This compact shall become operative immediately as to those states ratifying it whenever any two or more of the states of Florida, Alabama, Mississippi, Louisiana and Texas have ratified it and the Congress has given its consent, pursuant to Article I, Section 10 of the Constitution of the United States. Any state contiguous to any of the aforementioned states or riparian upon waters which flow into waters under the jurisdiction of any of the aforementioned States and which are frequented by anadromous fish or marine species, may become a party hereto as hereinafter provided.