Nine patrol boats from the 10 member nations of the Forum Fisheries Agency took part in Operation Island Chief, with support from the navies of Australia, New Zealand and the United States.
More than 350 personnel were involved in the operation that covered 14 million square kilometres of ocean.
Four fishing vessels, three flagged to China and one to Chinese Taipei, were found to be infringing fishing regulations.
The infringements in Vanuatu and on the high seas, centred around misreporting of information and unmarked gear.
