Saving Seafood

New global forecasts of marine heatwaves foretell ecological and economic impacts

April 22, 2022 — Researchers have developed global forecasts that can provide up to a year’s notice of marine heatwaves, sudden and pronounced increases in ocean temperatures that can dramatically affect ocean ecosystems.

The forecasts described in the journal Nature could help fishing fleets, ocean managers, and coastal communities anticipate the effects of marine heatwaves. One such heatwave, known as “the Blob,” emerged about 2013 in the northeast Pacific Ocean and persisted through 2016. It led to shifting fish stocks, harmful algal blooms, entanglements of endangered humpback whales, and thousands of starving sea lion pups washing up on beaches.

“We have seen marine heatwaves cause sudden and pronounced changes in ocean ecosystems around the world, and forecasts can help us anticipate what may be coming,” said lead author Michael Jacox, a research scientist at NOAA Fisheries’ Southwest Fisheries Science Center in Monterey, California, and NOAA’s Physical Sciences Laboratory in Boulder, Colorado.

Marine heatwave forecasts will be available online through NOAA’s Physical Sciences Laboratory. The researchers called the forecasts a “key advance toward improved climate adaptation and resilience for marine-dependent communities around the globe.”

Read the full story at ScienceDaily

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

New Study Shows Pacific Cod Eggs are Highly Vulnerable to Changes in Bottom Temperature

February 21, 2020 — The following was released by NOAA Fisheries:

The 2013 to 2016 marine heatwave—known as “The Blob”—is the largest warm anomaly ever recorded in the North Pacific. In the Gulf of Alaska, scientists have connected low numbers of Pacific cod larvae, juveniles, and adults to loss of spawning habitat. This occured during and immediately following the heatwave. Compounding the ecological loss is the significant economic impact on the second most valuable commercial fishery in Alaska. The fishery experienced large reductions in their annual catch limits in 2018 (a 58 percent cut) and a fishery closure in 2020.

“We combined results of laboratory studies, stock assessment model output and survey data to help us better understand what happens to Pacific cod in warm and cold years,” said Benjamin Laurel, NOAA Fisheries biologist and lead researcher for this new study. “We found that the recent three-year heatwave and return to similar conditions in 2019 potentially had the greatest effect on spawning habitat for the years we had available data (1994 to 2019).”

Water temperature is an important component of fish habitat. Temperature influences every stage of a fish’s life. During the first year of life, fish eggs are particularly sensitive to changes in environmental conditions.

Laurel and colleague Lauren Rogers determined that Pacific cod eggs have a narrow optimal range for hatching success, only 3-6º C. This is much narrower than other related species like walleye pollock and Atlantic cod.

“Early life stage distribution and survival may set biogeographic boundaries and limit productive capacity for fish stocks,” added Rogers. “Pacific cod are unique among cod species; they only spawn once in a season and have eggs that adhere to the seafloor. Pacific cod females can actually place their eggs in habitats with temperatures that optimize hatch success. However, during these warm years, it may have been more challenging to find suitable habitat because the warmer water temperatures extended into the ocean depths.”

Read the full release here

A blob of hot water in the Pacific Ocean killed a million seabirds, scientists say

January 16, 2020 — As many as one million seabirds died at sea in less than 12 months in one of the largest mass die-offs in recorded history — and researchers say warm ocean waters are to blame.

The birds, a fish-eating species called the common murre, were severely emaciated and appeared to have died of starvation between the summer of 2015 and the spring of 2016, washing up along North America’s west coast, from California to Alaska.

Now, scientists say they know what caused it: a huge section of warm ocean water in the northeast Pacific Ocean dubbed “the Blob.”

A years-long severe marine heat wave first began in 2013, and intensified during the summer of 2015 due to a powerful weather phenomenon called El Nino, which lasted through 2016.

The heat wave created the Blob — a 1,000-mile (1,600 km) stretch of ocean that was warmed by 3 to 6 degrees Celsius (5.4 to 10.8 Fahrenheit). A high-pressure ridge calmed the ocean waters — meaning heat stays in the water, without storms to help cool it down.

Read the full story at CNN

Marine Heatwave in the Pacific Shrinks from “Blob” in Size, Retreats Farther Offshore

November 11, 2019 — The following was released by NOAA Fisheries:

The vast marine heatwave that spread warm temperatures across the northeast Pacific Ocean late in the summer and fall of 2019 has declined in size and pulled back from the West Coast, possibly reducing its immediate impacts on coastal ecosystems.

It has declined to about half the size and intensity it displayed in August. However scientists caution that the heatwave designated MHW NEP19a remains two to three times the size of Alaska and still retains enormous amounts of heat in the upper layers of ocean. It remains one of the top four or five largest heatwaves on record in the North Pacific in the last 40 years.

“What we are seeing now is a smaller heatwave that is farther offshore, but there is still a very large span of the Pacific Ocean that is much warmer than usual,” said Andrew Leising, a research scientist at NOAA Fisheries’ Southwest Fisheries Science Center (SWFSC) in La Jolla, California. Leising has developed criteria to detect and gauge the size and magnitude of marine heatwaves. “The question is, where does it go from here? That’s what we’re watching now.”

The edge of the heatwave is now about 1,500 kilometers (about 930 miles) from the West Coast, but still envelops much of the Gulf of Alaska. It no longer so closely resembles the enormous earlier marine heatwave known as “the Blob” that affected much of the West Coast through 2014 and 2015, causing reverberations through the food web.

Low salmon returns to many West Coast rivers in the last few years have been linked to the Blob, which reduced the availability of food when the salmon first entered the ocean as juveniles.

Read the full release here

A vast heat wave is endangering sea life in the Pacific Ocean. Is this the wave of the future?

October 17, 2019 — A vast region of unusually warm water has formed in the northeastern Pacific Ocean, and scientists are worried that it could devastate sea life in the area and fuel the formation of harmful algal blooms.

The broad swath of warm water, now known as the Northeast Pacific Marine Heat Wave of 2019, was first detected in early June. Now data from weather satellites and buoys show that it measures six to seven times the size of Alaska, which spans more than 600,000 square miles.

Given its size and location, the marine heat wave rivals a similar one that arose in 2014 and persisted for two years. That heat wave, known simply as “the blob,” occupied roughly the same region of the Pacific and became known for triggering widespread die-offs of marine animals including sea birds and California sea lions.

“The moms were going out to get food, but when they couldn’t find anything, they swam off and the babies were just left dying,” Andrew Leising, an oceanographer at the National Oceanographic and Atmospheric Administration’s Southwest Fisheries Science Center in La Jolla, California, said of the sea lions and their inability to find enough squid and fish to feed on.

Read the full story at NBC News

Marine heat wave dubbed ‘Blob’ resurges in Pacific; mass deaths of sea life feared

September 23, 2019 — Across vast stretches of the Pacific Ocean extending from Hawaii north to the shores of Alaska, and southeast to near California, a new marine heat wave is underway.

This event is widely referred to as ‘‘The Blob Part Two,’’ or just another ‘‘Blob.’’ The first event, which took place from 2014 through 2016, earned that odd moniker based on its bold red appearance on maps of ocean surface temperatures.

The new incarnation already has caused coral bleaching in the Hawaiian islands and may be tied to strandings of marine mammals along the California coast. If it intensifies and seeps into deeper waters, this marine heat wave could favor another drought in California by altering the jet stream flowing across the Pacific.

Read the full story at The Boston Globe

Is ‘The Blob’ back? New marine heat wave threatens Pacific

September 18, 2019 — In the fall of 2014, marine ecologist Jennifer Fisher was stunned when jellyfish and tiny crustaceans typically found in warmer waters filled her nets off the coast of Oregon. The odd catch was just one sign of the arrival of a vast patch of warm water that came to be known as “The Blob”—a massive marine heat wave that lasted 3 years and dramatically disrupted ecosystems and fisheries along North America’s Pacific coast.

Now, with oceanographers warning that a new Blob could be forming in the Pacific Ocean, Fisher is again preparing for strange encounters when she heads out on a research cruise later this month. “This is a very similar situation,” says Fisher, who works at Oregon State University’s Hatfield Marine Science Center in Newport.

This time, however, Fisher and other scientists say they won’t be taken by surprise. They are preparing to more quickly share data on heat wave impacts with each other and with managers who may have to impose new catch limits to protect valuable fisheries. When The Blob arrived 5 years ago, “we didn’t realize the impact” it would have, recalls Toby Garfield, a physical oceanographer with the National Oceanic and Atmospheric Administration’s (NOAA’s) Southwest Fisheries Science Center in San Diego, California. “We’re going to stay ahead of this one.”

Read the full story at Science Magazine

Ocean heatwave known as ‘The Blob’ is warming up the West Coast – and endangering animals

September 11, 2019 — It could be the return of “The Blob” and scientists are worried.

A huge mass of extra warm water extending from Baja California in Mexico all the way to Alaska and the Bering Sea could result in death for many sea lions and salmon, as well as toxic algae blooms that can poison mussels, crabs and other sea life.

When it happened in 2014 it was dubbed “The Blob” and disrupted sea life between Southern California and Alaska. Now it’s back.

The ocean heatwave began to form in June.

“Temperatures are about as warm as have ever been observed in any of these locations. It developed in mid-June and it’s gotten really big really fast,” said Nate Mantua, head of the Landscape Ecology Team at the National Oceanic and Atmospheric Administration’s Southwest Fisheries Science Center in Santa Cruz, California.

Read the full story at USA Today

Scientists see improved ocean conditions for young salmon

March 11, 2019 — Ocean conditions are improving for salmon entering the ocean this year, several years after The Blob, an unusually warm water event that began forming in 2014, scientists announced Friday.

Research surveys in 2018 confirmed tiny animals that stoke the food chain were nice and fatty. Anchovies, an important forage fish, were increasing in number. Sea lion pups were numerous and growing well, and fish-eating sea birds going strong.

However, subsurface sea temperatures were still warmer than average in some areas. Pyrosomes, a warm-water animal that is not supposed to be in Northwest waters, were still numerous.

Forecasts for chinook salmon in 2019 also were for below-average salmon returns to the Columbia River. Extensive ocean acidification and poorly oxygenated waters off both Washington and Oregon also were predicted for this year.

Read the full story from The Seattle Times at The Spokesman-Review