Following up this article..Plutonium measured from marine products fished offshore Fukushima
Having measured cesium and plutonium from various kinds of fish, Fukushima prefecture released 100,000 fry of flounders to offshore of Soma on 7/10 and 12, where is only 43 km from Fukushima plant.
Sea-bottom fauna is known to concentrate radiation such as flounder.
Currently the fry is 6cm, but when they grow to be over 30cm next year, they will be landed to sell.
The fry was bred in Niigata. They are breeding abalone in Shizuoka to release in Fukushima next Summer as well.