Water Hyacinth has been ...
Published by Harry Beyer, Principal Water Engineer
Water Hyacinth has been recognised as an invasive weed in northern Australia. The control measures used can be seen on the link:
...https://www.daf.qld.gov.au/__data/assets/pdf_file/0005/54680/IPA-Water-Hyacinth-PP6.pdf
The control measures, especially biological controls, have been very successful here. What is appropriate and possible in your situation will require careful consideration.