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A nearly invisible oil spill threatens some of Asia’s richest fisheries


 A fiery collision that sank an Iranian tanker in the East China Sea a month ago has resulted in an environmental threat that experts say is unlike any before: an almost invisible type of petroleum has begun to contaminate some of the most important fishing grounds in Asia, from China to Japan and beyond.

It is the largest oil spill in decades, but the disaster has unfolded outside the glare of international attention that big spills have previously attracted. That is because of its remote location on the high seas and also the type of petroleum involved: condensate, a toxic, liquid byproduct of natural gas production.

Unlike the crude oil in disasters like the Exxon Valdez and the Deepwater Horizon, condensate does not clump into black globules that can be easily spotted or produce heart-wrenching images of animals mired in muck. There’s no visible slick that can be pumped out. Experts say the only real solution is to let it evaporate or dissolve. Absorbed into the water, it will remain toxic for a time, though it will also disperse more quickly into the ocean than crude oil.

Up to 111,000 metric tons of condensate has poured into the ocean. It has almost certainly already invaded an ecosystem that includes some of the world’s most bountiful fisheries off Zhoushan, the archipelago that rises where the Yangtze River flows into the East China Sea.

The area produced 5 million tons of seafood of up to four dozen species for China last year, according to Greenpeace, including crab, squid, yellow croaker, mackerel and a local favorite, hairtail. If projections are correct, the toxins could soon make their way into equally abundant Japanese fisheries.

Exposure to condensate is extremely unhealthy to humans and potentially fatal. The effects of eating fish contaminated with it remain essentially untested, but experts strongly advise against doing so.

For China, the disaster has become a test of its ambitions as a global and regional steward of the seas. Given its proximity, China has taken the lead in investigating the disaster and monitoring the spill, but it has faced some criticism for what some see as a slow and inadequate response thus far.


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