May 28, 2021 — The following was released by NOAA Fisheries:
Scientists from NOAA’s Alaska Fisheries Science Center and partners have begun another busy survey season off the Alaska coast. Eight surveys are planned in the Gulf of Alaska, Bering Sea, and Chukchi Sea to monitor fish, crab, marine mammals, and marine ecosystems.
“Information collected as part of these surveys and other available data on oceanographic conditions, fisheries, and protected species are integrated to provide a more comprehensive understanding of Alaska marine ecosystems to support sustainable resource management and conservation,” said Robert Foy, science and research director, NOAA Fisheries, Alaska Fisheries Science Center.
During surveys, NOAA scientists sort, weigh, and count species collected by longline or trawl. They will also collect specimens and data on various species, as requested by cooperating scientists, agencies, and institutions.
Longline Survey of the Bering Sea and Gulf of Alaska
The annual longline survey is an important data source for producing timely resource assessments for the North Pacific Fishery Management Council. The 2021 survey continues a 44-year time-series of sablefish and other groundfish species stock trends. The survey is being conducted from May 28 to September 1 aboard the F/V Alaskan Leader, which is a 150-foot freezer longliner.
The 2021 survey begins in Dutch Harbor and makes port calls in Ketchikan, Yakutat, Cordova, and Kodiak. The survey samples the Gulf of Alaska every year, the Bering Sea in odd-numbered years, and the Aleutian Islands in even-numbered years. It surveys at depths from 200 to 1,000 meters. The survey produces catch rates, species compositions, length, and age data for:
- Sablefish
- Pacific cod
- Several rockfish species
- Shortspine thornyhead
- Sharks
- Grenadiers
- Greenland turbot
The survey also tags and releases a subsample of sablefish, shortspine thornyhead, and Greenland turbot for studying movement behavior and life history. The survey operates on a cost-recovery basis: proceeds from the catch are sold to offset the cost of the vessel charter.