Saving Seafood

Climate Change Raises Risk of Prey Mismatch for Young Cod in Alaska

March 30, 2021 — The following was released by NOAA Fisheries:

For a young Pacific cod, first feeding is a life-or-death moment. Cod larva are nourished by a yolk sac after they hatch. Once the yolk sac is depleted, they must find food within days in order to survive. If there is no prey available during that critical window for first feeding, young fish face starvation.

Warming Alaska waters are increasing the risk of prey mismatch and starvation for cod larvae, a new study finds.

NOAA Fisheries scientists collaborated with our partners to look at how temperature shifts affected first feeding Pacific cod larvae in two large ecosystems: the southeast Bering Sea and Gulf of Alaska. The models made predictions for 1998–2019, a period that encompassed warm and cool years, including a series of extreme heatwave events beginning in 2014.

“Warming can increase the metabolic demands of fish and shift the timing of their food production. So you have temperature unravelling the system, moving food around. And you have fish needing food now. When mismatched prey timing and increased metabolic demand line up, it can be pretty disastrous,” said Ben Laurel, NOAA Fisheries scientist at the Alaska Fisheries Science Center, who led the study. “The better we can understand and predict these effects, the more effectively we can manage them now and in the future.”

Read the full release here

Alaska Fisheries Science Center 2020 Year in Review

March 22, 2021 — The following was released by NOAA Fisheries:

The Alaska Fisheries Science Center was able to accomplish a lot in FY 2020 despite the need to cancel some important field research and fish, crab and marine mammal surveys due to the COVID-19 pandemic.

It was a year of perseverance, creative thinking, and flexibility.

Our scientists took major steps to adjust the way we do business, protecting staff, communities and research partners while delivering critical science to support resource management and conservation efforts in FY20-21.

Some Highlights:

  • Set up makeshift, home-based labs to conduct critical process studies to provide age and diet information to inform fish and marine mammal stock assessments.
  • Employed innovative technologies to collect and more efficiently analyze data safely (e.g., sea going and aerial drones, artificial intelligence, remote camera and underwater acoustic monitoring systems, and sophisticated camera systems that simultaneously collect color, infrared, and ultraviolet images, etc.)
  • Substantially overhauled standard operating procedures to work with fisheries observer provider companies to deploy Federal fisheries observers on fishing vessels and in seafood processing facilities to collect needed data so fisheries could continue to operate and provide seafood to the nation and the world throughout the pandemic
  • Designed new modeling approaches to estimate fish and crab abundance to account for data limitations due to some cancelled surveys and research activities
  • Provided critical socio-economic analyses of COVID-related impacts on the commercial and recreational fishing industries
  • Increased collaboration with research, co-management and industry partners to monitor and collect data safely for bowhead whales, humpback whales, harbor seals, gray whales, Steller sea lions, northern fur seals, California sea lions, and commercially valuable pollock, red king crab and sablefish
  • Organized and safely supported a major ecosystem survey in the Bering Sea and Chukchi Sea during the pandemic
  • Completed a successful environmental DNA (eDNA) proof of concept in the inshore waters around Juneau, AK
  • Enlisted the help of state and academic scientists, Alaska Indigenous communities, private companies and others to collect ecosystem information and provide critical context for resource management decisions this year

Read the full release here

Water Clarity Study Sheds Light on Bering Sea Change

March 18, 2021 — The following was released by NOAA Fisheries:

In 2004, Alaska Fisheries Science Center biologists began attaching light sensors to Bering Sea survey bottom trawls to evaluate the effects of light on fish catchability. Fifteen years later, researchers looked at this unique dataset in a new light to reveal much more about the dynamic Bering Sea ecosystem.

NOAA Fisheries scientists collaborated with our partners to develop an automated process to translate these data into the first long time series of subsurface water clarity for the eastern Bering Sea.

“Until now, there was very little long term information on subsurface water clarity in the Bering Sea,”  said Sean Rohan, the NOAA Fisheries Alaska Fisheries Science Center biologist who led the study. “Working with the annual surveys provided unprecedented spatial coverage and resolution over a span of 15 years.”

Their approach provides a tool that expands possibilities for research in other regions. Their findings reveal patterns and trends in water clarity over depth and time that enhance our understanding of recent and future changes in the Bering Sea.

Read the full release here

Preliminary Results of e-DNA Study Shows Promise for Improving Understanding of Nearshore Habitats for Fish and Crabs in Alaska

February 25, 2021 — The following was released by NOAA Fisheries:

Many marine fish and crab species spend their critical early development stages of life in shallow, coastal waters. Scientists at the Alaska Fisheries Science Center’s Auke Bay Laboratories conducted a pilot study using environmental DNA (eDNA) techniques in 2020. They identified more than 40 species in nine sites around Juneau, Alaska.

Every marine organism sheds small amounts of tissue and waste into the water. This material potentially contains eDNA from the source organism. Genetic analysis of the eDNA can help us to identify species and detect the diversity of species. It can also possibly determine the abundance of each species that have been present in the water sample even days after the organism has left the area. Environmental DNA can complement traditional surveys that are able to identify the age or size of a species.

The major objective of this study was to demonstrate that eDNA metabarcoding represents a feasible and cost-effective alternative to traditional sampling for collecting species diversity data and identifying Essential Fish Habitat (EFH). While eDNA has been used to assess biodiversity in many environments, it is important to verify the technique and compare it to data collected from traditional surveys to ensure that results are robust. This is especially important in dynamic environments such as those found in Alaska, where variables such as large tidal swings and severe weather can influence eDNA transport and detection.

“There are so many ways eDNA research can help us do our jobs better,” said Wes Larson, program manager, Genetics Laboratory. “We are able to detect a fish after it has left an area. It is also a less invasive means for sampling habitats that enables us to detect cryptic fish. Cryptic fish are fish that may not typically be sampled in traditional survey gear or may be a rare or low-density organism that surveys miss. Additionally, eDNA can help us detect important pelagic fish like cod and pollock that may be offshore and could avoid smaller nets. ”

Read the full release here

NMFS reports fishing revenue crashed 29 percent in pandemic

January 19, 2021 — The U.S. fishing industry lost nearly one-third of its revenue in the first seven months of 2020 as the covid-19 pandemic vaporized its major markets, according to a new analysis by NMFS.

The year started on a high note, with revenues up 3 percent in January and February – before diving 19 percent in March and cratering at 45 percent less in July, said Paul Doremus, deputy administrator for operations at NMFS, in a telephone conference with reporters Friday.

Cumulatively, “over those seven months we’re looking at a 29 percent decrease,” said Doremus.

The agency mobilized its economic experts and government and academic partners in March to document the impact of the pandemic and begin preparing “as comprehensive an account as we could,” said Doremus.

The findings were compiled in a report with more than 100 pages of supporting documents, including detailed region-by-region breakdowns, by authors and economists Rita Curtis of the NOAA Fisheries Office of Science & Technology and Steve Kasperski of the agency’s Alaska Fisheries Science Center.

While the report only documents the industry’s situation up through July, “we’ve already initiated the work to do that next update,” said Curtis. The goal is to continue monitoring economic impacts and fishermen’s response, drawing lessons and strategies for making fishing communities more resilient, said Doremus.

Read the full story at National Fisherman

Distribution and Abundance of Forage Fish in Arctic and Sub-Arctic Waters Affected by Warming Ocean Conditions

January 14, 2021 — The following was released by NOAA Fisheries:

Pelagic or forage fish species are an important source of food for marine predators in the eastern Bering Sea. This group of fish includes capelin, Pacific herring, juvenile chum salmon, juvenile pink salmon, juvenile sockeye salmon, and walleye pollock during their first year of life.

A new study by scientists at the Alaska Fisheries Science Center shows variable effects on species distribution and abundance. It looked at several warm periods from 2002–2018 when ocean temperatures were warmer than average for four or more consecutive years.

Previous studies by NOAA Fisheries documented a northward shift in age-0 pollock, juvenile salmon, herring, and capelin during the 2002-2005 warm period relative to the 2006-2011 cool period in the eastern Bering Sea.

“However, this is the first study to look at temperature-related changes in the distribution and biomass (total average weight of all fish) of pelagic fishes over multiple warm periods,” said Ellen Yasumiishi, researcher, Alaska Fisheries Science Center and lead author for the study. “Studies like this are also important for understanding factors that may affect juvenile salmon and age-0 pollock growth, development and ability to reach maturity. As adults these fish are targeted by commercial, recreational, and subsistence fisheries in Alaska.”

Read the full release here

ALASKA: Some Fishermen on Edge After Rough Year in North Pacific

January 6, 2021 — Some fishermen in the North Pacific Ocean are on edge ahead of a traditionally fruitful winter fishing season, following a rough 2020 that saw catch rates fall below long-term averages.

The coronavirus pandemic forced the cancellation of some research surveys, making it more difficult to determine how many fish are in the Bering Sea off Alaska, the Seattle Times reported Monday.

The Seattle-based Alaska Fisheries Science Center canceled five of six research missions that help scientists measure fish stocks because of fears of virus outbreaks at sea.

Fishermen have begun their two-week coronavirus quarantines ahead of the Jan. 20 start of the fishing season and aren’t sure what they’ll find once ships largely based in Washington state make their way to the Bering Sea.

“This is the best time of year,” said Kevin Ganley, who captains a 123-foot (37-meter) boat called American Beauty. “If (the fish) are not there, we’re in trouble.”

Read the full story from the Associated Press at U.S. News

Due to COVID-19, Drone Survey Powers NOAA’s Bering Cod Assessment

December 30, 2020 — Every other year, NOAA Fisheries conducts an acoustic-trawl survey from crewed research vessels to measure pollock abundance in Alaska’s eastern Bering Sea. As a result of COVID-19, many research surveys were canceled, and we weren’t able to conduct our walleye pollock surveys. Data collected from these surveys are critical to manage pollock, which comprise the nation’s largest commercial fishery.

NOAA Fisheries scientist Alex De Robertis at the Alaska Fisheries Science Center developed a contingency plan: conducting the survey with saildrone wind- and solar-powered ocean-going robots. The hope was to collect some data despite the vessel survey cancellation.

For the past several years, De Robertis and colleagues at the Alaska Fisheries Science Center have been working with partners at NOAA Research’s Pacific Marine Environmental Laboratory,  Saildrone and Kongsberg. They use uncrewed surface vehicles equipped with low-power sonar (acoustic) sensors to conduct research in the Bering and Chukchi Seas. The pollock survey contingency plan was an opportunity to apply what they had learned to collect data for resource management.

Read the full story at The Maritime Executive

Size of Alaska’s Western Aleutian Island Passes Larger than Previously Thought

December 15, 2020 — The following was released by NOAA Fisheries:

There are thousands of small islands that comprise Alaska’s Aleutian Island chain, but only a few dozen significant passes among those islands. These passes are important bottlenecks for water exchange among the North Pacific, Gulf of Alaska, and the Bering Sea. However, until now there has been limited detail on estimates of pass location, size, shape, length, and depth.

“Flow estimates have been based on rough pass size estimates from over 50 years ago,” said Mark Zimmermann, fisheries biologist from the Alaska Fisheries Science Center. “We have updated information for eastern, western and central passes along the Aleutian Island chain. This new information will help oceanographers and ecologists better quantify impacts of water flow on Alaska marine ecosystems and better understand environmental and ecological changes that are taking place.”

Two new NOAA Fisheries’ studies provide more detail on the size and extent of the passes and the shoreline around the Aleutian Islands.

One study showed that all of the western-most Aleutian passes, from Kavalga to Semichi, are larger (18 to 71 percent) than previously reported. The last study was conducted for this area in the 1960s. This includes Amchitka Pass (+23 percent), the largest in the Aleutians.

The other study focused on the easternmost pass, False Pass, which posed a particular challenge for co-author Zimmermann. False Pass is unusual: it’s the only Aleutian pass that directly connects the shallow shelves of the western Gulf of Alaska and eastern Bering Sea. It is also the only pass with constricted southern and northern openings. We found this pass to have a single northern inlet to the Bering Sea—however, until recently it had two. This conflicts with current navigational charts, depicting two inlets to the Bering Sea now, compared to just one on the older charts (1926–1943).

“Our analysis of eastern pass sizes compared to the results of the 1960s study generated mixed results,” said Zimmermann. “In some cases, our pass size estimates were larger while in other cases they were smaller than previous estimates.”

In 2005, NOAA scientists updated information on some of the eastern and central passes. When Zimmermann looked at the two eastern passes from that study, he found that they were actually larger than previously thought. He also found that five central Aleutian passes were smaller than reported. The earlier study did not examine western pass sizes. The new studies include much more detailed information about the seafloor and shoreline that was not available at the time of the earlier analyses. As a result, they will be a great new resource for oceanographers and ecologists studying marine systems.

Read the full release here

Russian and American Scientists say warming water is pushing Bering Sea pollock into new territory

November 20, 2020 — In a new study, scientists have linked warming Arctic temperatures, changing wind patterns and shifting currents to movement of commercially valuable Alaska pollock in the Bering Sea.

The Bering Sea has seen the loss of a summer cold water barrier in recent years, which used to keep pollock from spreading out and moving north.

But while scientists are seeing drastic shifts in pollock movement patterns, further research needs to be conducted to know what the changes mean for communities like Unalaska and Dutch Harbor and the billion-dollar pollock industry.

“This research is really critical because pollock are a key ecological component of the Bering Sea shelf food web supporting the largest commercial fishery in the U.S. by biomass,” said Robert Foy, NOAA’s Alaska Fisheries Science Center director. “To get an accurate assessment of pollock abundance so that resource managers can set sustainable catch limits, we have to be able to understand pollock distribution, which certainly looks different under a warm water regime.”

Read the full story at KTOO