Figure 5

Accumulation patterns of radiocesium in freshwater fish species for three years. The highest concentration was found in masu salmon (18700 Bq kg^-1). The second highest concentration was found in ayu (2900-4400 Bq kg^-1), while the third highest concentration was found in Japanese dace (2500 Bq kg^-1). All of the fish were collected in the Sousou region between May 2011 and March 2012. Although each radiocesium isotope concentration decreased significantly in most of the freshwater fish species, the tendencies varied among the species.