It is understood that the above-mentioned liberty applies solely to the sea fishery; and that salmon and shad fisheries, and all other fisheries in rivers and mouths of rivers, are hereby reserved exclusively for fishermen of the United States. ARTICLE XX. It is agreed that the places designated by the commissioners appointed under the first article of the treaty between the United States and Great Britain concluded at Washington on the 5th of June, 1854, upon the coasts of Her Britannic Majesty's dominions and the United States, as places reserved from the common right of fishing under that treaty, shall be regarded as in like manner reserved from the common right of fishing under the preceding articles. In case any question should arise between the Governments of the United States and of Her Britannic Majesty as to the common right of fishing in places not thus designated as reserved, it is agreed that a commission shall be appointed to designate such places, and shall be constituted in the same manner and have the same powers, duties, and authority as the commission appointed under the said first article of the treaty of the 5th of June, 1854. ARTICLE XXI. It is agreed that for the term of years mentioned in Article XXXIII of this treaty fish oil and fish of all kinds (except fish of the inland lakes and of the rivers falling into them, and except fish preserved in oil), being the produce of the fisheries of the United States, or of the Dominion of Canada, or of Prince Edwards Island, shall be admitted into each country, respectively, free of duty. ARTICLE XXII. Inasmuch as it is asserted by the Government of Her Britannic Majesty that the privileges accorded to the citizens of the United States under Article XVIII of this treaty are of greater value than those accorded by Articles XIX and XXI of this treaty to the subjects of Her Britannic Majesty, and this assertion is not admitted by the Government of the United States, it is further agreed that commissioners shall be appointed to determine, having regard to the privileges accorded by the United States to the subjects of Her Britannic Majesty, as stated in Articles XIX and XXI of this treaty, the amount of any compensation which in their opinion ought to be paid by the Government of the United States to the Government of Her Britannic Majesty in return for the privileges accorded to the citizens of the United States under Article XVIII of this treaty; and that any sum of money which the said commissioners may so award shall be paid by the United States Government, in a gross sum, within twelve months after such award shall have been given. ARTICLE XXIII.