water hyacinth (eichhornia) grows on lake

water hyacinth eichhornia grows lake invasive plant species american cleans reservoir phosphates prevents navigation vietnam macrophyte algae animal feed anthropogenic impact influence aquarium plants aquatic bad ecology bilge bionomics contaminating contamination danger difficulty crassipes environment environmental issue eutrophication fertilizer human lack oxygen macrophytes nature organic pollution protection river scenery sewage sewerage utrophication treatment winter