Seems possible in principle. Experiences can cause one to feel more or less pain--what's wrong with quantifying it? Sure it will be a bit handwavy and vague, but the alternative of doing no comparisons and just going based on vibes is worse https://www.goodthoughts.blog/p/refusing-to-quantify-is-refu.... But as I argue, given high uncertainty, you don't need any fine grained estimates to think giving to shrimp welfare is valuable. Like, if there was a dollar in front of you and you could use it to save 16,000 shrimp, seems like that's a good use of it.