Restoring Mwanza Gulf KBA: Community-Led Removal of Invasive Salvinia spp. in Lake Victoria
Author: Festus Massaho
- Over 1000 tonnes of invasive Salvinia spp. removed from Mwanza Gulf KBA
- Improved transport and fishing activities previously blocked by the invasive plant
- Strengthened multi-stakeholder collaboration with government and research institutions
- Protection of a Key Biodiversity Area and Important Bird Area (IBA)
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Ongoing efforts to ensure long-term ecosystem recovery
The Mwanza Gulf Key Biodiversity Area (KBA), an ecologically important part of Lake Victoria and also recognized as an Important Bird Area (IBA), has been increasingly threatened by the rapid spread of invasive Salvinia species. These plants form dense floating mats that block sunlight, reduce oxygen levels, and disrupt aquatic ecosystems. In addition, the infestation severely affected transport systems and fishing activities, making it difficult for local communities to navigate and access fishing grounds.
According to research by Tanzania Fisheries Research Institute, Salvinia can triple in size within one week, making it one of the fastest-spreading invasive species in freshwater ecosystems. This rapid growth has made management efforts both urgent and challenging.
In response, Blue Victoria led a collaborative restoration effort, working with key institutions including National Environment Management Council, Lake Victoria Basin Water Board, Tanzania Plant Health and Pesticides Authority, and local government authorities from Misungwi and Sengerema Districts.
Through joint field operations and strong community participation, the initiative has successfully removed more than 1000 tonnes of Salvinia from affected areas. This has helped reopen water channels, restore fishing access, and improve habitat conditions for both aquatic species and bird populations.
The project has also strengthened community awareness on invasive species management and the importance of protecting freshwater ecosystems. The work is ongoing, with plans to scale up removal efforts and develop sustainable long-term control strategies.
