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Its the purine content not necessarily animal vs plant proteins, cat food wouldn't be too bad depending on the type of fish. Im not recommending it but for arguments sake it could be done. Not that you should even be feeding feeders high protein diets anyways. The real reason I see high protein diets (like dog and cat food) as bad for feeders is because it increases their uric acid content of the feeder on top of being a horrible gutload, roaches don't excrete uric acid so the higher their protein content of their diet the worse it will be (crickets don't either).We avoid gutloading with dog/cat food because of the ANIMAL protein, not because it just has generally higher protein content. Animal protein plus the added vitamins geared toward larger animals and digestive enzymes which are meant to help mammals, just don't bode well for either the insects or the reptiles that eat them. It's not normal food for them at all.
I don't know who deemed it suddenly ok to gutload with dog/cat food. It makes no sense when you look at it logically, it's just a quick and cheap fix to feed a huge colony.