Saving Seafood

Salmon virus has spread from the Atlantic to the Pacific

May 27, 2021 — Wild Chinook salmon are more likely to be infected with Piscine orthoreovirus (PRV) the closer they are to salmon farms. This finding indicates that farms are spreading the virus to wild salmon – a theory that is further supported by the results of a recent genomic analysis.

Dr. Gideon Mordecai is a viral ecologist at the University of British Columbia who led the study.

“Both our genomic and epidemiological methods independently came to the same conclusion, that salmon farms act as a source and amplifier of PRV transmission,” said Dr. Mordecai. “Because separate lines of independent evidence all point to the same answer, we’re confident in our finding.”

In collaboration with researchers from the Strategic Salmon Health Initiative, the UBC team traced the origins of PRV to Atlantic salmon farms in Norway and found that the virus is now widespread across salmon farms in British Columbia.

After sequencing 86 PRV genomes, the researchers estimated that the lineage of the virus that is now present in the Northeast Pacific diverged from the virus in the Atlantic Ocean approximately 30 years ago. This suggests that the introduction of PRV to British Columbia, and the infection of wild Pacific salmon, is a relatively recent phenomenon.

Read the full story at Earth.com

Revealed: seafood fraud happening on a vast global scale

March 15, 2021 — A Guardian Seascape analysis of 44 recent studies of more than 9,000 seafood samples from restaurants, fishmongers and supermarkets in more than 30 countries found that 36% were mislabelled, exposing seafood fraud on a vast global scale.

Many of the studies used relatively new DNA analysis techniques. In one comparison of sales of fish labelled “snapper” by fishmongers, supermarkets and restaurants in Canada, the US, the UK, Singapore, Australia and New Zealand, researchers found mislabelling in about 40% of fish tested. The UK and Canada had the highest rates of mislabelling in that study, at 55%, followed by the US at 38%.

Sometimes the fish were labelled as different species in the same family. In Germany, for example, 48% of tested samples purporting to be king scallops were in fact the less coveted Japanese scallop. Of 130 shark fillets bought from Italian fish markets and fishmongers, researchers found a 45% mislabelling rate, with cheaper and unpopular species of shark standing in for those most prized by Italian consumers.

Other substitutes were of endangered or vulnerable species. In one 2018 study, nearly 70% of samples from across the UK sold as snapper were a different fish, from an astounding 38 different species, including many reef‐dwelling species that are probably threatened by habitat degradation and overfishing.

Read the full story at The Guardian

GHISLAINE LLEWELLYN & VICKY W.Y. LAM: Blue food on the policy menu

February 1, 2021 — Ghislaine Llewellyn is the deputy oceans leader for WWF International, and Vicky W.Y. Lam is a research associate at the University of British Columbia’s Institute for Oceans and Fisheries.

Food and nutrition are enjoying a deserved turn in the spotlight, with at least a dozen high-level meetings this year where food systems are on the table for discussion.

“Blue food” describes fish and other food from the ocean and inland waters. This category spans luxury comestibles like bluefin tuna and humble edible algae such as sea grapes. It contributes to nutritional security, is a source of micronutrients, and can be a shelf-stable, fresh, or frozen source of protein.

Read the full opinion piece at Seafood Source

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

Return of ‘the Blob’ could intensify climate change impacts on Northeast Pacific fisheries

April 22, 2020 — A large marine heatwave would double the rate of the climate change impacts on fisheries species in the northeast Pacific by 2050, says a recently released study by researchers from the University of British Columbia and University of Bern.

In 2013, a large marine heatwave, nicknamed the ‘Blob’, occurred in the northeast Pacific Ocean. From the coast of Alaska to Baja California, the Blob had a significant impact on the  and fisheries in this region; an impact that lasted for several years.

The new study, released in the journal Scientific Reports, combined the latest , ocean and fish modelling approaches to quantify the future impacts of marine heatwaves like the Blob on fish stocks along the west coast of Canada and USA. The resulting models showed that future ‘blobs’ would exacerbate climate change impacts on these important fish stocks, causing them to decrease in biomass and generating shifts in their distribution, which, in turn, would impact the fisheries sectors in this region.

Read the full story at PHYS.org

IUU economic estimates climb as high as USD 50 billion in new study

March 20, 2020 — Illegal, unreported, and unregulated (IUU) fishing has profound effects on the economies and pocketbooks of developing countries, removing billions of dollars worth of fish every year from the legal trading system.

Between 8 and 14 million metric tons of fish are caught illegally every year, according to a new study from the University of British Columbia (UBC). Those fish are worth an estimated USD 9 billion to USD 17 billion (EUR 8 billion to EUR 15 billion).

Read the full story at Seafood Source

What lives, what dies? The role of science in the decision to cull seals to save cod

March 16, 2020 — Atlantic cod on the Grand Banks of Newfoundland supported one of the world’s greatest fisheries for over three centuries. Yet this seemingly inexhaustible resource is in bad shape. Some stocks are now endangered and their survival could depend on removing a key predator, the grey seal.

This raises some difficult questions: How do we determine the value of one species over another, and what is the role of science in this conundrum?

My colleagues and I in the Fisheries Economics Research Unit at the University of British Columbia are fascinated by these questions. As an interdisciplinary group of economists, ecologists and social scientists, we commonly attribute values to animals in different ways. But determining whether to kill one animal to preserve another is less straightforward.

The collapse of the Grand Banks fisheries is considered one of the most significant failures in the history of natural resource management — akin to the ongoing degradation of the Amazon — and casts a long shadow over Canadian fisheries management.

Read the full story at The Conversation

Study: Ocean fish farming in tropics and sub-tropics most impacted by climate change

February 13, 2020 — Diners may soon find more farmed oysters and fewer Atlantic salmon on their plates as climate change warms Canada’s Pacific coast.

In a study published in Global Change Biology, researchers at the University of British Columbia looked at how  could impact 85  of fish and mollusks that are most commonly farmed in seawater. They found that certain species like Atlantic salmon, European seabass and cobia, and certain areas like the tropics and the Arctic, could be particularly vulnerable to the impacts of climate change.

Take Canada’s Pacific coast: by the mid-21st century, the region is projected to lose between 60 to 84 percent of area currently suitable for Atlantic salmon farming under a strong mitigation, low greenhouse gas emissions, and no mitigation, high emissions scenarios, respectively.

In contrast, the region would gain 46 percent more area for Pacific cupped oyster farming under the high emissions scenario by the 2050s, while Norway and Sweden could respectively see gains between 48 and 100 percent in areas suitable for Atlantic salmon farming.

Read the full story at PHYS.org

Study: Technological creep doubles commercial fishing capacity every 35 years, pressuring stocks

November 25, 2019 — A recent study undertaken by researchers from the University of British Columbia’s (UBC) Sea Around Us initiative showed that new technology has allowed commercial fishing fleets to double their fishing capacity every 35 years, which in turn increases the pressure on dwindling fish stocks.

The researchers examined more than 50 studies related to an increase in catching power, and concluded that the introduction of, for example, GPS, fish finders, echo-sounders, and acoustic cameras has led to an average 2 percent yearly increase in vessels’ capacity to capture fish.

Read the full story at Seafood Source

New drone, underwater footage of orcas stuns researchers, gives intimate look at killer whales’ family life

November 6, 2019 — Who knew orcas were so playful, so full of affection, so constantly touching one another?

New footage taken by drone as well as underwater stunned researchers who spent two days with the southern resident orca J pod off the British Columbia coast, including with the newest baby, and more time with northern resident killer whales in B.C.’s Johnstone Strait. The footage taken during three weeks in August and early September was filmed in collaboration with the Hakai Institute, a science research nonprofit.

“It took our breath away,” said Andrew Trites, professor at the Institute for the Oceans and Fisheries Department of Zoology and director of the Marine Mammal Research Unit at the University of British Columbia in Vancouver. Trites is co-lead researcher on a study that over five years is taking a close look at resident killer whales and their prey.

The drone footage was gathered non-invasively, with the camera hundreds of feet above the whales, who did not seem to even know it was there, Trites said. Combined with underwater microphones, tracking devices used to follow adult chinook, and underwater footage, a spectacular new look into orcas and their day-to-day life in the wild is emerging.

The big standout so far is just how much the orcas touch one another, something not as visible from a boat.

Read the full story at The Seattle Times