I don't doubt this to be true, but I must say, given what we know about how poorly salmon survive fishing encounters in the salt, that it seems a bit misguided, to say the least. Killing more fish to harvest a target component is poor management of dwindling stocks. Selective fishing works much better in terminal areas, because unintended catches tend to survive at a much better rate. Additionally, in terminal areas, the fish are all as big as they're going to get, meaning far fewer encounters with undersize fish.

It doesn't take a rocket scientist to understand why so many fish caught in the ocean are undersize. If catching undersize fish is not what we want to do, we ought not fish where the majority of the fish fall into that category.