shaking standard

Before 311 the standard set by governemnt was less than 1 Bq, as a matter of fact if caesium were detected it was something like 0.005 etc..then after the incident the criterion rises to 500 Bq, but as of April 1, now that is 100 Bq.
I have stopped eating fish caught off the pacific ocean and I started choosing salmon from Argentina, Norway. We have imported fish from USA, too.  I must take into consideration the fact above.