President Donald Trump's envoy to the conference, David Balton, said the ocean and its resources are "under tremendous pressure from a variety of threats - including illegal fishing, marine pollution, and ocean acidification."
"Illegal, unreported, and unregulated -- or IUU -- fishing around the world is jeopardizing international food security and economic growth, and threatening marine ecosystems," said Balton, the US deputy assistant secretary for oceans and fisheries.
The United States, the world's biggest carbon emitter after China, signed the agreement last year under the previous administration, but Trump has argued that the deal would harm the US economy.
UN Secretary General Antonio Guterres opened the conference with an appeal to countries to put aside national gain to save the oceans and avert a "global catastrophe."
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"Pollution, overfishing and the effects of climate change are severely damaging the health of our oceans," he asserted, singling out plastic pollution as particularly harmful.
At the UN podium, Balton said the United States "has championed" an agreement on combating illegal fishing under the auspices of the UN Food and Agriculture Organization.
Illegal fishing is valued at tens of billions of dollars each year and is often linked to drug trafficking, organized crime, workers' exploitation and environmental degradation, he said.
The United States is set to join a "Call to Action" to be released on the final day of the conference tomorrow, signed by governments that commit to taking steps to clean up the oceans.
While it will endorse the "Call to Action", the United States will take the podium again tomorrow to explain its position, US diplomats said.
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