Commission Regulation (EC) No 1826/1999 of 23 August 1999 amending Regulation (EC) No 929/1999 imposing provisional anti-dumping and countervailing duties on imports of farmed Atlantic salmon originating in Norway with regard to certain exporters, imposing provisional anti-dumping and countervailing duties on imports of such salmon with regard to certain exporters, amending Decision 97/634/EC accepting undertakings offered in connection with the anti-dumping and anti-subsidies proceedings concerning imports of such salmon and amending Council Regulation (EC) No 772/1999 imposing definitive anti-dumping and countervailing duties on imports of such salmon