“Long term, scientific surveys like this are really important,” said Doug DeMaster, director of the NOAA Fisheries Alaska Fisheries Science Center.
While the surveys sample a very small percentage of the ocean, biologists are able to detect changes to marine ecosystems over broad areas over time with the help of a little math,” DeMaster said. NOAA scientists and their collaborators sort, weigh and count species collected by each trawl. They will also gather specimens and data on various species, including a Gulf of Alaska project that involves deploying a camera and plankton pump to test whether or not larval rockfish associate with deep-sea corals.
The Gulf of Alaska continental shelf and upper continental slope survey includes two chartered fishing vessels, the F/V Sea Storm and F/V Ocean Explorer. Estimates of fish biomass and population derived from this survey will be used in annual stock assessments of Gulf of Alaska groundfish and ecosystem models. The survey began at Dutch Harbor on May 23 and runs through August 6, ending in Ketchikan.
The annual Eastern Bering Sea continental shelf bottom trawl survey, aboard the fishing vessels Alaska Knight and Vesteraalen, May 30 through August 8, monitors the status and trends in commercial fish and shellfish stocks, with the focus on walleye Pollock, Pacific cod, Greenland turbot, yellowfin sole, northern rock sole, red king crab, snow and Tanner crab. The survey begins and concludes at Dutch Harbor.
The Northern Bering Sea survey departs from Nome on August 8 aboard the Alaska Knight and Vesteraalen, and concludes August 30, with the vessels returning to Dutch Harbor. This survey monitors fish, crab and other bottom dwelling marine life in response to changing environmental conditions and loss of seasonal sea ice. This survey was last conducted in 2010, but scientists hope to conduct the survey biennially to more carefully monitor ecosystem changes.
The Gulf of Alaska surface trawl assessment survey and Southeast Alaska coastal monitoring, within the southeastern region of the Gulf aims to provide ecological data on pelagic ecosystems, examine oceanographic transport mechanisms, measure lower trophic level production and quantify age-0 marine fish, and juvenile salmon distribution and ecology. Plans are to repeat in August the pilot age-0 sablefish survey, NOAA officials said.
NOAA Fisheries and partners will conduct a fisheries and oceanography survey this summer and fall in the Beaufort and Chukchi seas, from August 1 to late September. They will assess distribution, relative abundance, diet, energy density, size and potential predators of juvenile salmon, other commercial fish, and forage fish.