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A clownfish cull I believe is very different from euthanasia as discussed in this article. Most marine fish breeders (and animal breeders in general) cull some of their stock to promote positive genetic traits. Believe it or not, even some dog breeders will either euthanize or give away puppies that don't meet certain breed standards. Fish that have been bred haven't been taken from the wild, therefore their fate makes no impact on natural reef ecosystems. My Goldendoodle was bred by an upscale breeder here in MD, but didn't meet the breeder's specifications. If someone hadn't given the puppy a home, it would have been euthanized. The moral ambiguity of this is a discussion for another place, as it doesn't really coincide with euthanasia as in a private aquarist deciding if a fish can be treated or recover and making the decision to end their life, in order to reduce suffering.I raise clownfish. I have to cull as many as 50%. So what?
I would say the same about feeding live fish as food for larger predators. Certain predatory fish require live food fish, just as they would in their natural environment. Regardless of what we feed our fish, whether it is frozen food, pelleted food, etc - chances are it was something that was once alive. Following the natural food chain in captivity is only, well, natural.
It's also worth noting that euthanasia doesn't stop with marine fish. It extends to corals and other invertebrates. I've known aquarists who simply "throw out" corals that show signs of disease or tissue necrosis. I've gotten colonies from fellow reefers, that they intended to toss due to a minor issue that simply required some fragging and dipping. Again, the moral question here is that many of these animals came from a wild reef and the potential for aquarists to simply discard and replace, rather than treat and save, becomes the moral question, at least in my view.