I dont mean for this to be a personal attack, I just think its a mixup with common names.
Not at all. That is why the scientific community uses Latin names - to avoid this cultural common-name mishmash. I'll take a look over at spearboard and see what the heck they are eating - probably an invasive.
By the way, the invasive grass carp (superior mouth, planktivore) is all but fished out of its native Asian waters. Conversely, large-mouth bass and bluegills have destroyed ecosystems in Japan and Europe.
There is a new selection pressure for all animals of the world - make every effort to taste bad to humans.