Saving Seafood

Thanks to humans, Salish Sea waters are too noisy for resident orcas to hunt successfully

September 11, 2024 — The Salish Sea—the inland coastal waters of Washington and British Columbia—is home to two unique populations of fish-eating orcas, the northern resident and the southern resident orcas. Human activity over much of the 20th century, including reducing salmon runs and capturing orcas for entertainment purposes, decimated their numbers. This century, the northern resident population has steadily grown to more than 300 individuals, but the southern resident population has plateaued at around 75. They remain critically endangered.

New research led by the University of Washington and the National Oceanic and Atmospheric Administration has revealed how underwater noise produced by humans may help explain the southern residents’ plight. In a paper published Sept. 10 in Global Change Biology, the team reports that  pollution—from both large and small vessels—forces northern and southern  orcas to expend more time and energy hunting for fis

Read the full article at PHYS.org

These Vets Make House Calls for Killer Whales

December 27, 2023 —  One day last September, a team of scientists clambered onto a small boat and set out into the Salish Sea, searching for an endangered population of orcas. The Southern Resident killer whales, one of several distinct orca communities that inhabit the Pacific Northwest, can be elusive, so the researchers were delighted to find a small pod of them. But as they drew closer, a putrid smell washed over the boat.

The scientists eyed each other with suspicion before it dawned on them: The odor was coming from the clouds of mist that the whales were expelling from their blowholes. “Everybody is allowed to have bad breath every now and then, but this was not just bad breath,” said Dr. Hendrik Nollens, the vice president of wildlife health for the San Diego Zoo Wildlife Alliance, who was on the boat. “There was something going on.”

Read the full article at the New York Times

Fish farming in WA goes back millennia — how will it survive?

November 29, 2022 — A seed-grading machine whirred obnoxiously as tiny oyster shells shimmied through three levels of screens and were shot out into empty buckets last week.

The contraption separates baby oysters by size, helping seafood workers determine which are ready to be “planted” off Littleneck Beach in Sequim Bay, sold to other shellfish farmers or plunged back into metal buckets full of cool harbor water to grow.

The Jamestown S’Klallam Tribe relies on shellfish for sustenance, said Chair Ron Allen. And they have for millennia — it just didn’t always look like this.

Across the Salish Sea, the Swinomish Indian Tribal Community’s clam garden was tucked within a grayish high tide. Raindrops sent ripples across the water off the shore of Kiket Island.

Traditional cultural ecosystems in the Pacific Northwest have long included forms of aquaculture, like clam gardens, where people create optimal habitat for the mollusks in hopes of boosting productivity. Today, it’s one piece of the complex, ever-evolving picture of fish farming in Washington state. But the commercial finfish farming of today shares little in common with the traditional Indigenous methods that long preceded it.

Read the full article at The Seattle Times

Body Condition of Endangered Killer Whales Reflects Salmon Numbers and Odds of Survival

August 19, 2021 — The following was released by NOAA Fisheries:

The body condition of endangered Southern Resident killer whales reflects changes in Chinook salmon numbers in the Fraser River and the Salish Sea. This is according to new research using aerial photogrammetry from drones to track changes in their body condition over time.

The study, titled “Survival of the Fattest: Linking body condition to prey availability and survivorship of killer whales,” also found that poor body condition makes the whales more likely to die.

The new findings published today in Ecosphere highlight the value of monitoring these endangered whales through aerial photogrammetry. This method can detect individual whales declining in condition, which can provide an early warning system that they may die.

The 74 Southern Resident orcas make up three pods known as J, K, and L. Each pod is made up of distinct social and family groups.

The research showed that the body condition of J pod whales improved when Chinook salmon abundance was higher in the Salish Sea and in Fraser River tributaries. L pod body condition improved when Chinook salmon abundance was higher in Puget Sound tributaries, although that relationship was weaker than J pod and Fraser River Chinook. K pod whales had no clear relationship to the salmon populations examined in the study. However,  whales in K pod also experienced little change in their body condition during the study period.

K and L pods spend more time foraging on the outer coast of Washington and Oregon than J pod. Their more varied diet is more challenging to relate to changes in their body condition. In contrast, J pod depends to a greater extent on Chinook salmon. Differences in body condition between the three pods reflects distinct foraging patterns, while the condition of individual whales provides insights into their health, researchers found.

Read the full release here

Higher Vessel Speeds Offset Salmon Abundance for Endangered Orcas, Reducing Chance of Catching Prey

August 4, 2021 — The following was released by NOAA Fisheries:

Increased abundance of salmon in the inland waters of the Salish Sea increased the odds of endangered Southern Resident killer whales capturing salmon as prey, but increased speeds of nearby boats did just the opposite, according to new research findings.

The research was led by NOAA Fisheries’ Northwest Fisheries Science Center. It found that the orcas descended more slowly, and took longer dives to capture prey, when nearby boats had navigational sonar switched on. The sonar from private and commercial vessels directly overlaps the main sound frequencies the whales use to hunt. This may mask the whales’ signals and force them to expend more energy to catch prey.

“That suggests that it may prolong their effort to dive in search of prey, which like all marine mammals they have to do on a breath hold—so they can stay underwater only so long,” said Marla Holt, research wildlife biologist at the Northwest Fisheries Science Center and lead author of the new research. Researchers used suction-cup tags that record whale movements and sound to track and analyze their behavior and use of sound to hunt.

Earlier research found that the faster nearby vessels traveled, the greater noise the endangered killer whales experienced. That could help explain why higher speeds of nearby vessels were associated with reduced odds of the whales capturing prey. Faster vessels might also seem more unpredictable to the whales, possibly distracting them as they close in on prey, Holt said.

“Consequences of reduced food intake include negative impacts on the whales’ ability to meet their energetic requirements to support key life functions, including growth and reproduction,” the scientists wrote in the new research paper published in the journal Marine Environmental Research.

Read the full release here

Human Population Growth Threatens Endangered Whales

June 4, 2019 — Population growth is threatening efforts to save Southern Resident killer whales, whose decline is not being treated with the urgency the crisis demands, officials said in a task force meeting in Washington state Monday.

The Puget Sound area surrounding the Salish Sea is expected to be home to almost 6 million more people by 2050, which would add between 33 and 150 square miles of paved area, according to the Washington Department of Commerce.

“Population growth is the top challenge for conserving habitat,” Jeff Davis, assistant director of the Washington Department of Fish and Wildlife’s habitat program, said Monday at the Southern Resident Killer Whale Task Force meeting.

Governor Jay Inslee convened the task force last year, asking it to provide recommendations to prevent the endangered whales’ extinction.

Unlike most orca, Southern Residents exclusively eat fish – mostly Chinook salmon, which are also listed under the Endangered Species Act.

Dwindling food, an abundance of ship noise that interferes with the whales’ ability to hear and increasingly toxic waters are factors that have reduced their numbers from a high of 200 to the current low of 76 whales, which are divided into three extended families – also known as pods.

Read the full story at the Courthouse News Service

Learning from gorillas to save killer whales

November 9, 2018 — In 2018, the southern resident killer whale population in the Pacific Northwest’s Salish Sea was at its lowest ever. The world watched in September as an orca named Scarlet, or J50, wasted away and died, leaving just 74 of her kind left. Some wondered if this was “What extinction looks like.”

Meanwhile, endangered mountain gorillas in Africa hit a milestone in the opposite direction. Their population climbed to more than 1,000—the highest in nearly a century.

Building on work begun by primatologist Dian Fossey of Gorillas in the Mist fame, Gorilla Doctors, a program led by the University of California, Davis, has been providing personalized veterinary care to these animals in the wild since the late 2000s. The gorillas have their own long-term health records, and the international team of veterinarians that observe and treat them know each one as they would their own family members and friends—down to the individual.

Read the full story at Phys.org