aggrey B.; Mgaya, Yunus D.; Snoeks, Joe
    For seven years, village-based recorders monitored fish catches and water levels in seven floodplain-associated lakes of the Lower Rufiji, Tanzania. The lakes differ in the number of days and volume of inflows fromthe river, and thus provide a natural experiment to explore the links between catch composition, income per hour offishing (IPHF) and hydrological connectivity, and to analyse the response of the users. The fishers adapt their fish-ing mode and equipment to achieve a rather constant IPHF of between 0.2 and 0.8 US$/fisher/hour. In situationsof low connectivity, during a series of drought years, the less well-connected lakes lost many species and became avirtual monoculture ofOreochromis urolepis.Only in one extreme case was average fish size significantly reduced,indicating a high fishing pressure. Catch was therefore highly resilient to shifts toward illegal, non-selective andactive fishing techniques. Fish diversity and lake productivity were quickly re-established when the larger lakesreconnected. The potential impacts of changes in the flood hydrograph (through dams, increased abstraction orclimate/land-use changes) are assessed, and management options discussed.