since when did feeder automaticly meen goldfish?... outside of your world other fish are feeders...not all feeders are actually filled with thiaminase...to my recollection minnows and other small fish witch become feeders when you feed them to anything are from the same place as arowanas...yes everyone does jump on the bandwagon against feeders cause everyone including you think of goldfish as being the only feeder fish out there...i feed wc sunfish, perch, bullheads, crappie minnow/fatheads, shinners and suckers...all of them are feeder fish and not thiaminase rich...
so before you come off like you know all and i don't know what i am talking about think twice...as the world is much larger then what you see...
just an example...a 18" wolffish is a feeder fish for monster pbass in the wild....