Saving Seafood

Near-Infrared Technology Identifies Fish Species from Otoliths

July 7, 2020 — The following was released by NOAA Fisheries:

Aim a beam of near-infrared light at an otolith, and it reflects a literal spectrum of information on the biological and environmental history of a fish.

NOAA Fisheries scientists are developing ways to use near-infrared spectroscopy (NIRS) analysis of otoliths (fish ear stones) to provide accurate information for sustainable fisheries management faster. NIRS has already proven its value as a time- and cost-effective method to determine the age of fish.

Now, for the first time, scientists have used NIRS analysis of otoliths to identify fish species and populations. The new technique successfully differentiated 13 marine fish species from four large marine ecosystems around the country.

“Our study shows the potential of NIRS as a fast and reliable method of identifying fish species and populations,” said Irina Benson, Alaska Fisheries Science Center biologist. She led the study with Age and Growth Program colleague Thomas Helser and Beverly Barnett of the Southeast Fisheries Science Center. “This technology could provide information for stock assessment and management faster than traditional methods. It expands the possibilities for collecting data to support ecological studies. It is a big step forward for NOAA Fisheries’ strategic initiative to develop NIRS technology for fisheries science.” 

Read the full release here

Study: Marine heat waves will decimate fish at twice the rate climatologists previously predicted

June 9, 2020 — Over the last decade, two massive marine heatwaves, better known as “blobs” swept the North Pacific Ocean, raising surface temperatures more than 5 degrees Fahrenheit causing blooms of toxic algae and major die-offs in the ecosystem. A new study from the University of British Columbia reports that as these heatwaves continue, they may have far more devastating implications to fisheries than previously predicted.

Climate scientists have known for years that global warming would have devastating long-term impacts on marine species. Already, fast-melting Bering Sea ice is threatening spotted seals and other marine mammals. Warming Gulf of Alaska waters wiped out cod eggs in 2019, causing a crash in cod stocks. Record warm waters in the Yukon River last summer killed thousands of migrating salmon with heat stress.

While climate change is steadily warming oceans all over the world, marine heatwaves, like the two North Pacific “Blobs,” are causing more dramatic swings in surface temperatures. In 2014 and again in 2019, ocean temperatures in Alaska rose as much as 5 degrees Fahrenheit.

Read the full story at Alaska Public Media

Autonomous Vehicles Help Scientists Estimate Fish Abundance While Protecting Human Health and Safety

June 2, 2020 — The following was released by NOAA Fisheries:

Scientists are capitalizing on existing technological capabilities and partnerships to collect fisheries data. This will help fill the information gap resulting from the cancellation of FY20 ship-based surveys due to the COVID-19 pandemic. NOAA Fisheries plans to use autonomous surface vehicles to collect some critically needed data to support management of the nation’s largest commercial fishery for Alaska pollock.

“Extraordinary times require extraordinary measures,” said Alex De Robertis, NOAA Fisheries fisheries biologist and project lead for the Alaska Fisheries Science Center. “We knew there was a possibility that surveys may be cancelled this year, so we worked on a contingency plan to collect some data just in case. We were able to capitalize on our previous experience working closely with Saildrone and NOAA Research’s Pacific Marine Environmental Laboratory to get things off the ground quickly.”

This effort supports NOAA’s broader strategy to expand the use of emerging science and technologies including unmanned systems, artificial intelligence, and ‘omics to advance ocean research. NOAA released its strategy in February.

“The Alaska Fisheries Science Center has been engaged in research and development efforts to test new technologies to both improve our operating efficiencies and enable us to quickly respond when situations like this arise,” said Robert Foy, Alaska Fisheries Science Center Director. “Providing the best available science to support management decisions is at the heart of our mission to ensure the health of marine ecosystems while supporting sustainable commercial and recreational fisheries and strong local economies.”

Read the full release here

New Modeling Approach Provides Valuable Insights into the Important and Complex Role of Environmental Variables in Juvenile Fish Survival

May 29, 2020 — The following was released by NOAA Fisheries:

Variation in the productivity and sustainability of fish resources is determined, in part, by large changes in juvenile fish production from year to year. This is defined as “recruitment.” Fisheries oceanographers and fish stock assessment scientists have been trying to better understand and predict this variation for more than 100 years.

“We are seeing a lot of changes in the Bering Sea ecosystem. With analytical tools like this, we should be able to quickly identify factors affecting juvenile fish survival in a given year to generate reliable estimates of future productivity. This may help resource managers to more effectively target their management efforts,” said Jim Thorson, Habitat Ecological Processes Research Program Lead, Alaska Fisheries Science Center and lead author for the paper.

For the first time, scientists glimpsed how ocean temperature in different parts of Alaska’s Bering Sea may have influenced juvenile fish survival over the past three decades. They also gained valuable insights into how it may be affected under warmer ocean conditions in the future.

This unique approach combines oceanographic data collected from research surveys (1982-2018) with recruitment data into a single model. It also incorporated end-of-century projections of bottom and sea surface temperatures for the eastern Bering Sea. Scientists then used global climate models to develop regional-scale projections.

The authors see this an important step to understand the complex relationship between fish stock production and long-term climate processes. The ongoing collection of biological and environmental data will help to further improve these predictions.

Read the full release here

Meet Dr. Anne Hollowed, Renowned For Her Work Assessing the Effects of Climate and Ecosystem Change on Fish Stocks

April 13, 2020 — The following was released by NOAA Fisheries:

Dr. Anne Hollowed is a Senior Scientist with the NOAA Fisheries Alaska Fisheries Science Center. She conducts research on the effects of climate and ecosystem change on the current and future status of fish and fisheries. She leads the Status of Stocks and Multispecies Assessment program. Anne currently serves as co-chair of the North Pacific Fishery Management Council’s Scientific and Statistical Committee. She is also an Affiliate Professor with the School of Aquatic and Fishery Sciences at the University of Washington.

We asked Anne to share a little bit about herself, what inspired her to pursue a career in fisheries science and what she would recommend for other young scientists interested in getting into the field.

When did you know you wanted to be a fisheries scientist?

My mother was a chemist and she nurtured my interest in science. I spent my summers in Kansas, at a family retreat. Time spent disconnected from the fast pace of the world allowed me to explore the diversity of nature and animal behavior. By the time I entered college I knew I wanted to pursue a degree in biology. My decision to pursue a career in ocean studies was formed during my semester abroad. I attended Lawrence University, a small liberal arts college in Wisconsin. My professors taught an interdisciplinary course in oceanography that included field work on Andros Island in the Bahamas. It only took one open ocean dive for me to know that I wanted to spend the rest of my career studying the ocean.

Read the full release here

Helping Scientists Protect Beluga Whales with Deep Learning

March 11, 2020 — In the U.S., there are five populations of beluga whales, all in Alaska. Of those five, the Cook Inlet population is the smallest and has declined by about seventy-five percent since 1979. Subsistence hunting contributed to this initial population drop, but this practice was regulated starting in 1999, with the last hunt in 2005. Still, the beluga whale population in Cook Inlet has yet to recover. This population was listed as an endangered species in 2008, with hopes that the population would begin to recover in the near future, but more than a decade later they continue to decline, with a current population estimate of 328 whales.

Like other toothed whales, beluga whales rely highly on sound. They produce acoustic signals to find prey and to communicate; consequently, scientists can use acoustic recordings to study beluga populations and behavior. In 2008, the NOAA (National Oceanographic and Atmospheric Administration) Alaska Fisheries Science Center, in partnership with the Alaska Department of Fish and Game, put together an acoustic research program to continuously monitor beluga whale habitat. This program has two main objectives: (1) studying beluga whale behavior and population size, and (2) understanding the extent to which human-generated noise is disrupting beluga populations.

In the past, with raw audio recordings collected by underwater moorings, NOAA scientists used a very basic detector — based on energy levels in certain frequencies — to detect acoustic signals from beluga whales. This detector was tuned toward high recall, i.e., it was tuned to make sure that it didn’t miss any beluga sounds, but consequently allowed many sounds to pass through that were false positives, i.e. uninteresting background noise. Consequently, manual validation was required for each of those detections. This validation process is very time-consuming and labor-intensive, which limits the number of sensors that the team can deploy, and also limits the speed with which the team can provide answers to critical conservation questions.

Read the full story at Medium

Exploring Women’s Engagement in 30 Years of Alaska Fisheries

February 7, 2020 — The following was released by NOAA Fisheries:

Women play an integral, multifaceted—and until now, largely invisible—role in Alaska fisheries. The first comprehensive study of women’s participation, incorporating gender into 30 years of existing data, shows women participate in Alaska fisheries differently than men.

“Women are really important players in Alaska’s commercial fisheries. They’re key  in contributing to family adaptability and in turn to community resilience,” said Marysia Szymkowiak, the scientist who conducted the Alaska Fisheries Science Center study. “Knowing how women participate directly in fishing and within fishing families and communities is critical to predicting and understanding responses to fishery changes—from individuals, to families, all the way up to communities.”

Historically, fisheries data on participants have not included gender. Such a gender-blind approach limits our understanding of access, mobility, and empowerment issues and can  actually lead to gender biases.

“Not examining fisheries participation for women and men separately implies that there are no differences between them in our fisheries. That’s a flawed assumption with potentially negative social and ecological implications if women and men participate differently—and this research shows that they do,” said Szymkowiak.

Beyond direct participation in the harvesting sector of commercial fishing, women perform many other jobs that are vital to fishing success. Women step in where needed to adapt to changing fishing and family situations. This includes shoreside employment, working on family boats, direct marketing, and engaging in the political process. This essential but “invisible” work is not captured in fisheries statistics.

“We cannot ignore the critical role that gender plays,” Szymkowiak said. “Understanding when, how, and where women fish, and what limits their participation, is essential if we are to maintain and promote community resilience in the face of huge ecological, market, and management changes in our fisheries.”

Read the full release here

Scientists, Fishermen Team Up to Track Cod in Alaska’s Outermost Aleutian Islands

January 9, 2020 — SEAFOOD NEWS — Last winter scientists and Alaskan fishermen agreed to launch a pilot study to develop methods for tagging cod on active commercial fishing vessels in the Aleutian Island.

Satellite tags had never been used on Pacific cod. No one had recorded seasonal movements of cod in the Aleutian Islands. This was the first time industry, scientists, and the fishing community all took part in the research.

Read the full story at Seafood News

The Blob returns: Alaska cod fishery closes for 2020

December 11, 2019 — The Gulf of Alaska’s federal cod fleet is bracing for a complete shutdown in 2020 after an 80 percent TAC cut in 2018 and another 5 percent last year, down to 17,000 tons.

The North Pacific Fishery Management Council announced its decision on Friday, Dec. 6, in response to low recruitment.

“We’re on the knife’s edge of this overfished status,” said Council Member Nicole Kimball, vice president of Alaskan operations for the Pacific Seafood Processors Association.

The fall 2019 stock assessment returned biomass numbers for gulf cod below the necessary threshold as a food source for the endangered Steller sea lion.

The infamous Blob of 2014 — a mass of warm water that hovered in the Gulf of Alaska — likely depleted the cod’s food supply and severely restricted recruitment. The fall 2017 Gulf of Alaska survey yielded historically low numbers at 46,080 metric tons, down more than 80 percent since 2013.

“That warm water was sitting in the gulf for three years starting in 2014, and it was different than other years in that it went really deep and it also lasted throughout the winter,” said Steven Barbeaux with the Alaska Fisheries Science Center in Seattle. “You can deplete the food source pretty rapidly when the entire ecosystem is ramped up in those warm temperatures.”

Read the full story at National Fisherman

Can crab and fish in Alaska adapt to more acidic oceans? Scientists aim to find out.

November 1, 2019 — Researchers are looking for ways that crab and fish in Alaska may be able to adapt to more acidic ocean water.

With carbon dioxide levels rising on the planet, ocean water absorbs some of that CO2 and water becomes more acidic. That change is already impacting a variety of sea creatures.

Members of the Alaska Ocean Acidification Network gave an update to Alaska’s Board of Fisheries and a public presentation on the topic in Anchorage in October. The network is a group of researchers, managers, and stakeholders interested in the looming problem.

“It’s not that there hasn’t been variability in the amount of carbon dioxide. It’s not that this hasn’t happened before,” said Robert Foy, director of NOAA Fisheries Alaska Fisheries Science Center. “It’s the speed at which it is happening during our lifetime and whether or not the animals and plants in the ocean are able to adapt fast enough given the speed at which it’s occurring.”

Read the full story Alaska Public Media