(A) negotiations as soon as possible with all foreign governments which are engaged in, or which have persons or companies engaged in, commercial fishing operations which are found by the Secretary to be unduly harmful to any species or population stock of marine mammal, for the purpose of entering into bilateral and multilateral treaties with such countries to protect marine mammals, with the Secretary of State to prepare a draft agenda relating to this matter for discussion at appropriate international meetings and forums;

(B) discussions with foreign governments whose vessels harvest yellowfin tuna with purse seines in the eastern tropical Pacific Ocean, for the purpose of concluding, through the Inter-American Tropical Tuna Commission or such other bilateral or multilateral institutions as may be appropriate, international arrangements for the conservation of marine mammals taken incidentally in the course of harvesting such tuna, which should include provisions for

(C) negotiations to revise the Convention for the Establishment of an Inter-American Tropical Tuna Commission (1 U.S.T. 230; TIAS 2044) which will incorporate

(D) discussions with those countries participating, or likely to participate, in the International Dolphin Conservation Program, for the purpose of identifying sources of funds needed for research and other measures promoting effective protection of dolphins, other marine species, and the marine ecosystem;

(A)  the negotiation of a binding international convention for the protection and conservation of all marine mammals, and

(B)  the implementation of paragraph (3) of this section; and

(A) in consultation with the Marine Mammal Commission established by section 1401 of this title, undertake a study of the North Pacific fur seals to determine whether herds of such seals subject to the jurisdiction of the United States are presently at their optimum sustainable population and what population trends are evident; and

(B) in consultation with the Secretary of State, promptly undertake a comprehensive study of the provisions of this chapter, as they relate to North Pacific fur seals, and the provisions of the North Pacific Fur Seal Convention signed on February 9, 1957, as extended (hereafter referred to in this subsection as the Convention), to determine what modifications, if any, should be made to the provisions of the Convention, or of this chapter, or both, to make the Convention and this chapter consistent with each other.

(A) as a result of the study required under paragraph (1)(A) of this subsection, that the North Pacific fur seal herds are below their optimum sustainable population and are not trending upward toward such level, or have reached their optimum sustainable population but are commencing a downward trend, and believes the herds to be in danger of depletion; or

(B) as a result of the study required under paragraph (1)(B) of this subsection, that modifications of the Convention are desirable to make it and this chapter consistent;

(i)  reduce or halt the taking of seals to the extent required to assure that such herds attain and remain at their optimum sustainable population, or

(ii)  make the Convention and this chapter consistent; or both, as the case may be. If negotiations to so modify the Convention are unsuccessful, the Secretary shall, through the Secretary of State, take such steps as may be necessary to continue the existing Convention beyond its present termination date so as to continue to protect and conserve the North Pacific fur seals and to prevent a return to pelagic sealing.