Japan's industry minister has disclosed plans for a meeting to decide on Tuesday exactly when to release treated and diluted water from the crippled Fukushima Daiichi nuclear power plant into the ocean.

Nishimura Yasutoshi and Prime Minister Kishida Fumio met senior officials of the Japanese fishing industry on Monday. They looked for understanding for the government's plan to release the treated water.

After the meeting, Nishimura told reporters that the head of the National Federation of Fisheries Co-operative Associations said his understanding about safety has deepened through the government's explanations and a report compiled by the International Atomic Energy Agency.

He also said the president requested the state to take full responsibility for coming up with the necessary measures over a period of decades to ensure that later generations can engage in the fishing industry.

Nishimura added that officials of the Fukushima Prefectural Federation of Fisheries Co-operative Associations assured the government that they understand that the plant will be safely decommissioned, and that they can continue to fish in nearby waters.

He said this will show that the government can keep its promises.

Nishimura said the government takes into account the exchange of opinions made on Monday, and judged that it has gained the understanding of those involved.

He disclosed plans for a meeting of relevant Cabinet ministers on Tuesday to decide on the timing for the release of the water after confirming its safety and how to counter misinformation.

Rain and groundwater mixes with water used to cool molten fuel at the plant. The accumulated water is treated to remove most radioactive substances, but still contains tritium.

The Japanese government plans to dilute the treated water to reduce tritium levels to about one-seventh of the World Health Organization's guidelines for drinking water quality before releasing it into the sea.