November 23, 2021 — Researchers are predicting low fish runs in the Norton Sound and Northern Bering Sea region again next year, according to research biologist Jim Murphy.
Murphy, who works with the Salmon Ocean Ecology and Bycatch Analysis Group at the Alaska Fisheries Science Center in Juneau, presented the findings of the recent 2021 surface trawl survey during a Strait Science event. The survey, which tracks marine life across the surface and midlevel of the northern Bering Strait, was conducted in September this year. Researchers studied salmon, seabirds, shrimp, zooplankton and several other marine species.
The surface trawl survey has been conducted every year for almost two decades, and Murphy says when the survey is conducted is crucial. “The timing of the survey was established at the beginning to match the timing of marine entry and dispersal of juvenile salmon from estuarine habitats, and we’ve attempted to keep the timing of the survey as consistent as possible.”
Though the primary purpose of the surface trawl is to track pelagic fish, or species found in the middle and upper water columns, and invertebrate populations, researchers also collect zooplankton and sediments, as well as bottom-dwelling fish, crab and invertebrates.