What happened to all the Chinook Salmon? New research points to potential predators
In the 1960s, king salmon were abundant in Alaska, and it stayed that way through the 90s. After the new millennium, though, Chinook numbers fell — and they’ve remained low since. “People have scratched their heads and said, ‘Where are all the kings? What happened to all the kings?’” said Andy Seitz, an associate professor at the University of Alaska Fairbanks School of Fisheries and Ocean Sciences. At a lecture in Unalaska this week, Seitz explained how his research team has studied adult Chinook in the Bering Sea for the last three years. The project relied on pop-up satellite tags, which attach to salmon and measure the water temperature, depth, and ambient light of their environment. Seitz and his team think warm-blooded salmon sharks ate the kings and their tags, and the odd data was recorded when fish were trapped in the sharks’ guts. He also said they found five instances where marine mammals and other unidentified predators could have killed Chinook. Read the story here 18:41
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