Revises specified Acts regarding one or more of the following: (1) enforcement of those Acts under this Act; (2) false labeling or identification of fish or fish products; (3) refusing, resisting, or interfering with various enforcement activities; (4) civil or criminal penalties or forfeiture; (5) unlawful activities; and (6) a rule to implement conservation measures.

Amends the High Seas Driftnet Fishing Moratorium Protection Act to take a variety of steps regarding illegal, unreported, or unregulated fishing (IUUF) or bycatch of a protected living marine resource.

Requires, subject to appropriations, establishment of an International Fisheries Enforcement Program in the Office of Law Enforcement of the National Marine Fisheries Service to detect and investigate IUUF and to enforce this Act. Requires, on request, that the intelligence community collect information on IUUF outside the United States about individuals who are not United States persons.

Authorizes establishment of an international cooperation and assistance program, including grants, to support international capacity building.

Amends the High Seas Driftnet Fishing Moratorium Protection Act to authorize information disclosure to the Food and Agriculture Organization of the United Nations, international fishery management organizations, or arrangements made under an international fishery agreement.

Amends the High Seas Fishing Compliance Act to remove a provision making a high seas fishing permit valid for five years and to modify conditions that void a permit.

Provides for enforcement as though specified prohibited acts and enforcement provisions of the Magnuson-Stevens Fishery Conservation and Management Act had been incorporated into each of those Acts. Sets civil and criminal penalties (including criminal forfeiture) for violations and sets forth search, inspection, shipment detention, arrest, and subpoena authorities.

Makes certain acts unlawful, including regarding: (1) refusing, resisting, or interfering with searches, investigations, inspections, or observers; (2) importing, exporting, transporting, selling, or purchasing fish or fish products in violation of a treaty or any binding conservation measure to which the United States is a party; or (3) falsifying records, accounts, labels, or product identification.

(Sec. 103) Amends the High Seas Driftnet Fishing Moratorium Protection Act to authorize the Secretary of Commerce to: (1) develop, maintain, and make public a list of vessels and vessel owners engaged in illegal, unreported, or unregulated fishing (IUU), including vessels or vessel owners identified by an international fishery management organization; and (2) take appropriate action against listed vessels and vessel owners in accordance with U.S. and international law, including principles, rights, and obligations under international fishery management and trade agreements. Requires that action taken that includes restricting the use of or access to ports or port services apply to all ports of the United States and its territories.

Authorizes the Secretary of the Treasury, in accordance with international law, to withhold or revoke clearance and to deny entry of a vessel engaged in IUU to any U.S. place and to U.S. navigable waters. Prohibits the importation of fish and fish products and sport fishing equipment if the Secretary of Commerce certifies that a nation has not taken appropriate corrective action regarding IUU.

Allows the President to prohibit the importation of any products from the offending country, to the extent that the prohibition is sanctioned by the World Trade Organization or multilateral trade agreements, if the Secretary of Commerce determines that the prohibition on the importation of fish and fish products and sport fishing equipment is insufficient to cause that nation to address bycatch of a protected living marine resource.

Title II: Law Enforcement and International Operations - (Sec. 201) Requires, subject to appropriations, establishment of an interagency International Fisheries Enforcement Program in the Office of Law Enforcement of the National Marine Fisheries Service to detect and investigate IUU and to enforce this Act. Requires, on request, that the intelligence community collect information on IUU outside the United States about individuals who are not United States persons. Authorizes sharing fisheries-related data with federal, state, and foreign governments and international organizations, including international fishery management organizations. Authorizes appropriations.

(Sec. 202) Authorizes establishment of an international cooperation and assistance program, including grants, to support international capacity building. Includes in authorized activities providing to other nations: (1) funding and technical expertise to assist them in addressing illegal, unreported, or unregulated fishing activities; (2) funding and technical expertise to assist them in reducing the loss and environmental impacts of derelict fishing gear, reducing the bycatch of living marine resources, and promoting international marine resource conservation; and (3) funding, technical expertise, and training to aid them in building capacity for enhanced fisheries management, fisheries monitoring, catch and trade tracking activities, enforcement, and international marine resource conservation. Authorizes appropriations.

Title III: Miscellaneous Amendments - (Sec. 302) Amends the High Seas Driftnet Fishing Moratorium Protection Act to direct the Secretary of Commerce to seek and foster the sharing of accurate, relevant, and timely information to: (1) improve scientific understanding, improve fisheries management, and improve compliance with conservation and management measures in international waters; (2) promote the conservation of protected living marine resources; and (3) combat IUU.

Authorizes information disclosure to the Food and Agriculture Organization of the United Nations, international fishery management organizations, or arrangements made under an international fishery agreement, if those organizations or arrangements have policies and procedures to safeguard the information from unintended or unauthorized disclosure.

(Sec. 303) Amends the High Seas Fishing Compliance Act to rewrite the provision that makes a high seas fishing permit valid for five years and to instead provide that a permit is voided if either one or more permits required for a vessel to fish expire, are revoked, or suspended, or the vessel is no longer eligible for U.S. documentation.

(Sec. 306) Amends the Pacific Salmon Treaty Act of 1985 to fix the compensation of the members of the Committee on Scientific Cooperation who are not state or federal employees.

(Sec. 307) Amends the Marine Mammal Protection Act to authorize appropriations to conduct a study of the effect of intentional encirclement (including chase) on dolphins and dolphin stocks incidentally taken in the course of purse seine fishing for yellowfin tuna in the eastern tropical Pacific Ocean.

Amends the Pacific Salmon Treaty Act of 1985 to authorize appropriations to the states of Alaska, Washington, Oregon, Idaho, and California for salmon habitat restoration, salmon stock enhancement, sustainable salmon fisheries, and salmon research, including the construction of salmon research and related facilities.

Amends the South Pacific Tuna Act of 1988 to authorize appropriations to carry out the Act and the Treaty on Fisheries Between the Governments of Certain Pacific Island States and the Government of the United States of America and its annexes, schedules, and implementing agreements.

Title IV: Implementation of the Antigua Convention - Antigua Convention Implementing Act of 2008 - (Sec. 404) Amends the Tuna Conventions Act of 1950 to modify or establish requirements regarding: (1) the number, appointment, and qualifications of commissioners of the Inter-American Tropical Tuna Commission; (2) the appointment, number, and compensation of the General Advisory Committee; and (3) the appointment and number of the Scientific Advisory Subcommittee.

(Sec. 406) Authorizes the Secretary: (1) to promulgate regulations to carry out U.S. international obligations under the Convention and the Tuna Conventions Act of 1950, including recommendations and decisions adopted by the Commission; (2) where the Secretary has discretion in the implementation of one or more measures adopted by the Commission and to the extent practicable within the Convention's implementation schedule, to promulgate such regulations in accordance with the procedures established by the Magnuson-Stevens Fishery Conservation and Management Act; and (3) to promulgate regulations applicable to all vessels and persons subject to the jurisdiction of the United States, including U.S. flag vessels wherever they may be operating, on whatever date the Secretary prescribes. (Among other things, current law that would be replaced by this amendment: (1) authorizes the Secretary of State to approve or disapprove of bylaws and rules adopted by each commission and submitted for U.S. approval; and (2) requires that regulations recommended by the Inter-American Tropical Tuna Commission or the International Commission for the Scientific Investigation of Tuna, if approved by the Secretaries of State and Commerce, be promulgated and applicable to all vessels and persons subject to U.S. jurisdiction.)

(Sec. 407) Revises the list of prohibited acts under the Tuna Conventions Act of 1950.

(Sec. 408) Requires that the Tuna Conventions Act of 1950 be enforced under this Act.

(Sec. 410) Repeals the Eastern Pacific Tuna Licensing Act of 1984.