NHK World skriver:

Seawater's radiation levels remain high
Citat:
Tokyo Electric Power Company says the level of radioactive iodine-131 found 330 meters south of a water outlet of the plant's No. 1 to No 4 reactors was 4,385 times the legal limit on Wednesday last week.
The level has since been declining. Iodine-131 measured in the same area on Sunday was 630 times the limit.
The radioactive material measured 30 meters north of the outlet of the No. 5 and No. 6 reactors was 240 times the national limit, compared with 3,000 times the limit recorded last Friday.
http://www3.nhk.or.jp/daily/english/04_31.html
Värdena har fallit, men dom är fortfarande höga.
Man har också funnit radioaktivitet i fisk:
Citat:
In a related story, the health ministry says 4,080 bequerels of radioactive iodine was detected in one kilogram of sand lances, a kind of fish, caught in waters off Ibaraki Prefecture, south of the troubled plant.