The release of a third batch of treated radioactive wastewater from Japan’s damaged Fukushima nuclear plant into the Pacific Ocean ended safely as planned, its operator said Monday, as the country’s seafood producers continue to suffer from a Chinese import ban imposed after the discharges began.

Large amounts of radioactive wastewater have accumulated at the nuclear plant since it was damaged by a massive earthquake and tsunami in 2011. It began discharging treated and diluted wastewater into the ocean on Aug. 24 and finished releasing the third 7,800-ton batch on Monday. The process is expected to take decades.