We tend to think that in a trade-off there are positives that outweigh the negatives, but as many colloquial expressions attest, some things don’t lend themselves to a trade-off. The Chinese say you can’t have a horse that runs fast yet consumes no food; the Danish say you can’t both blow and have flour in your mouth; and the Germans say it’s an impossibility to want someone to “Please wash me, but don’t get me wet.” In English, we say “You can’t have it both ways.”Approximately 200 miles southwest of Anchorage lies Bristol Bay, sometimes characterized as the type of …