March 13, 2020 — The following was released by NOAA Fisheries:
NOAA Fisheries scientists are part of an international team that set sail on April 11. They are studying the impacts of continued warm ocean temperatures in the Gulf of Alaska on Pacific salmon survival. It has been estimated that one-third of all Pacific salmon spend the winter in the Gulf of Alaska. While reduced in size compared to previous years, the current marine heatwave affecting the Gulf remains one of the top five largest heatwaves on record in the North Pacific in the last 40 years.
“Salmon affect more people culturally, economically, and recreationally than any other fish in the world,” said Doug Mecum, Deputy Regional Administrator for NOAA Fisheries Alaska Region. “This International Year of the Salmon expedition in the Gulf of Alaska expands international salmon research on the high seas to build understanding of how a changing climate may influence salmon ocean habitats, distributions, and productivity.”
Scientists suspect young salmon that can find sufficient food and experience enhanced early marine growth are those that best survive their first winter at sea. The survival of these fish largely determines the size of subsequent adult salmon populations. So, scientists think that environmental conditions have the greatest influence on salmon survival during their first year at sea.
“We know that ocean and climate conditions play a major role in regulating salmon abundances,” said Wess Strasburger, who will serve as chief scientist on the first leg of the survey. “But we don’t have a good understanding of the mechanisms regulating salmon abundances in the ocean.”