this post was submitted on 20 Feb 2025
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Possibly, but it's always been quite hard to tell. Whenever I get cans it's always in tiny flakes so I guess that could be from multiple tunas if one can needed a top-up etc.
If you get the more expensive brands or varieties it's more likely to be solid pieces vs a slurry.
If you buy more expensive tuna, you'll get cuts that are clearly from one fish. Albacore, for instance, I've never seen come in that shredded form.
Also, if you're interested in sustainability, look for line-caught tuna. It's not the only sustainable fishing practice, but it's an eat one to remember. In the US, there's an MSC certification on the can that's a reasonably indicator that the company practices sustainable fishing.
If you're getting cans full of flakes, it's probably not all from the same fish, or even the same kind of tuna.
Hmm looking at the can I got from Aldi in the UK, it says 'responsibly sourced' (whatever that means) but doesn't have an MSC certification. I'll see if I can find cans that do in future!
I think the MSC certification may only apply in the US. The UK probably has different certifications.
Ah no, I've seen the logo before and there's a report about it here: https://www.msc.org/docs/default-source/uk-files/msc-uk-tuna-shopper-report-2023.pdf?sfvrsn=5309aa2f_7
It feels like you're imagining a system where people are loading cans from sides of tuna, when in reality it's probably much closer to the cans being filled by a machine loaded with a hopper just packed full of large batch tun chunks.
This video seems to suggest that quite a lot of the process is manual: https://www.youtube.com/watch?v=mt3SbqYAbf4
People deboning, sorting it and so on. It's not entirely clear but yeah they seem to load hunks of meat in which I guess a machine then places into cans.
Yeah they don't show the actually canning step it seems, but it looked like they were sorting them into different batches and from my limited experience on packing lines things get big batched.