I know sockeye are generally low on the list of salmon pursued here. The most abundant salmon species are the pink, chum, and sockeye and the one thing they share, besides the ability to be super abundant, is they feed low on the food chain. The decline in these species at least should suggest problems with food supply in the Pacific. If there isn't enough for them, there is isn't enough for the forage fish that support the more popular Chinook and coho.