Why not overlap salmon and halibut? I know they'll say so when they flyover they know all the boats they count are fishing for one or the other. Why not do the flyover and then prorate effort according to the percentages gathered at the dock? Seems like a big hit to our potential fishing experience for their intellectual laziness.
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. . . and God said unto them, Be fruitful, and multiply, and have dominion over the fish of the sea . . .