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Once upon a time, tilapia was breed in a way where most of the fish would be male (which allows the fish to grow larger to a marketable size). However, they soon discovered a nifty little trick. If they put testosterone in their feed for the first few months, they would all turn male. Now, I havenÂ’t read of any adverse health effects from people eating testosterone feed fish. But I find the practice a little disturbing and unnatural. Not all fisheries use this practice, but it is very common. Secondly, some fish farms use growth hormones. We avoid growth hormones carefully in our meat, so why would we consume fish that contains it?
Their Food
While some fisheries may still use their natural food ( like duckweed), many, if not most fisheries feed them corn. Tilapia are easy to grow because, like pigs, they will eat anything, including “poop”. So it’s quite easy to grow them on corn. First, the corn is probably genetically modified.
That has itÂ’s own problems. Secondly, this high in corn diet leads to fish thatÂ’s high in Omega 6′s.
Wait, a minute! High in Omega 6 Fatty Acids?
High in Omega 6 Fatty Acids
One of the biggest health benefits of eating fish is getting Omega 3′s. You arenÂ’t going to find that in Tilapia. In fact, you may be doing harm instead of good by eating it!"
http://www.thenourishinggourmet.com/2010/01/farmed-tilapia-good-for-the-environment-bad-for-you.html
I don't know if there's a motive behind that article, but I know tilapia isn't generally a wild caught fish...not anymore.