I could offer you my perspective on it, since you've asked me for my opinion. Where I buy my fish and where I buy my cod, you can pay a pretty penny for cod and for high quality fish from Iceland and Norway. It's more expensive than the shrimp. We come back to this issue of quality and the quality of the product. I think you can attain a high price to go back to the fisherman from a good quality product.
The other aspect with the shrimp is that the they are a cold water species. We have been seeing this trend of warming water temperatures, and to some extent—we don't know, we can't nail it down precisely—that's probably affecting the shrimp.