And I don't understand the need to conceptually disambiguate internet posts that people lash off in 20 seconds. Consider the following:
A) B) According to the Law of the Excluded Middle, either A or B is true but not both.
http://www.chaos.org.uk/~eddy/math/found/reductio.html
I demand an explanation of this false statement!

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In my initial post I wanted to remind the OP that wild fish have issues of their own. Some people seek them hoping to avoid health problems arising from inbreeding and other careless practices. However, domesticated Oscars have had over a century to adapt to higher nitrates. Though I have no studies to cite, and the plural of anecdote is not data, by means of Pure Reason I hypothesize that wild Oscars will be more prone to HITH and other problems -- if their water is not kept in a state of Amazonian purity. For this reason alone I would never keep a wild fish.
As an addendum, I tacked on the (perhaps tautological) point that their fry will not be wild.