In Belgium's Sambre river, the banks of canalised watercourses are often artificial. Yet wild banks, where plant roots mingle with the water, are essential for fish, which lay their eggs, take refuge or find food there. The solution found by the Contrat de Rivière Sambre et Affluents (CRSA), which manages the fisheries resource, was to design rafts measuring 3m by 2.66 m made buoyant with two SDS-01040 double cubes, each weighing 175.5 kg. Helophytic plants of Walloon genetic stock - iris, sedges, phragmites and rushes - are planted in the screened area, with their abundant roots growing underwater. Fish benefit from this, as do amphibians, insects and birds that can nest there. Islands of biodiversity...

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