http://news.nationalgeographic.com/news/2003/03/0303_030303_hyacinth_2.html
Peter Massyn of the local Ezimvelo Branch has confirmed that hyacinth only eating bugs have been deployed in the Banana Beach river.
He has advised the removed hyacinth must not be burnt, as this will kill the bugs.
The link above is from National Geographic and holds a wealth of information regards the worldwide hyacinth problem.