Between 1999 and 2010 changes in
seafood consumption meant that blood levels of mercury in women of childbearing age dropped by a third, and the percentage of such women who have worrisome blood levels of mercury dropped by two thirds.
This
means that not only can a legal level of domoic acid in any
seafood harm the kidneys, but your cat may also be eating fish that are condemned for human
consumption due to excessive domoic acid, which may be processed into pet food.