TOKYO (Kyodo) -- An international conference in southwestern Japan on the sustainable management of Pacific bluefin tuna failed to agree on expanding the catch quota after Mexico unexpectedly opposed the move, Japan's Fisheries Agency said Tuesday.During the conference that began last Wednesday in Nagasaki, the Japanese government had hoped to agree on transitioning to new regulations that would automatically set quotas based on tuna stocks and increase the catch limit for fish weighing over 30 kilograms. Negotiations will continue."We were unable to reach an agreement because of the unreasonable actions of one country and we are feeling outraged," said Takumi Fukuda, councilor of Japan's Fisheries Agency.A bigger catch quota would have made bluefin tuna, currently considered a luxury fish, more affordable for consumers.If the participating members of the conference had agreed on a new rule, it would have been officially adopted at the annual meeting of the Western and Central Pacific Fisheries Commission beginning at the end of November and could have been applied as soon as 2027.The combined catch quotas currently stand at 11,869 tons for larger fish and 5,125 tons for smaller fish, of which Japan's quotas are 8,421 tons and 4,407 tons, respectively.With the bluefin tuna population steadily recovering, Japan has been hoping to expand its quota. But the countries were also unable to reach an agreement last year as the U.S. emphasized the need to conserve the resource.