Put salmon fillet and bay leaf in a large saucepan. Pour stock over and add some milk, if needed, to cover fish with liquid. Slowly bring to boil over medium heat. Reduce heat, cover, and simmer 6 minutes or until fish flakes easily. Remove salmon with slotted spoon, break into large flakes, discard any bones, and set meat aside. Pour cooking liquid (with bay leaf) into a measuring jug or large bowl and reserve.