If mercury and farm fish with PCBs float your boat then its an aphrodisiac. Not for me.
You omitted (involuntarily I assume) the generous helpings of cuprous oxide and antibiotics that comes with the orders of farmed fish.
Mercury is mostly found in large fish like blue fin tuna (exported to Japan) or other large meat animals. Regular small tuna like albacore, yellow fin and bonita have very little mercury - if any, despite the scare studies funded by envirowackos.