Water hyacinth, native to South America, is described as the world’s worst aquatic weed. It thrives in nutrient-enriched waters like Hartbeespoort Dam, forming dense impenetrable mats that affect boating, fishing and water sport activities, harms aquatic biodiversity. (Delwyn Verasamy/M&G)
Heavy rain and pollution has led to the aquatic weed increasing its coverage to about 50% of the dam
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