This was actually (part of) MUJI's concept at launch. An example is selling broken-off mushrooms: "For example, there was a poster of dried shiitake mushrooms that were slightly damaged during the production process. In the Japanese market, only perfectly round shiitake were sold, but MUJI sold imperfectly shaped shiitake because they taste just as delicious. In another poster, the copy reads “The entire fish is salm…
I heard once that some steaks sold are actually separate pieces of meat glued together and made to look like a natural steak. Maybe this happens with fish as well. Wouldn't "the entire fish is salmon" be referring to that there's no pieces of other fish glued to the fillet? I mean, perhaps there's a legal technicality where it's permissible to sell a product as salmon when at least 10% is actual salmon or so.
It's kind of like how all those sweeteners sold as being stevia are actually only like 1 or 2% stevia.