| If clam growth is no longer an issue during the pre-growth phase in the Bourgneuf bay region, the two year growth phase shows several problems: in the south bay area, the growth of Ruditapes phi¿lippinarum clams is inconsistent and depends on oyster and mussel stocks. In fattening ponds raising standards only allow a 500g/m final biomass. This forces clam farmers to own large areas, which are currently hardly available in this region. The alternative would consist in fractioning the growth phase into two steps: half raising in tidal zones (half buried pots at 2000/ra) or in fattening ponds, under extensive conditions (200/m) or intensive (1000/m) by adding phytoplankton. Winter stocking, for all cases in fattening ponds, would prevent major stress in... |
