Far more animals than previously thought likely have consciousness, top scientists say in a new declaration — including fish, lobsters and octopus.
Bees play by rolling wooden balls — apparently for fun. The cleaner wrasse fish appears to recognize its own visage in an underwater mirror. Octopuses seem to react to anesthetic drugs and will avoid settings where they likely experienced past pain.
All three of these discoveries came in the last five years — indications that the more scientists test animals, the more they find that many species may have inner lives and be sentient. A surprising range of creatures have shown evidence of conscious thought or experience, including insects, fish and some crustaceans.
That has prompted a group of top researchers on animal cognition to publish a new pronouncement that they hope will transform how scientists and society view — and care — for animals.
Nearly 40 researchers signed “The New York Declaration on Animal Consciousness,” which was first presented at a conference at New York University on Friday morning. It marks a pivotal moment, as a flood of research on animal cognition collides with debates over how various species ought to be treated.
But some animals we eat are carnivores, like most wild-caught fish. In which case, killing them reduces the total amount of suffering. Same reasoning as the trolley problem.
Even that’s a bit more complex, without predators many species massively overbreed, leading to mass starvation
That wouldn’t apply to ecosystems where the predator is invasive, for example the lionfish in the Caribbean (which happens to be delicious).
Furthermore, if there is concern for a population explosion then one could also kill and eat the predator’s prey, provided you eat fewer than the predator would have eaten.
We, as omnivores, have a choice. The carnivores do not. I’d rather not cause more suffering than I have to (since I have that choice) even if there was the potential that it could possibly decrease overall suffering.
I will not go into other problems with fish specifically since it’s not on-topic.
Whereas I choose to cause suffering if I expect it will reduce greater suffering, including killing animals if necessary.
Everyone has their own approach to the trolley problem.
Do note that this whole thing is based on the hypothetical of plants being capable of experiencing pain. In reality, they do not possess a nervous system to enable that.
Of course I’d choose to kill an animal if the alternative was getting injured or killed (or starving in some extreme survival situation), but in day-to-day life, I do not see the need to do that.
If the only way to stop a school shooter were to kill them, I think most people would do so even if they were not personally threatened.
And many people, including myself, think it is moral to kill even an innocent person if necessary to prevent the death of a greater number of people. That’s the trolley problem in a nutshell.
But if I’m willing to kill a person in order to prevent them from killing other people, then I should also be willing to kill a fish in order to prevent it from killing other fish.
Finally, the argument for nonhuman sentience does not turn on the presence or absence of neurons. That would just be a cellular version of speciesism, and it inexplicably eliminates the possibility of sentience in extraterrestrials or machines.
The argument in the OP is based on behaviors, like recognizing self vs nonself, avoiding noxious stimuli, creative problem-solving, etc. Plants do many of these things too, just on longer timescales.