N.H. Rev. Stat. § 211:4
If, in the case of a lake or pond situated partly in this state and partly in another state, the laws of such other state permit fishing in that part thereof lying within such other state by persons licensed or otherwise entitled under the laws of this state to fish in that part of such lake or pond lying within this state, persons licensed or otherwise entitled under the laws of such other state to fish in the part of such lake or pond lying within such other state shall be permitted to fish in that part thereof lying within this state, and, as to such lake or pond, the operation of the laws of this state relative to open and closed seasons, limits of catch, minimum sizes of fish caught and methods of fishing shall be suspended upon the adoption and during the continuance in force of rules and regulations relative to those subjects and affecting that part of such lake or pond lying within this state, which rules and regulations the executive director is hereby authorized to make, and from time to time add to, alter and repeal. Before making, adding to, altering or repealing such rules and regulations, said executive director shall confer with the officer or board having like duties in such other state, in order to secure uniformity of law, rules and regulations as to the whole of such lake or pond, if practicable. Such rules and regulations shall prior to their effective date be printed and available for distribution at the office of the executive director and of the clerk of each city and town in this state in which any part of such lake or pond is situated or to which it lies adjacent.
RSA 211:4
1949, 69:1, eff. Mar. 16, 1949.