December 1, 2025 — NOAA Fisheries scientists are examining how ocean conditions influence Chinook and chum salmon bycatch in the eastern Bering Sea pollock fishery, one of the world’s largest seafood harvests. The new study, led by researchers at the Alaska Fisheries Science Center and partner institutions, analyzes more than a decade of observer data to identify environmental factors linked to salmon encounters.
Alaska’s pollock fleet lands more than 2 billion pounds annually, but unintentional salmon catch remains a longstanding management concern, particularly for western Alaska Chinook and chum stocks that have declined sharply in recent years. These salmon are important to regional communities and vulnerable to bycatch because their migration routes overlap with pollock fishing grounds. NOAA and the industry have implemented multiple avoidance measures, but managers say a clearer understanding of what drives bycatch is needed.
“This is an issue that’s the subject of ongoing discussions at North Pacific Fishery Management Council meetings,” said lead author and fisheries biologist Lukas DeFilippo. “There’s limited information available on how environmental factors affect bycatch, which could potentially be useful for informing ongoing scientific and policy discussions.”