In 1991 leggen de mosseltelers, verenigd in PO's (Producentenorganisaties), zichzelf vrijwillig vangstbeperkingen (quota's) op en beloven ze het zaad met de vogels te zullen delen. ###>In 1991, mussel farmers, meeting in their POs (producer's organisations), established voluntary catch limits (quotas) and measures for sharing the spat with the birds.