That's the maximum amount of toxins we can consume without any major side effects. However, at levels higher than this (obviously varies across different people) side effects can occur, such as excessive fatigue or lethargy or maybe development issues in children who are still growing. however, these chemicals do not kill instantly so fish can swim around for quite a long period of time without dying but is probably ill in some way. also with some toxins, it will probably pass through the fish's system but with heavy metals such as lead, it will stay in the fish's (and also YOURS) body indefinitely. and also they have rules east/west of the bridge because they have to have a definite boundary where their recommendations exist but fish from that has lived at the west side of the bridge for its whole life can easily swim into the east side. so personally i would refrain from eating any fish in that region because i dont think it is worth it. The potential complications that could arise in the future far outweigh the enjoyment you get from eating your catch. But i digress, at the end of the day i guess its all up to you and no one can tell you what to do. hahaha Peace guys.