that's likely larger and more mature presorted units. Salmon can eat smaller ones. You can tell from the price that those cost more than actual salmon.
I am not expert, I am just speculating that if you dig into details, picture can be very different.
I didn't get who are those "we" and where it was stated and by who, and why that who is an absolute authority in this discussion that any other opinions are labeled as "irrelevant"