Stanford University Archives

ROSAMOND NAYLOR: Making blue foods central to global food systems

July 19, 2021 — A friend used to tell me “something’s a-fish” when things were off kilter. Today, the global food system is not just “a-fish”; it’s failing billions of people.

Hunger, malnutrition and obesity coexist in rich and poor countries alike, often in the same town or even in the same home. Diabetes, heart disease, coastal dead zones and other social burdens connected to our food system continue to rise. In recognition of this urgent challenge, the United Nations will hold a global summit in September for government, business, nonprofit organizations and civil society leaders to map a more sustainable, healthy and equitable food system.

Transforming our food system will require a new mind-set and more careful consideration of blue foods — aquatic animals, plants and algae cultivated and captured in freshwater and marine environments.

Until now, the movement to build productive and sustainable food systems has focused on transforming land-based crops and livestock, largely overlooking the critical role that fish and other aquatic foods play in nutrition, livelihoods and ecosystems around the world. That role will increase as food production becomes increasingly vulnerable to climate change.

Read the full story at the Los Angeles Times

Researchers: Gulf Of California Sardine Fishery In Trouble

May 5, 2021 — The gulf’s sardine fishery has collapsed four times in the past 30 years, and researchers in California worry about the future of the sardine industry.

Alfredo Giron of Stanford University and Octavio Aburto of the Scripps Institution of Oceanography looked at how sardines are faring.

The study shows that there are natural boom-bust cycles where the small fish are plentiful and then scarce.

Read the full story at KPBS

Researchers assess aquaculture’s promise and peril

March 25, 2021 — Despite aquaculture’s potential to feed a growing world population while relieving pressure on badly depleted oceans, the industry has been plagued by questions about its environmental impacts.

But over the years, the diverse industry—which ranges from massive open-ocean salmon cages to family farm freshwater tilapia ponds—has made significant strides toward sustainability, according to a new Stanford-led analysis.

The study notes, however, that in order for the global aquaculture sector to deliver on its full promise, more effective oversight measures are needed to help ensure that its environmentally sound systems are economically viable.

The findings, published March 25 in Nature, could help shape how consumers think about the seafood they buy, and inform governance strategies critical to global food and nutrition security.

“As the demand for seafood around the world continues to expand, aquaculture will keep growing,” said study lead author Rosamond Naylor, the William Wrigley Professor of Earth System Science in Stanford’s School of Earth, Energy & Environmental Sciences (Stanford Earth). “If we don’t get it right, we risk the same environmental problems we’ve seen in land-based crop and livestock systems: nutrient pollution, excessive use of antibiotics and habitat change that threatens biodiversity.”

Read the full story at PHYS.org

That Salmon on Your Plate Might Have Been a Vegetarian

March 25, 2021 — Twenty years ago, as farmed salmon and shrimp started spreading in supermarket freezers, came an influential scientific paper that warned of an environmental mess: Fish farms were gobbling up wild fish stocks, spreading disease and causing marine pollution.

This week, some of the same scientists who published that report issued a new paper concluding that fish farming, in many parts of the world, at least, is a whole lot better. The most significant improvement, they said, was that farmed fish were not being fed as much wild fish. They were being fed more plants, like soy.

In short, the paper found, farmed fish like salmon and trout had become mostly vegetarians.

Synthesizing hundreds of research papers carried out over the last 20 years across the global aquaculture industry, the latest study was published on Wednesday in the journal Nature.

Read the full story at The New York Times

Plastic Ingestion By Marine Fish Is A Widespread And Growing Problem

February 12, 2021 — The consumption of plastic by marine animals is an increasingly pervasive problem, with litter turning up in the bellies of wildlife as varied as mammals, birds, turtles and fish. However, according to a research review by ecologists at Stanford University’s Hopkins Marine Station and PhD student Alex McInturf at UC Davis, the problem is impacting species unevenly, with some more susceptible to eating a plastic dinner than others. With billions of people around the world relying on seafood for sustenance and financial security, this research, published Feb 9. in the journal Global Change Biology, warns that there is a growing number of species – including over 200 species of commercial importance – eating plastic.

Matthew Savoca was collecting data on plastic ingestion by seabirds for his PhD when he became interested in uncovering ecological traits linked to increased consumption. Now, as a postdoctoral research fellow at the Hopkins Marine Station, he has conducted one of the most comprehensive analyses of plastic ingestion on fish ever performed.

“Fish are a really good species to track the flow of plastic pollution through marine ecosystems,” said Savoca, who is lead author of the paper. “Now, we are showing the numbers in ways they haven’t been shown before. No previous studies have looked across all of this research for broad patterns and drivers.”

Read the full story at Science Blog

Fish 2.0 to host free workshop for seafood entrepreneurs and investors

March 27, 2019 — Aquaculture entrepreneurs and researchers seeking capital for ventures and technologies supporting sustainable seafood or the marine environment are encouraged to join a Fish 2.0 workshop at the University of North Carolina Wilmington’s Marine Campus on 23-24 April.

The event is part of the Fish 2.0 initiative and established businesses from the US South Atlantic coast (Maryland, DC, Virginia, North and South Carolina, Georgia, and the Atlantic coast of Florida) involved in seafood supply chains, climate resilience technologies, or seafood production, including aquaculture, wild harvesting or trade are eligible to apply at no cost.

“If you know of technologies being commercialised at universities or ventures getting started in your state, please forward this message. We want to help those entrepreneurs meet investors that can fund these important ventures,” say Fish 2.0’s organisers.

Fish 2.0 is a year-long global programme that connects entrepreneurs with business-building resources and a network of investors and innovators that are shaping the future of fisheries, aquaculture, and the marine ecosystem.

Read the full story at The Fish Site

Study maps where tunas, sharks and fishing ships meet

March 26, 2019 — Overfishing is rapidly pushing many of the world’s sharks and tunas toward extinction. The world’s fastest known shark, the shortfin mako, for example, was recently uplisted to endangered on the IUCN Red List, its decline mostly attributed to overfishing.

But researchers are only beginning to figure out where and when people fish them the most. Now, a new study has some answers.

By analyzing the trails of more than 900 fishing vessels and more than 800 sharks and tunas in the northeast Pacific, researchers have identified regions where the two tend to overlap. This information, researchers say, can be used to manage fisheries, especially in the high seas, the swaths of ocean that lie beyond the jurisdiction of individual countries.

“These fish [sharks and tunas] may travel thousands of miles every year, crossing international boundaries and management jurisdictions,” said Timothy White, lead author of the study and a graduate student in biology at Stanford University, California. “In order to sustainably manage them, we need to know where they migrate and where people fish them, but this info is surprisingly difficult to gather for sharks and tunas of the open ocean.”

Read the full story at Mongabay

Melting ice poses fleeting ecological advantage but sustained global threat, Stanford scientist says

August 31, 2018 — From collecting field samples inside the ocean’s frozen ice pack to analyzing satellite images in the comfort of his Stanford office, Kevin Arrigo has been trying to figure out how the world’s rapidly thinning ice impacts polar food chains. Arrigo, a professor of Earth system science at Stanford School of Earth, Energy & Environmental Sciences, found that while melting ice threatens to amplify environmental issues globally, ice sheet retreat can provide much-needed food in local ecosystems.

Through this work, Arrigo discovered that thinning ice at the poles can alleviate polar food deserts by extending phytoplankton blooms. However, the silver lining associated with melting ice cannot make up for imminent threats, such as rising sea levels, associated with unchecked glacial shrinkage.

Arrigo, who is also the Donald and Donald M. Steel Professor in Earth Sciences, spoke with Stanford Report about his work on polar phytoplankton blooms and discussed whether recent news about sea ice breaking up suggests we’ve reached a tipping point.

What have you learned about how glacial melt impacts food chains in the extreme environments of the poles?

It turns out that when glaciers form, they accumulate particles and dust that contain essential nutrients like iron, on which all living things depend for survival. As glaciers melt, they add nutrients to the ocean and fertilize the local ecosystem. In Greenland and Antarctica, the ocean is short on iron, so melting glaciers make up for the lack of iron.

Read the full story at Stanford News

New Tool Helps Fisheries Avoid Protected Species In Near Real Time

June 3, 2018 — New computer-generated daily maps will help fishermen locate the most productive fishing spots in near real time while warning them where they face the greatest risk of entangling sea turtles, marine mammals, and other protected species. Scientists developed the maps, the products of a system called EcoCast, to help reduce accidental catches of protected species in fishing nets.

Funded primarily by NASA with support from NOAA, California Sea Grant, and Stanford University, EcoCast was developed by NOAA Fisheries scientists and academic partners with input from fishermen and managers.

Using the swordfish fishery as an example, EcoCast incorporates data from tagged animals, remote sensing satellites, and fisheries observers to help predict concentrations of target species (broadbill swordfish) and three protected species (leatherback turtle, blue shark and California sea lion).

EcoCast will help fishermen, managers, scientists, and others understand in near real-time where fishing vessels have the highest probability of catching targeted species and where there is risk of catching protected species. In doing so, EcoCast aims to improve the economic and environmental sustainability of fisheries that sometimes inadvertently catch and kill sensitive species.

Read the full story at NOAA Fisheries

Global Fishing Watch responds to Ray Hilborn’s critiques of its study

March 27, 2018 — Global Fishing Watch welcomes Dr. Ray Hilborn’s recent statement in Seafood Source expressing his desire to work together to strengthen our collective insights into commercial fishing activity.

Furthering innovation and collaboration with the scientific community is at the heart of Global Fishing Watch’s mission to advance responsible stewardship of our oceans through increased transparency. Our Research Partners program, an interdisciplinary collaboration with some of the world’s leading marine science institutes, strives to improve fisheries management and science through the sharing of data, new research and cooperation.

Our recent study published in Science was produced with partners at the University of California, University of Santa Barbara, National Geographic Society’s Pristine Seas project, SkyTruth, Dalhousie University, Stanford University, and Google. This research has produced the first-ever dataset of global fishing activities, as captured by satellites using automatic identification system (AIS) positions. Global Fishing Watch’s algorithm processed 22 billion AIS messages to identify more than 70,000 commercial fishing vessels, the sizes of and engine powers of these vessels, what type of fishing they engaged in, and where and when they fished down to the hour and kilometer.

The study and associated maps also depict global fishing activity with an unprecedented resolution – the fishing effort footprint is two to three orders of magnitude higher in spatial and temporal resolution than previous datasets – and reveals that industrial fishing covers more than 55 percent of the ocean’s surface – over four times the area covered by agriculture. This new high-definition global view of fishing would not have been possible without recent advances in computing power, an increase of satellites in orbit, and improved machine learning algorithms.

Importantly, by making all of the data in this study public and freely available, we aim to increase transparency in the commercial fishing industry and improve opportunities for sustainable management and informed decision making. We have also grown the data available within our transparency platform, including adding more AIS data, and through our government and research partners, including vessel monitoring system (VMS) and Visible Infrared Imaging Radiometer Suite (VIIRS) data.

Dr. Hilborn says that vessels monitored for the study were largely tuna boats over 100 feet in length. Technically, these tuna boats are only a fraction of the 70,000 vessels monitored in our study. By far, the vast majority of vessels we observe are Chinese vessels operating in Chinese waters.

For the study, we also only track vessels that have AIS devices, and the fraction of fishing vessels with AIS varies considerably between regions of the ocean. In some regions, such as in Europe, almost all sizeable fishing vessels broadcast their locations. Similarly, in the high seas, we can capture most of the fishing activity, as a high fraction of high seas fishing vessels carry AIS. By contrast, in many developing countries, only a small number do. This fact makes our dataset incomplete, but it is still far more comprehensive than previous global datasets of fishing effort.

Read the full statement from Global Fishing Watch at Seafood Source