Sushi eating and the radiation from the Japanese earthquake

This morning I heard a caller ask an interesting to Melinda Lee, the local radio food person.
 
Her question to Melinda: Since the radioactive leakage from the nuclear reactors in Japan, are you eating sushi?
 
Melinda's answer was yes, twice that she can think of.
 
Now my questions:
 
Do you know where your fish was caught?
 
Would you be concerned if it was known that they were caught in Japanese waters?
 
I know that there was a question about seafood from the
Gulf after the oil platform disaster but radioactive seafood seems very different.
 
If your fish wasn't caught in Japanese waters, did they swim there a few weeks ago?
 
Does this matter?