I'd tend to agree with keV regardless of floods streamer weed will regrow but lots of the river are totally devoid where it used to flourish, there used to be loads at otterspool all over the stretch an pearmill an paintmaster, I know there's a bit at watersmeet and there's plenty in the Mersey, as I remember the streamer weed vanished when the cray population was at it's peak, could be coincidence but I believe they were a major factor in it's disappearance, it should be easy enough to get it re established and what with the threat of predation by cormorants and gooseanders it can offer a great deal of protection
Cheers
Jerry

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The Barbel Society Lancashire Regional Organiser