I should probably state the facts, so you all don't freak out on me.
There is no data that I can find defining levels of Methylmercury in Striped Bass. The FDA lumps together all saltwater bass, all sizes.
It is my PESONAL belief that large stripers contian higher amounts of methyl mercury due to bioaccumulation than I would want my young child or his nursing mother to consume.
http://vm.cfsan.fda.gov/~frf/sea-mehg.html