Tilapia is the most disgusting fish!
I compare it to a rat or a cockroach. They can survive practically anywhere and on practically anything.
I've worked in a few boat harbors, where the water is quite polluted and those and only those fish seem to thrive on engine oil and rusty nuts and bolts. My coworker used to work at a sewage plant. He also refuses to eat Tilapia. I remember a story he told to me about seeing a Tilapia eat a floating piece of feces!
I know that store bought Tilapia is most likely farm raised so its meat isn't dirty, but you can also farm raise a rat.