VALPARAÍSO, Chile – Seafood offers a large amount of animal protein in diets around the world, and the livelihoods of 12 percent of the global population depend directly or indirectly on fisheries and aquaculture.

However, the impacts of climate change, plastic waste pollution, illegal fishing, and acidification threaten the oceans and their biodiversity, said experts at the second international Our Ocean conference, held Oct. 5-6 in the Chilean port of Valparaíso, 120 km northwest of Santiago.

The more than 500 participants from 56 countries taking part in the gathering committed to some 80 marine conservation and protection initiatives for over 2.1 billion dollars, covering more than 1.9 billion km of ocean, said Chile’s foreign minister, Heraldo Muñoz.

Muñoz and his U.S. counterpart, Secretary of State John Kerry, hosted the conference, whose first edition took place in 2014 in Washington, D.C.

In one of the keynote speeches, the director general of the United Nations Food and Agriculture Organisation (FAO), José Graziano da Silva, said keeping the oceans healthy and productive was key to eradicating hunger and reaching the 2030 Agenda for Sustainable Development adopted by the international community during a Sept. 25-27 U.N. summit in New York.

“We cannot continue to use water resources as if they were infinite,” said Graziano da Silva, who pointed out that nearly one-third of the world’s fish stocks are overfished.

The U.N. official said oceans do not have an infinite capacity to withstand the threats they face: over-exploitation of marine resources, climate change, pollution and loss of habitat.

“The health of our own planet and our food security depends on how we treat the blue world,” he stated.

FAO emphasises that fish is a highly nutritious complement to diets lacking in essential vitamins and minerals.

According to FAO, about one billion people – largely in developing countries – rely on fish as their primary source of animal protein. And in 2010, “fish provided more than 2.9 billion people with almost 20 percent of their intake of animal protein, and 4.3 billion people with about 15 percent of such protein.”

And in some countries, especially small island states, fish accounts for over 25 percent of animal protein intake, the U.N. agency reports.

Besides offering a staple element in diets worldwide, fishing and aquaculture provide jobs and incomes to millions of people across the planet.

“Fishing is part of the oldest, most remote history of the American continent,” social anthropologist Juan Carlos Skewes told IPS. “In the interior of the continent as well as along the coasts and rivers it provided sustenance for dozens of native peoples, especially groups whose nomadic way of life depended on the sea.”

And that is still true: 12 percent of the global population – or 875,000,000 people – depend directly or indirectly on fishing and aquaculture.