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Water hyacinth at Lake Naivasha disrupting fishing and tourism. [File, Standard]

The water hyacinth that started as envy to many in Lake Naivasha is now turning into a nightmare, choking the water body and paralysing various economic activities.

The invasive weed has covered nearly a third of the troubled water body, adversely affecting fishing and tourism activities.

Efforts by scientists to introduce beetles to contain the hyacinth years back failed with nutrients from nearby farms and informal settlement blamed for the fast spread of the weed.