Since the accident at the Fukushima Daiichi Nuclear Power Plant following the terrible East Japan Earthquake in March last year, radiation has unfortunately been a topic of concern for everyone in Japan. It is therefore not surprising that a team of scientists at Tokyo University, where some of the top minds of Japan can be found, conducted a study on how radiation in seafood can be reduced. However, the results which have been reported in the media recently are not what you may expect from Japan’s premier academic institution.
According to reports, the team at Tokyo University, headed by Professor Shugo Watabe, concluded from their experiments that up to 95% of the radioactive cesium contained in fish can be removed by reducing the fish into very small pieces, close to paste form, and washing it repeatedly with water.
In the experiments, they used drumfish and pacific cod caught off the coast of Fukushima Prefecture during August and September of last year. The drumfish in particular contained 334 becquerels of cesium 134 and 137 per kilogram, but after processing the fish meat in a blender and then soaking and washing it with water three times, the cesium content decreased to 18.1 becquerels, just 5% of the initial amount. Even without using a blender, the cesium content was reduced to approximately one fifth of the original amount. Experiments with the pacific cod also showed that the cesium content decreased by about two thirds after washing once and was further reduced by each repeated washing.
Well, I don’t know about you, but the whole process of chopping fish into small pieces and washing it sounds quite unappealing, and would seem to defeat the purpose of eating seafood. I mean, what are we supposed to do if we want to have some nice fresh sashimi or grilled fish?
Japanese internet users also have not been too impressed with the results of this study and have been posting sarcastic comments such as: “Geez, they really are geniuses at Tokyo University. Ordinary people would never think of something like this,” or “Well, it can always be used as animal feed.” Other people have commented, “Are we supposed to eat only kamaboko fish cake?”, “Isn’t it just as dangerous to wash the cesium down the drain?”, “Does anybody care about taste and flavor?”, “Is this what research funding is being used on at Tokyo University?”
In any case, it’s highly unlikely that eating washed out fish paste will become common practice in Japan. Let’s hope someone comes up with a more appetizing way of removing radiation from seafood.
Source: Jiji.com website (Japanese) via Himajin Sokuho website (Japanese)

Fukushima Prefecture Produces First Thesis on the Effects of Internal Radiation Exposure: Children of Fukushima Unaffected?
More than two years on, many in Japan still uncertain about food from around Fukushima
Mr. Sato takes a walk on Tokyo’s American-style street to get some American/Japanese ice cream
The Japan Burger Championship 2026 in Yokohama next month is the ultimate battle of the beef
Japan’s real-world Pokémon hot spring’s first photos are here![Photos]
Sushi Pizza surprises diners in one of the best food destinations in Japan
Same name tops lists of most popular dog and cat names in Japan, and there’s probably a reason why
Tokyo’s insane Garlic Ramen is a meal, and an aroma, you’ll never forget[Taste test]
133-year-old Japanese company’s cookies go beyond matcha with dashi and shichimi flavors
Tokyo restaurant offers lunches for less than 1 U.S. cent…if you’re good enough at rock-paper-scissors
Two new Sailor Moon art manhole covers are coming to Usagi’s real-world Tokyo neighborhood
Krispy Kreme releases new limited-edition fox doughnuts at only four stores in Japan
Tokyo’s new extra-expensive ramen restaurant is dividing opinions, so we tried a bowl
Gundam teams up with 300-year-old daruma maker for wood-carved anime mecha figures[Photos]
Japanese temple burns to the ground, fire burning inside for 1,200 years unharmed
Japan’s instant ramen snack theme park features an athletic course even adults can enjoy
Krispy Kreme Japan is bringing two special donuts to the most-forgotten big city in the country
Pizza Hut Japan’s drinkable curry pizza is here – Is it all we dreamed it would be?[Taste test]
Japan’s izakaya pubs closing at record pace, failing to attract foreign tourists
Tokyo’s life-size Gundam anime mecha statue will be removed this summer
The average age of Japan’s hikikomori shut-ins is getting older, survey shows
Japan enters Golden Week vacation period, survey shows one in three plan to ride it out at home
Ichiraku Ramen-inspired ramen sets from Naruto anime pay homage to Naruto, Sasuke, and Sakura
Kanji ice cream becomes a sell-out hit in Japan
Japan’s new Pokémon jackets give you the look and powers of the Kanto starter trio
Japan now has gyoza doughnuts, and they taste like no other doughnut we’ve tried before
Studio Ghibli releases new anime keychains that are like miniature figurines
Japan has a new cute and clever sunblock for cat lovers
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
We deeply regret going into this tunnel on our walk in the mountains of Japan
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
Japan reportedly adding Japanese language skill requirement to most common foreigner work visa
Japan’s 5.3 million beautiful Hitachi Nemophila flowers are now in full bloom[Photos]