Thanks for the kind words, Johannes!

That's a great question, and you're exactly right that our "increasing confidence" is focused on answering questions like that.

One of the reasons we started the Humane Slaughter Initiative was to deploy stunners in different regions and contexts in order to remove barriers to uptake. The industry was telling us that humane slaughter wasn't possible in this or that context for one reason or another. We thought it made sense to try it out and understand the barriers in each context better.

We're still very much in this learning phase, and due to the variety of contexts we've deployed stunners in, there isn't really a "given stunner" - effectiveness varies significantly by context, equipment type, species, and operational practices. Additionally, we're exploring New Solutions & Protocols, which further complicates providing a single answer.

What I can say is that:

• We’ve seen successful implementation in multiple contexts, but with notable variation
• Our monitoring suggests that proper training and ongoing support are critical factors
• This variation is exactly why we’re prioritising better M&E systems and implementation support

I’m hesitant to give a specific confidence curve right now because (1) it would likely be context-dependent rather than universal, and (2) improving this is an active focus area for us, so any number I give today could anchor people’s thinking even as we make progress.

It’s a goal of ours to publish more research and data as we collect over the next 12 months. This will help donors and industry partners better understand effectiveness across different contexts. So, stay tuned for those developments in the coming year :)

To build on Michael's point - AIM has been recommending "Fish Welfare Initiative in a new country" since at least 2023. And another fish welfare charity in Europe can be thought of as taking Shrimp Welfare Project's model and applying it to fishes.

For (what became) Scale Welfare, my understanding is that many potential co-founder pairings fell apart due to the time needed in country (and I would also guess that the Program attracts people who want to start something new, and founding a similar project isn't as exciting as something brand new).

I also think a main reason AIM probably aren't recommending more is because of their modest prioritization value, and wanting to recommend charities that maximise impact over a range of worldviews. I imagine there probably could be a world where AIM exclusively incubated aquatic animal welfare projects, but they (understandably) have epistemic uncertainty about this.

(There's also probably an argument that the ecosystem can only really accommodate 1-2 new projects per year, and not a flood of new projects all at once).

Then, one day, his wife, a social worker who’d spent her career supporting refugees

Oh so you’re helping refugees?

I think Heather Browning has an upcoming book project about Interspecies Welfare Comparisons - here's an example of her published work on the topic

Thanks Vasco :) 

Precision Welfare - I appreciate your feedback here. I've had some positive responses from industry folks on this term, but I'm not locked into the specific language around this just yet - do you have any thoughts on other ways to frame this idea?

Certifiers - That's true. I guess the wider point I wanted to make here is that I think people are locked into a particular view of what certification looks like - and I think there is a lot of scope for ways to reimagine certification that is more innovative and responsive.

False credits - Yep good point. I think requiring more monitoring on farms to verify that producers aren't falsifying credit generation would be a good thing. This is actually one of the reasons why we're interested in Precision Aquaculture technology here - having automated sensors that could detect both pre-stunning movement and effective stunning outcomes would create a more robust verification system than relying solely on periodic inspections or self-reporting.

Per shrimp / per kg - Producers sometimes do "partial harvests" throughout a crop (to recoup losses in case of a future disease outbreak, or to reduce biomass so that the remaining shrimps can grow larger without straining the pond's carrying capacity, etc.). So my assumption (if we paid on a per shrimp basis) would be that it would incentivise farmers to stock higher at the beginning - then do a partial harvest as soon as feasible to generate credits - then continue to grow the remaining shrimps until the full harvest. 
Also, I think meeting the industry "where they're at" is often useful - if the industry already trades on a per kg basis, it makes it much easier to integrate credits into this system if we also use per kg.

Hi Angelina, Austin, and Vasco :) 

Apologies for all the confusion here - in terms of the idea I'm presenting in the post I think Vasco has done a really great job of summarising the idea above.

But I think the conversation above has helped me recognise a distinction that I don't think I'd articulated particularly well in my post, which is that I see a difference between the application of credits for contexts like shrimp stunning, and the wider application of credits for animal welfare more broadly:

1. As a transition tool (as in shrimp stunning credits) - In the case of offsetting "bad" practices, credits aren't intended to be very valuable, just a way to unblock logistical issues of transitioning a supply chain. Ultimately we want a situation where no-one is buying stunning credits because they've all directly transitioned their supply chains. (Again, I think Vasco actually does a great job of outlining my sense of how this would work without increasing shrimp production in his comment below).
2. As a tool to put a price on positive welfare (similar to Paul Christiano's Demand Offsetting proposal - thanks @Austin! I hadn't read this article before) - In cases of trying to optimise for "good" practices (where an improvement could lead to net positive lives for farmed animals), I wanted to paint a picture of a world where credits could be used to create lasting mechanisms that financially incentivise these welfare improvements.

Also, I've just realised that I've referenced @Vasco Grilo🔸's comments a few times in this reply to help clarify my thinking - just wanted to say that I really appreciate your help in articulating the points I wanted to make!

Thanks Pete :) 

Good question! The margin on the merch is pretty slim (around 20% per item, depending on what you get), we mainly use it as an awareness tool rather than a major fundraising channel.

So if you wanted to distribute t-shirts/stickers to friends, then I agree it probably makes more sense to get a bunch made up yourself rather than buy them through our store.

Thanks Vasco :) 

And good spot on the repeat! I've edited that out now

Thank you to Vetted Causes for this thoughtful review of Shrimp Welfare Project's work. I appreciate both the recognition of our cost-effectiveness and the constructive feedback on areas where we can improve.

I wanted to address a few points raised in the review:

• Regarding monitoring stunner usage: It's worth noting that our current monitoring approach is consistent with standard practice across the animal welfare movement, such as cage-free campaigns. Like these initiatives, we rely on retailers and producers facing potential public backlash if they fail to honor commitments made to their stakeholders. While this approach has driven significant progress in animal welfare to date, we're excited to go further. We're actually piloting the first version of a direct monitoring system in the next few months, with plans to iterate and improve as we learn.
• On public information: This presents an interesting challenge for us. Our website must primarily serve industry stakeholders, whose communication expectations differ significantly from those in the EA community. Detailed numerical analyses and assumptions that would be appreciated by EA readers can sometimes be off-putting to corporate audiences. We're actively trying to navigate this balance between different audience needs while maintaining our effective engagement with industry partners.
• That said, we're committed to transparency: We have prioritised our MEL (Monitoring, Evaluation, and Learning) initiatives by transitioning our MEL Officer from a part-time to full-time role. She is currently upskilling through the AIM Research Program and will finish at the end of June, meaning Shrimp Welfare Project will have much stronger MEL capacity from the second half of 2025.

We're grateful to be part of a community that values both impact and transparency, and we look forward to continuing to improve our work to help billions of shrimps.

I think the general point still stands that we want to advocate for more aquatic animal charities in the space.

Even if you think shrimps are the most cost-effective donation opportunity currently, a key point we wanted to make was that just because there is a Shrimp Welfare Project doesn't mean that there isn't space for more orgs.

There are a number of things SWP is not pursuing that could be really impactful, like working on shrimp paste, or brine shrimp, or fish fry.