due to development, vegetated littoral areas in and adjacent to lake osborne have been reduced to a fragment of their original size. the lake shorelines predominantly consist of bare sand or mowed grass and exotic and/or invasive vegetation. john prince park maintains a lawn like appearance for the majority of the shorelines of lake osborne. within the water column exotic vegetation, such as water lettuce (pistia stratiotes), water hyacinth (eichhornia crassipes), hydrilla (hydrilla verticillata), and now hygrophila (hygrophila spp.), pose an ongoing nuisance and are treated with aquatic herbicides. with the loss of aquatic habitat, fish populations within the lake are becoming more represented by rough species, such as tilapia (tilapia sp. and oreochromis sp.).