One point to keep in mind is that the vast majority of ponds that are fed are not like aquariums because the ponds are only engaged in supplemental feeding with the fish geting a large % of their diet from natural sources.
True so its even more crucial aquarium fish get a good diet. Carnivores get very little if any starch naturally. However that doesn't mean they can't use it. I have come to believe the ability to use starch is a survival mechanism.
