Saw this post by @Henri Thunberg 🔸 on Twitter:
If true, these numbers are suprisingly low to me. Eyestalk ablation gets quite a bit of attention on the forum. Shrimp Welfare Project focuses on it and it forms part of their Shrimp Welfare Index. It gets attention from various animal welfare groups (Mercy For Animals, Animals Australia). A post on Reddit about it from a couple of days ago has 35 k upvotes and 2000 comments. An Australian politician recently posted about it. A lot of this attention, I suspect, is based on the false impression that this is happening to most or all of the shrimp.
The numbers of animals involved seems like pertinent information but I can't see the number mentioned on the Shrimp Welfare Project website, nor on any of their forum posts. Rethink Priorities wrote a report here that on page 13 seems to estimate that there are ~2 million female broodstock shrimp in the world (compared to 600 billion farmed shrimp per year). They seem to estimate this going backwards from the total number of shrimp and the number of eggs produced per female.
Any other numbers/sources?
The right messaging strategy long-term is to be transparent, honest and rational. Shortcutting this is risky, through the three mechanisms I mentioned in last comment.
SWP doesn't primarily focus on ablation. Where they do, they should keep in mind and make it clear that they're talking about <0.1% of farmed shrimp.