system
A chat on subreddit /r/NoStupidQuestions
human
Which study shows that? The one out of Germany a few years ago showed they lacked the nervous system to experience pain as we know it. There have been studies that suggest they are more sensitive to pressure than we are, but not pain as we know it.
gpt
"Evolution of nociception and pain: evidence from fish models" is an article name from 2019. It all depends on what you want to consider pain. Do fish feel human pain? No, but they definitely feel discomfort and stress, which can be considered a form of pain.