Japan's crippled Fukushima nuclear power plant said Friday it has scrapped a plan to dump water it treated for radiation contamination into the sea following fierce protests from fishing groups.

Tokyo Electric Power (Tepco), the utility operating Fukushima's Daiichi plant, had said Thursday it was considering discharging some treated water into the sea because it was running out of storage space.

That caused an uproar among Japanese fishing cooperatives.

Treated means once-high radioactive content has been reduced considerably, but not completely.

The Fukushima plant was struck by a devastating quake and tsunami in March and has released radiation into the atmosphere, carried by winds, rain and snow, ever since.

The decision not to include the plan was made after talks Thursday with the federation of fishing cooperatives and opposition from the government's Fisheries Agency, a Tepco spokeswoman said.

Tepco general manager Junichi Matsumoto told reporters on Friday that the company would try to build more tanks and recycle more of the treated water for cooling purposes.

Tens of thousands of tonnes of water contaminated with radiation have accumulated at the plant, 240 km (150 miles) northeast of Tokyo, after Tepco, early in the crisis, tried to cool reactors that suffered nuclear fuel meltdowns by pouring in water, much of it from the sea.

Tepco estimates that the amount of treated water requiring storage is increasing by 200 to 500 tonnes every day. It says the plant is likely to reach its storage capacity of about 155,000 tonnes around March.

The utility released more than 10,000 tonnes of water tainted with low levels of radiation in April to free up space for water with much higher levels of radioactivity, drawing sharp criticism from neighbors such as South Korea and China.

(Reporting by Shinichi Saoshiro; Editing by Chris Gallagher and Nick Macfie)