54.—Where part of a river consists of special tidal waters and another part (being a part in which salmon spawn) of such river is situate in Northern Ireland, F56[Inland Fisheries Ireland] may, with the approval of the Minister, enter into such arrangements or agreements as it considers expedient for ensuring the protection of salmon and trout, and their eggs and fry in the part of such river which is situate in Northern Ireland and for the purpose of such arrangements or agreements make payments out of its funds.