sentences:  In addition, a large number of water hyacinths floating in the water will block sunlight from entering the water, and after decay, it will consume a lot of dissolved oxygen in the water, pollute the water quality, and cause a large number of deaths of other aquatic plants.The outbreak of water hyacinth has seriously affected the biodiversity of the local ecosystem and threatened the production, life and health of community residents.In Iraq, water hyacinth which was imported in the 1990s as a decorative plant, caused major problems for water supply systems and fishermen at the Euphrates.