Honestly, I believe in providing a fish with a healthy environment, free from predators which they would encounter in the wild, I prevent their tanks from drying up during the dry season, so they live another year. Then I feed them almost daily, without them having to travel miles or wonder if they're going to be fed. Our understanding of nature is very limited and often interpreted by our own experiences. I'll list a few examples and some may not grasp the correlation, but give it a try.
How many of you guys enjoy feeding your fish until their bellies get fat? I do sometimes, its fun watching fish eat, amusing to us. Well, in the wild, that doesn't happen often at all, occasionally they gorge when available. Most predators have to hunt for their food, and it doesn't come daily. When fed too much, they develop fatty livers and organs, and often die a premature death, or in some cases cannot reproduce. Ask many Tanganiykan cichlid breeders, they keep their fish fed sparingly so they reproduce well. Ask the monterey bay aquarium, since the fish were fed so well, many developed fatty orangs and some had to be euthanized, even though they lived in the million gallon fish tank called the outer bay, with plenty of room to swim.
More example, siniperca chuatsi, they are ambush predators in the wild, probably only get a meal every now and then, but in a fish tank, when given tons of feeders to eat, they'll eat, until their bellies double the size of the, and I've seen, many times, they die from ruptured internal organs.
Fish keeping needs not the moral police to patrol. How about the fate of gold fish, we bred them for hundreds of years, and use them for tanks, carnavals, food for larger fish, have you ever looked into their eyes and think about their fate? If I had put an arapaima in a feeder bag, and fed it to my grouper, you all probably would lynch me. Thanks for taking the time to read this, and I know I probably have lost some of you already in the first paragraph. Comprehension and interpretation is also received differently with education, intelligent quotient, attention span and many other factors. I for sure, would not want to be the first to throw a stone, how about you (disclaimer-no one specific)