Here is some interesting info on commercial tilapia production from SRAC :
http://srac.tamu.edu/index.cfm?catid=11 Including "With heavy supplemental
feeding, natural food organisms typ-
ically account for 30 to 50 percent of
tilapia growth."
Here is one on off-flavors in fish. As usual there is a lot more to it than what one would think. It can come (lots of types) from food but often it comes from the water (absorption).
http://srac.tamu.edu/tmppdfs/10464902-192fs.pdf
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