Conservationists say the 'critically endangered' mussels are 'thriving' in the River Irt.
Populations have been affected by wildlife crime, habitat deterioration and declining water quality.
The glochidia clamp on to the gills of juvenile salmon or trout for about a year before landing on gravel where they bury and grow.
Belgique Dernières Nouvelles, Belgique Actualités
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