Saving Seafood

ALASKA: Seafood Bycatch Donation Relieves Hunger and Reduces Waste

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

Fishermen sometimes unintentionally catch fish they do not want or cannot keep. This is called bycatch. While these fish are returned to the sea, many of them do not survive. This is a major problem worldwide—nearly 10 percent of global fishery catches are discarded each year

This waste of valuable seafood protein has been an increasing focus of management, industry, and public concern due to its ecological and economic impacts. That’s where our innovative donation program comes in.

Alaska fishermen occasionally catch Pacific halibut and salmon incidentally in trawls targeting groundfish. Because halibut and salmon are valuable targets of other fisheries, they are designated as prohibited species. Groundfish trawlers are not allowed to retain or sell them. Historically, all prohibited species caught in Alaska were discarded at sea to avoid any incentive to catch these species.

The North Pacific Fishery Management Council and the Alaska seafood industry have a long history of cooperative efforts to reduce bycatch. However, even after bycatch has been eliminated to the extent practicable, some is inevitable.

In 1996, NOAA Fisheries and the North Pacific Fishery Management Council established the Prohibited Species Donation Program. It takes a unique approach to the problem of discarded fish by making it possible for fishermen to donate some bycatch to hunger relief organizations. It simultaneously reduces waste, provides high quality seafood protein to people in need, and avoids incentives to catch prohibited species.

“Bycatch donation is an example of thinking outside the box. When we think about reducing waste, it is usually about avoiding bycatch. This program is a creative solution to maximize the value of the bycatch that can’t be avoided,”  said Jordan Watson, NOAA Fisheries biologist at the Alaska Fisheries Science Center.

Read the full release here

Wind Influences Pollock Success in the Gulf of Alaska

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

For young Alaska pollock in the Gulf of Alaska, survival may depend on which way the wind blows.

A study conclusively shows for the first time that year-to-year variation in the geographic distribution of juvenile pollock in the Gulf of Alaska is driven by wind. Depending on wind direction, water movement may retain juvenile fish in favorable nursery habitats, or transport them away. Young fish that are transported to less favorable habitats are less likely to contribute to year-class strength— the abundance of adults available to the valuable Gulf of Alaska pollock fishery.

For NOAA Fisheries biologist Matt Wilson of the Alaska Fisheries Science Center, the new study addressed a longstanding question.

“When we began this research, scientists thought that lots of juvenile fish would mean a relatively strong adult year-class. But in some years our surveys found a lot of juvenile pollock, followed by a weak year class. In other years a high number of juveniles grew into a strong year class,” Wilson said. “We undertook this research to better understand why large numbers of juveniles do not always translate into a high abundance of adults.”

Wilson and co-author Ned Laman also observed that the geographic distribution of juveniles was highly variable from year to year. In some summers, a very large proportion of the juvenile population was far southwest of the main spawning grounds.

“In this study we asked: what is the cause and consequence of year-to-year geographic variability in the distribution of juvenile pollock in the Gulf of Alaska?” Wilson said.

Read the full release here

Pink Salmon May Benefit as Pacific Arctic Warms

September 1, 2020 — The following was released by NOAA Fisheries:

The Pacific Arctic is undergoing a rapid transformation. As temperatures rise and sea ice melts, some species will do better than others. A new study suggests that pink salmon may be one of those species.

“Our results suggest that warming is both increasing freshwater habitat and improving early marine survival of pink salmon in the northern Bering Sea,” said Ed Farley, NOAA Fisheries biologist at the Alaska Fisheries Science Center, who led the study.

The study provides insight into the response of pink salmon to climate change. The findings are valuable information for commercial and subsistence fisheries, and fishing communities, preparing for future changes.

“Subsistence harvesters would like to know what foods may be available to them now and into the future,” Farley said.

“The importance of fish in Arctic subsistence economies cannot be overstated; they are some of the most commonly eaten foods,” said coauthor Todd Sformo, biologist at the North Slope Borough Department of Wildlife Management.

“In the past on the North Slope, salmon have been used for dog food and even considered nuisance fish when interfering with preferred species such as aanaakliq or broad whitefish in the inland rivers. Recently, there seems to be a change both qualitatively and quantitatively in the use of salmon as a main dish and for smoking.

“Participating in this study allowed me to present a subsistence perspective, learn how fellow researchers measure production dynamics, and better understand how pink salmon are responding to climate warming in the northern Bering Sea. While this research is further south than the waters surrounding the North Slope, it is a beginning of our attempt to account for potential change in subsistence fishing.”

Read the full release here

Fishing Families and Women in Alaska’s Fisheries

August 24, 2020 — The following was released by NOAA Fisheries:

Over recent decades, Alaska’s fisheries have undergone many regulatory, environmental, social, and economic changes, which have differentially affected dynamics in fishing families. Researchers from the Alaska Fisheries Science Center explored these changes and their effects on fishing families in a series of focus groups held throughout Gulf of Alaska fishing communities in 2017 and 2018. These focus groups covered three topics examining family roles and gender division of labor; impacts of management, environmental, economic and social conditions on these roles; and, the future of fishing families and women in Alaska’s fisheries. The research demonstrates the integral work of women in fishing families and their dynamic roles in Alaska’s fisheries more broadly. It further showcases how fishing families have, and continue to, adapt to multifaceted conditions in Alaska’s fisheries. This research has resulted in several scientific journal publications and web stories (which are available below), and is an ongoing effort to document novel conditions, adaptations, and resilience.

Thanks to Sarah Marrinan, North Pacific Fishery Management Council staff, for help with conducting these focus groups.

Read the full release here

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.” 

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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