Saving Seafood

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

Scientists Discover Three New Viruses That Infect Endangered Salmon

September 5, 2019 — Scientists from the University of British Columbia, Fisheries and Ocean Canada, and the Pacific Salmon Foundation have discovered three new viruses that infect endangered Chinook and sockeye salmon – including one that was previously thought to only infect mammals.

These fish are considered to be ‘keystone species’ – meaning they have a disproportionately large impact on their ecosystem, making them a high priority for conservation. However, populations of both Chinook and sockeye salmon have been declining in the Pacific Northwest for the last three decades despite increased fishing regulations.

Researchers believe viruses may be part of the cause of the salmon declines. To date, most research on salmon-infecting viruses has focused on the piscine orthoreovirus, or PRV. PRV can cause ‘Heart and Skeletal Muscle Inflammation Disease’ (HSMI) in Atlantic salmon, devastating farmed stocks. However, PRV does not have the same disease-causing effect on Chinook and sockeye salmon.

Read the full story at Forbes

In hot water? Study says warming may reduce sea life by 17%

June 12, 2019 — The world’s oceans will likely lose about one-sixth of their fish and other marine life by the end of the century if climate change continues on its current path, a new study says.

Every 1.8 degrees Fahrenheit that the world’s oceans warm, the total mass of sea animals is projected to drop by 5%, according to a comprehensive computer-based study by an international team of marine biologists. And that does not include effects of fishing.

If the world’s greenhouse gas emissions stay at the present rate, that means a 17% loss of biomass — the total weight of all the marine animal life — by the year 2100, according to Tuesday’s study in the Proceedings of the National Academy of Sciences. But if the world reduces carbon pollution, losses can be limited to only about 5%, the study said.

“We will see a large decrease in the biomass of the oceans,” if the world doesn’t slow climate change, said study co-author William Cheung, a marine ecologist at the University of British Columbia. “There are already changes that have been observed.”

While warmer water is the biggest factor, climate change also produces oceans that are more acidic and have less oxygen, which also harms sea life, Cheung said.

Read the full story at the New Bedford Standard-Times