Underwater canyons, deep-sea coral reefs and sponge banks are part of a unique ecosystem that South Africa wants to save within its first deep-sea marine protected area.

After 10 years of consultations, South Africa has mapped the boundaries for the proposed reserve stretching 100 km from the eastern KwaZulu-Natal coast.

The mapping required synthesizing the many divergent interests in the Indian Ocean waters, with 40 industries from fishing to gas lines to jet skis operating in an area home to about 200 animal species and their ecosystems.

"All of this data was then entered into conservation planning software in order to identify areas of high biodiversity while avoiding areas of high (economic) pressure," said Tamsyn Livingstone, the researcher who heads the project.

The conservation area is being born in a spirit of compromise, which will allow people and companies to continue using the protected waters in zones designated as lower-risk threats to biodiversity.

The scheme still needs to be passed into law but would join South Africa's existing network of marine preserves strung along its 3,000-km coast stretching from the warm Indian Ocean to the cold southern Atlantic.

South Africa has embraced this "participatory" method to protecting species living in its water, an approach pioneered in California and Australia.

Global goals for protecting biodiversity have been debated for two weeks at a UN summit in Nagoya, Japan, in an effort to set goals on saving habitats which would help to end the mass extinction of species.

Environmental groups want 20 percent of coastal and marine areas protected. Talks are supposed to wrap up on Friday.

Part of the challenge is in protecting species that are more often than not still unknown. Only one quarter of the estimated million species in the oceans have been discovered.

A global census of the oceans unveiled in early October uncovered prehistoric fish thought dead millions of years ago, capturing researchers' imaginations about what else lurks in the deepest parts of the sea.

"Offshore biodiversity is not well known," said Kerry Sink of the South African National Biodiversity Institute.

Exploring the seas remains an expensive project, prompting South African researchers to reach agreements to share information with fisheries, coastal diamond mines and the oil industry.

"South Africa's plan is unique in covering all industry sectors to ensure that biodiversity planning minimizes the impact on industry," she said.

"Healthy offshore ecosystems underpin healthy fisheries and keep options open for future generations."

With growing worries about climate change, scientists say the deep seas could become an important source of protein for the planet, because water temperature changes less at great depths.

That assumes that the growth of industry can be managed alongside the marine life, especially as oil companies find ways to drill in ever-deeper waters.