Biological concentration is catching up.
The Ministry of Health, Labor and Welfare conducted radiation measurement of wild animals in Fukushima ,such as boar, bear etc..
This measurement was started from 10/3/2011.
They took 40 samples of boar. The result shows they were extremely irradiated.
Bear was also highly irradiated.
Sample from Nihonmatsushi ;６７６Bq/kg
Sample from Fukushimashi ; ６４０Bq/kg
Other animals
Common pheasant ; ４０２Bq/kg ~ ND
Duck ; １６５Bq/kg ~ ND
Japanese deer ; ４６４Bq/kg ( They took only one sample but the only one sample was irradiated.)
(Source)