They also carry microorganisms that can be pathological to the water hyacinth. The invasion of water hyacinth also has socioeconomic consequences. A water hyacinth infestation is seldom totally eradicated. Harvesting water hyacinth mechanically requires a lot of effort. The overall effects of the water hyacinth, however, are still unknown. Bioherbicidal activity of "L. leucocephala" on terrestrial plants and aquatic weed water hyacinth were reported. They regularly clear debris water hyacinth from the intakes of the stations. "R. swinhoei" eats fish, crabs, snails, water hyacinth, frogs, and leaves. Rafts of harvested water hyacinth have been floated to the sea where it is killed. Water hyacinth have thus far affected only Lake Victoria. Since water hyacinth is comprised up of 95% water, the evapotranspiration rate is high. Water hyacinth have three flower morphs and are termed "tristylous". Notable examples include water hyacinth, salt cedar, and purple loosestrife. The water hyacinth has become a major invasive plant species in Lake Victoria.