I am at the office, I can look when I get home. It listed the effects on liver, kidneys, renal failure, discoloration of blood, heart tissue, coloring of gills, and fins, etc. And as a side note, noted that prolonged exposure would lead to death, sterility, and should be avoided. Then it went on to list treatments and prevention. My problem is it didn't explain it, least ways not the above mentioned points, so I thought I would ask here. You yourself UF are mouch more educated on the 'how comes' and 'whys' of things so I figured this would be a good start. Hence the title of the thread was "biology question". As in I don't know. But I have been reading enough stuff to know, that just because it's printed or online doesn't mean it's true. I will find what your asking for this evening when I get in.