Nile Tilapia -- Oreochromis niloticus. http://fl.biology.usgs.gov/projects/tilapia_salinity.html
I would guess this guy was dumped, rather than being part of a population. On the other hand, the lake down the street from my parents house got tilapia -- one year I saw a couple, the next year the lake was full of them. This is in central Florida. My understanding is that tilapia are sensitive to cold water, so it's surprising to see one this far north. The tilapia in my lake would not take any flies, so good for you bagging this guy.
I am not sure that I would eat a tilapia that grew up in the Potomac system. They are omnivorous, and eat a lot of the same gunk that carp and catfish do. I would follow the same recommendations as those species: http://www.vdh.virginia.gov/epidemiology/DEE/PublicHealthToxicology/Advisories/PotomacRiver.htm
They are mediocre eating, anyway.
--Miles
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http://www.tpfr.org
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