Japan has conveyed its concerns to the Chinese government over possible import controls on Japanese seafood.

Officials in Beijing have suggested they could take the measure in light of Japan's plan to release treated and diluted water from the crippled Fukushima Daiichi nuclear power plant into the sea.

The Japanese side is working to emphasize the safety of Japanese seafood from a scientific viewpoint. But some products are currently being held up in China for unusually long customs inspections.

On Friday, Chief Cabinet Secretary Matsuno Hirokazu said blanket radiation screenings would go against the global trend of easing or lifting restrictions on Japanese foods.

Matsuno added that Japan has urged Beijing to properly deal with the situation through diplomatic channels.

The Fukushima nuclear plant suffered a triple meltdown in the March 2011 earthquake and tsunami.

Water used to cool molten nuclear fuel mixes with rain and groundwater. The accumulated water is treated to remove most radioactive substances, but tritium remains.

The Japanese government plans to dilute the water to reduce the level of tritium to about one-seventh of the World Health Organization's safety standard for drinking water.

The Japanese government says a report by the International Atomic Energy Agency shows that discharging the water into the ocean would be consistent with international safety standards.