A mat of weeds up to 4in thick is affecting the River Witham in Lincolnshire.
Rodney Bowles, who runs day trips on the river in the Boston Belle boat, said the weeds "stink".
The vehicles are being used four days a week on the River Witham in Boston after plants covered the surface of the waterway. "To be honest we're overwhelmed. We are spending sort of £80,000 this year on weed boats four days a week in order to try and clear a passage through.Azolla can reduce oxygen in the water and harm fish and other aquatic life. Each plant can double in size every three days.The weeds are affecting wild life and some smaller boats"It's contaminated the river," he said."You can smell it. People walk past here it's horrible.
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