100 Bq/Kg of cesium was measured from largemouth bass on 5/26/2012.
The bass was taken from Ashinoko lake (300km from Fukushima plant) in west Kanagawa. Kanagawa prefectural government assumes it was because of biological concentration.
There is Sagamiko lake at 40 km north east to Ashinoko lake. This is the headwater area of Yokohama and Kawasaki. Because it is closer to Fukushima, tap water of Yokohama and Kawasaki is likely to be contaminated as well.
↓ Sagamiko lake, the headwater area of Yokohama, Kawasaki
↓ Ashinoko lake