Shrinking Salmon in Alaska Will Hit the Global Fish Trade

Climate change and other threats to one of the world’s last bastions of wild salmon are already roiling the food supply chain and could alter U.S. export sales of the widely sought-after fish.

About 40% of the world’s wild salmon comes from Alaska, where fishermen are seeing fish size shrink. Scientists are still delving into the precise causes — it’s complicated because there are five different species of Pacific salmon in North America — but the consensus is that climate change is a main culprit.