A cost-effectiveness evaluation of water hyoncith control methods: The case of Lake Kyoga and victoria Ecosiptems in Uganda.

Abstract

The water hyacinth was first reported on Lake Kyoga in 1988. Given its high proliferation rate it has spread to cover about 70,000 and 20,000 hectares on Lakes Victoria and Kyoga, respectively. It has inflicted enormous negative effects that include: increased evapo- transpiration that has reduced the water table; physical obstruction of water transport means loss in quality of fish and other products leading to reduced incomes: increased operational costs attached to fishing activities resulting from loss of nets and boat engine breakdowns; reduced fish reproduction; and being a breeding ground for many disease-causing organisms. These effects have in turn affected the national economy; the environment and the health status of lakeshore residents and have resulted in its condemnation. Four control methods, namely, biological, chemical, manual and mechanical have been tried in Uganda at different sites. Comprehensive economic data on costs and effectiveness of the four methods are...