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Fears about contaminated seafood spread Wednesday despite reassurances that radiation in the waters off Japan's troubled atomic plant pose no health risk, as the country's respected emperor consoled evacuees from the tsunami and nuclear emergency zone.

While experts say radioactive particles are unlikely to build up significantly in fish, the seafood concerns in the country that gave the world sushi are yet another blemish for Brand Japan. It has already been hit by contamination of milk, vegetables and water, plus shortages of auto and tech parts after a massive quake and tsunami disabled a coastal nuclear power plant.

Setbacks at the Fukushima Dai-ichi nuclear complex mounted Wednesday, as the plant's operator, Tokyo Power Electric Co., announced that its president was hospitalized. Masataka Shimizu has not been seen since a news conference two days after the March 11 quake that spawned the destructive wave. His absence fueled speculation that he had suffered a breakdown.

Spokesman Naoki Tsunoda said Shimizu, 66, was admitted to a Tokyo hospital Tuesday after suffering dizziness and high blood pressure.

The problems at the nuclear plant have taken center stage, but the tsunami also created another disaster: Hundreds of thousands of people were forced from their homes after the wave drove miles (kilometers) inland, decimating whole towns. The official death toll stood at 11,362 late Wednesday, with the final toll likely surpassing 18,000.

Japan's respected Emperor Akihito and Empress Michiko visited disaster evacuees at a center in Tokyo on Wednesday. The visit was marked by a formality that is typical of interactions with the royal couple, but survivors said they were encouraged.

"I couldn't talk with them very well because I was nervous, but I felt that they were really concerned about us," said Kenji Ukito, an evacuee from a region near the plant who has already moved four times since the quake. "I was very grateful."

The emperor and his wife make fairly frequent public appearances, visiting nursing homes and the disabled and attending ceremonies throughout the year. In particular, they are expected to mourn with those affected by natural disasters. Akihito made a similar visit to evacuees after the Kobe earthquake in 1995.

At the Fukushima plant, the fight to cool the reactors and stem their release of radiation has become more complicated in recent days since the discovery that radioactive water is pooling in the plant, restricting the areas in which crews can work. It also puts emergency crews in the uncomfortable position of having to pump in more water to continue cooling the reactor while simultaneously pumping out contaminated water.

That contamination has also begun to seep into the sea, and tests Wednesday showed that waters 300 yards (meters) outside the plant contained 3,355 times the legal limit for the amount of radioactive iodine.

It's the highest rate yet, but Nuclear and Industrial Safety Agency official Hidehiko Nishiyama said it did not pose any threat to human health because the iodine rarely stays in fish. There is no fishing in the area because it is within the evacuation zone around the plant.

Radioactive iodine is short-lived, with a half-life of just eight days, and in any case was expected to dissipate quickly in the vast Pacific Ocean. It does not tend to accumulate in shellfish.

Other radioactive particles have been detected in the waters near the plant, and some have made their way into fish. Trace amounts of radioactive cesium-137 have been found in anchovies as far afield as Chiba, near Tokyo, but at less than 1 percent of acceptable levels.

"We have repeatedly told consumers that it is perfectly safe to eat fish," said Shoichi Takayama, an official with Japan's fishery agency.

Citing dilution in the ocean, the U.S. Food and Drug Administration has played down the risks of seafood contamination.

But, as with other reports of radiation levels in food and tap water, fear has begun to override science. Several countries, including China, India and South Korea, have ordered special inspections for or outright bans on fish from areas near the plant.

Ren Cheng, a spokesman for Taiwan's Mitsui Food & Beverage Enterprise Group that operates several upscale Japanese restaurants in Taipei, said his company has seen a 50 percent drop in revenue since the crisis began.

"We are not importing any food products from Japan. All the Japanese ingredients we are using were all procured before the quake," he said. "We have put up signs in our restaurants to reassure costumers about the safety of our food."

Domestic consumption, however, is far more important to Japan, which imports far more seafood than it exports. According to the fisheries agency, the domestic catch typically totals around 5.5 million tons. Less than a million of that gets exported, while another nearly 3 million tons are imported.

In stores near Tokyo's famed Tsukiji fish market, fresh fish was selling poorly.

Instead, customers "are stockpiling" frozen fish, in the hopes it was caught before radiation began to climb, said Hideo Otsubo, who works at a seafood company near the market.

Tourism to Japan has fallen sharply since the disaster, and sushi chef Akira Ogimoto blamed that dropoff for a 30 to 40 percent decline in customers to his restaurant near the market, where the daily tuna auction is a big draw for foreigners.

Add on the radiation fears, and fishermen are worried their livelihoods will be threatened just when they need to rebuild their homes.

"I worry we won't be able to sell our seaweed. If the radiation ruins our fishing, we are lost," said Toshiaki Kikuchi, a 63-year-old innkeeper and seaweed farmer in Soma, a city near the troubled plant.

Meanwhile, TEPCO's bungling response to the nuclear emergency has been severely criticized by the government and the press. The first few days after the quake saw fires and explosions and confusion has reigned throughout, and the company — whose shares have plunged nearly 80 percent — has frequently retracted or corrected information.

There has also been criticism that safeguards were lax at the Fukushima plant. The nuclear agency ordered plant operators nationwide on Wednesday to review their emergency procedures. The agency told utilities they must have on hand mobile backup generators and fire engines, which have been used at Fukushima to cool the reactors. The operators must report back to the agency within a month.

TEPCO chairman Tsunehisa Katsumata apologized at a news conference for the company's missteps. He has stepped in for the hospitalized president, but fears of a leadership vacuum remained. And Katsumata himself acknowledged that operations could deteriorate if Shimizu were hospitalized for a long time.

"In case of a long absence, it seems to me decisions might not be made smoothly," Katsumata told reporters.

The company also acknowledged for the first time it would have to completely scrap at least four of the plant's reactors — a fate experts and the government had already condemned them to.

The missteps at TEPCO have sparked calls from the opposition for its nationalization, and the Yominuri Shimbun newspaper, citing anonymous sources, said the government was considering it. But Chief Cabinet Secretary Yukio Edano denied those reports.

"My understanding is that the government is not considering such an option at this moment," Edano said Tuesday. He was more circumspect when asked again Wednesday, but reiterated that the company must work to resolve the crisis and compensate victims.

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Associated Press writers Eric Talmadge in Fukushima, Noriko Kitano and Elaine Kurtenbach in Tokyo, Margie Mason in Hanoi, Vietnam, and Malcolm Ritter in New York contributed to this report.