Saving Seafood

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

Cardiorespiratory fitness of farmed Atlantic salmon unaffected by virus

March 14, 2019 –The respiratory systems of Atlantic salmon function normally even when carrying large loads of piscine orthoreovirus (PRV), new UBC research has found.

“We didn’t find significant harm to the fish’s respiratory physiology despite the virus replicating to a load equal to, if not higher, than those seen naturally in wild or farmed fish” said Yangfan Zhang, a Ph.D. student in UBC’s faculty of land and food systems and lead author of the study published today in Frontiers in Physiology.

PRV is present in nearly all farmed Atlantic salmon on Canada’s west coast, and various strains of PRV have been detected in many salmonid species around the world. Consequently, the results are a positive step in reducing the uncertainty about the potential of infected farmed Atlantic salmon in marine pens to negatively impact migrating wild Pacific salmon.

Read the full story at Phys.org

Expedition planned to better understand Gulf of Alaska salmon stocks

November 27, 2018 — Richard Beamish, a scientist recently retired from Canada’s Department of Fisheries and Oceans, is planning an expedition across the Gulf of Alaska to better understand changes in salmon stocks.

Beamish, who is being financially supported by fish farm operators, said that scientists do not fully comprehend the rising and falling of wild salmon stocks. Beamish said the contract for the expedition had not yet been signed but that funding for his proposal had been recently secured. Beamish declined to specifically name which salmon farmers were backing the project.

“We still don’t know the mechanisms that allow us to accurately forecast salmon,” Beamish said during an aquaculture industry conference in Campbell River, British Columbia, Canada.

Beamish proposes a group of scientist trawl for salmon in the Gulf of Alaska and take and use DNA samples to determine the salmon’s origin, allowing them to estimate their abundance in the region.

“No one has ever done this in the Gulf of Alaska, where the bulk of our salmon are in the winter,” he said.

Because the study would involve a huge area of ocean which is vital to British Columbia salmon stocks, the project has the support of the Canadian government as well as other governments. Beamish indicated that a teams of scientists from nations including South Korea, Japan, Russia, The United States, and Canada would be involved. A Russian vessel would be used for the survey, at a cost of USD 900,000, (EUR 785,719) he said.

Read the full story at Seafood Source

Want to Protect the Oceans? Empower Women

September 18, 2018 — Picture someone fishing, and a woman probably doesn’t come to mind. Men are the face of fisheries work, even though women are its backbone in much of the world.

Half of seafood workers are female. Women net fish, spear octopus, dig clams, dive for abalone and pack and process seafood, yet are consistently denied a voice in fisheries management.

That’s more than unfair. Excluding women overlooks half the workforce, and all the fish and shellfish they pull out of the water. Ignoring such a sizable chunk of fishing sets communities up to overexploit their resources, according to a 2006 study from the University of British Columbia. It’s a recipe for overfishing and ocean depletion.

In the Tuvalu Islands, for example, a government initiative to restore edible sea snails failed because it only consulted men. Women also harvest the snails, and continued collecting them as usual, unknowingly trouncing the restoration effort.

Female fishers have deep knowledge of the seafoods they catch and the rhythms of the beaches where they work, often passed down matriarchal lines. They have strong incentives to manage natural resources sustainably, experts say, but first they need a seat at the table.

Read the full story at EcoWatch

Could A Ban On Fishing In International Waters Become A Reality?

September 14, 2018 — The jury is in on marine reserves: They work. Research has repeatedly shown that fish numbers quickly climb following well-enforced fishing bans, creating tangible benefits for fishers who work the surrounding waters. In fact, many experts believe fishing will only be sustainable if marine reserves are expanded significantly.

That’s why some activists and scientists are now discussing the idea of creating a marine reserve so big it would cover most of the ocean. Specifically, they want fishing banned in international waters.

Also called the high seas, international waters include all parts of the ocean 200 miles or more from sovereign land. That’s about 58 percent of the ocean’s surface. In this largely unregulated area, fishing boats use voluminous trawl nets, longlines miles in length, and other industrial gear to catch migrating tunas and billfishes, sharks, and seafloor species like toothfish, usually sold as Chilean sea bass.

The environmental impact of these fisheries can be devastating. Deep-sea trawling destroys seafloor habitats, including ancient corals, while killing many creatures that are ultimately discarded. Meanwhile, the total contribution to the world’s food supply from these fisheries is negligible, catch records have shown.

Proponents say a fishing ban could be an effective way to protect depleted species and ultimately create more fish in coastal waters, where fishers could still deploy hooks and nets.

Read the full story at NPR

Study on economics of fishing on the high seas

June 7, 2018 — As much as 54 percent of the high seas fishing industry would be unprofitable at its current scale without large government subsidies, according to a new study by researchers from the National Geographic Society; the University of California, Santa Barbara; Global Fishing Watch; the Sea Around Us project at the University of British Columbia; and the University of Western Australia. The research, published today in the open-access journal Science Advances, found that the global cost of fishing in the high seas ranged between $6.2 billion and $8 billion USD in 2014. Profits from this activity range between a loss of $364 million and a profit of $1.4 billion USD.

The high seas—marine waters beyond national jurisdiction—cover 64 percent of the ocean’s surface and are dominated by a small number of fishing countries, which reap most of the benefits of fishing this internationally shared area. While the environmental impacts of fishing on the high seas are well studied, a high level of secrecy around distant-water fishing had previously precluded reliable estimates of the economic costs and benefits of high seas fishing. However, newly compiled satellite data and machine learning have revealed a far more accurate picture of fishing effort across the globe at the level of individual vessels.

“The reason most fleets continue to operate in the high seas is that they receive government subsidies. Without subsidies and the forced labor some of them are known for, fishing would be unprofitable in over half of the high seas fishing grounds,” said Enric Sala, National Geographic Explorer-in-Residence and lead author of the study.

Using Automatic Identification Systems (AIS) and Vessel Monitoring Systems (VMS), the researchers were able to track the individual behavior, fishing activity and other characteristics of 3,620 vessels in near-real time. Combining this information with the global catch data from the University of British Columbia’s Sea Around Us project, the team was then able to determine how much effort the vessels expended, how large their catch was, and how much profit the catch generated.

Read the full story at PHYS.org

When Big Data meets overfishing

May 11, 2018 — Illegal, unreported and unregulated (IUU) fishing and overfishing deplete fish stocks and cause billions of dollars in losses a year, experts say.

But new technologies offer opportunities to combat IUU, particularly for countries with limited means to patrol their waters or enforce legislation, said the London-based think-tank the Overseas Development Institute (ODI).

Here are some facts about the issue.

– Much of the world’s fish stocks are overfished or fully exploited, the United Nations has said, as fish consumption rose above 20 kilograms per person in 2016 for the first time.

– Global marine catches have declined by 1.2 million tonnes a year since 1996, according to The Sea Around Us, a research initiative involving the University of British Columbia and the University of Western Australia.

 – IUU is not confined to the high seas; it also takes place in exclusive economic zones, and in river and inland fisheries, and is committed by both national and foreign vessels.

– Initiatives to tackle IUU are run by for-profit and non-profit groups, and use satellite, data and other technologies.

Read the full story at Reuters

 

Mistake in fisheries statistics shows false increase in catches

February 7, 2018 — Countries’ improvements to their fisheries statistics have been contributing to the false impression that humanity is getting more and more fish from the ocean when, in reality, global marine catches have been declining on average by around 1.2 million tonnes per year since 1996.

A new study in Marine Policy explains why the reconstructed catch  of the Sea Around Us show declining , while the Food and Agriculture Organization of the United Nations claims that catches have been more or less ‘stable’ since the 1990s. The Sea Around Us is a research initiative at the University of British Columbia and the University of Western Australia.

The problem – say authors Dirk Zeller and Daniel Pauly- occurs as an inadvertent side effect of well-intentioned efforts by countries to improve their national data monitoring and reporting systems. As they include new information, for example of a previously unmonitored or poorly-monitored fishery, region or fleet, these new data add additional catches to those of already monitored sectors, thus creating the impression of a growing trend.

But such upward tendencies in catches do not match reality in most countries because often national statistical systems do not correct their new numbers retroactively. This incidental by-product of updates in fisheries data collection systems is what Zeller and Pauly call a “presentist bias,” which means that the emphasis is on the ‘present’ at the expense of the ‘past.’

“In our paper, we use the example of Mozambique where officials reported that small-scale catches ‘grew’ by 800 per cent from 2003 to 2004. This is incorrect. What happened was that the small-scale sector was massively under-represented in the reported data for the longest time and when a new reporting scheme was put in place in the early 2000s, improved catch data by the always-present subsistence and artisanal fisheries were added. A very similar amount of fish was caught in previous years, it was just not registered in the reported data,” says Zeller, who is the lead author of the study and head of the Sea Around Us – Indian Ocean at the University of Western Australia.

Read the full story at PHYS

 

Climate Change May Shrink the World’s Fish

A new study suggests warming sea temperatures could result in smaller fish sizes.

August 22, 2017 — Warming temperatures and loss of oxygen in the sea will shrink hundreds of fish species—from tunas and groupers to salmon, thresher sharks, haddock and cod—even more than previously thought, a new study concludes.

Because warmer seas speed up their metabolisms, fish, squid and other water-breathing creatures will need to draw more oxygen from the ocean. At the same time, warming seas are already reducing the availability of oxygen in many parts of the sea.

A pair of University of British Columbia scientists argue that since the bodies of fish grow faster than their gills, these animals eventually will reach a point where they can’t get enough oxygen to sustain normal growth.

“What we found was that the body size of fish decreases by 20 to 30 percent for every 1 degree Celsius increase in water temperature,” says author William Cheung, director of science for the university’s Nippon Foundation—Nereus Program.

These changes, the scientists say, will have a profound impact on many marine food webs, upending predator-prey relationships in ways that are hard to predict.

“Lab experiments have shown that it’s always the large species that will become stressed first,” says lead author Daniel Pauly, a professor at the university’s Institute for the Ocean and Fisheries, and principal investigator for the Sea Around Us. “Small species have an advantage, respiration-wise.”

Still, while many scientists applaud the discovery, not all agree that Pauly’s and Cheung’s work supports their dramatic findings. The study was published today in the journal Global Change Biology.

Read the full story at National Geographic

New Study Reveals High Risk of Illegal Seafood Imports Entering Japanese Market

August 1, 2017 — TOKYO, Japan — A new paper published in the journal of Marine Policy estimates that 24–36% of 2.15 million tonnes of wild-seafood imports to Japan in 2015, valued at $1.6 to $2.4 billion, were of illegal or unreported origin.

The investigation, conducted by a team of leading researchers from the University of British Columbia (UBC), assessed 27 seafood products coming from 9 leading source countries to Japan; some products such as imported Chinese eel were found to be up to 45-75% illegally harvested. Although Japan has taken recent steps to address the illegal seafood problem including the ratification of the Port State Measures Agreement, stronger actions must be taken to prevent illegal products from entering one of the world’s largest markets.

The current import control system in Japan—one of the top three seafood markets globally—poses very little deterrent to the entry of illegal seafood. Japan has yet to implement the same anti-IUU and traceability standards as the US and Europe, including a lack of import regulations to verify product legality. Although a limited catch documentation scheme is implemented for Bluefin tuna, Russian crab, and Patagonian Toothfish, as part of Japan’s commitments to Regional Fisheries Management Organizations (RFMO) and other international agreements, such arrangements do not apply to the bulk of its seafood imports.

Read the full story at Ocean Outcomes