From the radiation measurement test of Ministry of Health, Labour and Welfare on 8/1/2012,
cesium134/137 was measured from 60% of the fishery products. (80 of 132 products.)
They are not distributed to the markets supposedly.
15% of them exceeded even Japanese safety limit of 100 Bq/kg.
The highest reading was 640 Bq/Kg from common skete, fished offshore Iwaki city.
Sample taken : 7/30/2012
Cs134 : 243 Bq/Kg
Cs137 : 398 Bq/Kg
According to Ordinance of the Ministry of Economy, Trade and Industry No.112 [Link], radioactive material to contain more than 100 Bq/kg of Cs-134/137 must be properly stocked to not to cause public radiation hazard.
When you see this 398 Bq/Kg of Cs-137, the contamination level of this product is almost 3 times higher than the safety limit. This is fishery nuclear waste.
(cf. [Sea contamination] Cesium in Pacific cod is increasing offshore Hokkaido [Link])