In the USA, NASA ran a ...

In the USA, NASA ran a program which used water hyacinth for conversion to biofuel. The resultant byproduct is methane which can be used to subsidize natural gas supplies; or; processed and manufactured as a primary energy source. The methodology was simple manual harvesting; shredding; then biological digestion; from which collection and filtering of the raw gas yielded pure methane (natural gas). The only downside in the NASA project was insufficient supply of water hyacinth. It would seem that you have an abundant raw alternative energy source at hand which could provide a twofold benefit . I concur with our other professionals that nutrient prevention and removal and non-chemical eradication are sound advisement. Also, this could provide another job market for your country.