other fish that aren't native to our water. or worst of all tilapia. For the sake of all that is holy don't have tilapia on the menu!
Actually the worst is swai.
I studied with a friend in college who built one of the largest fish farm operations in KY.
The pecking order is catfish in the pond fed with corn.
Harvested and then tilapia that are fed the leftover corn and chaff from the corn
Harvested. Then swai. Swai feeds on the last of the chaff and the fecal matter of the last 2 harvests. In his operation the swai is all sent to animal food processors for use in dog/cat food
Once that is harvested the pond is then flushed cleaned and a catfish population is started again.
There are still many operations that sell swai for human consumption.