The radioactive fish was caught near drainage outlets at the TEPCO plant, where three nuclear reactors melted down amidst a tsunami in March 2011. Rainwater from areas near the reactors flows into the area where the fish was caught.
The alarming discovery reignited concerns over TEPCO's plans to start releasing 1.3 million tons of treated wastewater from the former Fukushima Daiichi nuclear power plant by August.
A report from July 23 showed that the problem is still unaddressed, prompting questions about how dangerous the company's plans are for the public.
Radioactive cesium has been detected in surface water and different kinds of food, such as breast milk and pasteurized milk. The amount of radioactive cesium in food and milk depends on several factors.
The most important factor is whether or not there has been a recent fallout from a nuclear explosion, like a weapons test or an accident at a nuclear power plant.
Depending on one's level of exposure, cesium can cause diarrhea, bleeding, nausea, vomiting, coma and death.
TEPCO wastewater has been mixed with rainwater and groundwater since the tsunami. The company admitted that fish near the drainage outlets are unsafe for consumption because the concentration of cesium in seabed sediment in the area has measured more than 100,000 becquerels per kilogram (Bq/kg). The maximum legal level is only 100 Bq/kg.
A TEPCO official explained that the company has regularly removed fish from inside the port since 2012 because contaminated water flowed into the Fukushima Daiichi nuclear power station port immediately after the accident.
In January 2022, a fish caught near Fukushima was found to have high levels of radiation. Authorities said that the fish had escaped from the drainage outlet.
Following the report, shipments of black rockfish caught off the coast of Fukushima prefecture were immediately suspended. As of writing, they have not been resumed.
More than 40 fish with cesium levels over the legal limit were caught in TEPCO's port between May 2022 and May 2023. At least 90 percent of the fish were from the inner breakwater, where water flows from the area surrounding the melted TEPCO reactors.
The Nuclear Regulation Authority (NRA) in Japan and the United Nations' International Atomic Energy Agency (IAEA) have both approved TEPCO's plan to release wastewater into the Pacific Ocean. The company claims the move is necessary to "secure space for decommissioning the plant." (Related: Japan gets green light to release Fukushima radioactive water into Pacific Ocean.)
Meanwhile, officials in Hong Kong have declared that they will ban food imports from 10 prefectures in Japan if the release moves forward in August. Some Chinese wholesalers have already stopped accepting seafood imports from Japan.
Aside from concerns about cesium, TEPCO has admitted that ALPS, which it plans to use, may not be enough to eliminate isotopes such as cobalt, plutonium, ruthenium and strontium. The system is also unable to remove tritium, the radioactive isotope of hydrogen.
Cobalt 60 - an extremely dangerous isotope hence wormwood in the Pacific.
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