Invation of water hyacinth (eichornia crassipes) in the surface water of tondano lake

The study was conducted to examine the distribution of the invasion of water hyacinth on the lake surface Tondano. Research methods spatial approach to the analysis and interpretation process of digitization of satellite imagery application SIGs that ArcGIS 10. The data used are: Landsat satellite image of Quick bird with a spatial resolution of 0.6 meters recording in 2006 and 2011. Based on the results obtained image interpretation, the distribution of water hyacinth invasion (Eichornia crassipes) has grown and spread of high speed, so the plant is considered a weed that damages aquatic environments and greatly contribute to water quality, lake eutrophication and silting process. The rate of spread of water hyacinth is different in each observation station, due to differences in content of nutrients, especially nitrogen and phosphate in the water. Based on the analysis of satellite imagery interpretation and digitization of 2006 wider distribution of water hyacinth 130.77 hectares or 2.82% in 2011 and increased to 292.66 hectares or 6.32%. This means that during the period 2006 - 2011 water hyacinth increased by 161.89 ha with an average annual growth of 32.38 Ha. Based on the data rate distribution hyacinth invasion, may predict the next few years will be entirely Tondano lake surface is covered by water hyacinth management if no serious action.