On a floured work surface, roll out the dough discs, one at a time, to a 1-mm (1/16-inch) thick sheet. Prick the dough with a fork to prevent them from puffing. Cut out crackers with a 2.5-cm (1-inch) cookie cutter in the shape of a fish (or other shapes). Place on the baking sheet without spacing them too much. Sprinkle with salt. Bake for 8 to 10 minutes depending on their size or until lightly browned. Repeat with the remaining dough. Store at room temperature.