Saving Seafood

Study finds human-caused North Atlantic right whale deaths are being undercounted

February 25, 2021 — A study co-authored by scientists at the New England Aquarium has found that known deaths of critically endangered North Atlantic right whales represent a fraction of the true death toll. This comes as the death of a calf and recent sightings of entangled right whales off the southeastern United States raise alarm.

The study, published this month in Conservation Science and Practice, analyzed cryptic mortality of right . Cryptic mortality refers to deaths resulting from human activities that do not result in an observed carcass. The study’s authors combined data on whale encounters, , serious injuries, and necropsies from the North Atlantic Right Whale Consortium Identification Database curated by the New England Aquarium with the serious injury and mortality database held by the National Marine Fisheries Service. The scientists concluded that known deaths of the critically  accounted for only 36% of all estimated death from 1990 to 2017.

“Our work has shown that 83% of identified right whales have been entangled one or more times in , and an increasing number of these events result in severe injuries or complex entanglements that the whales initially survive. But we know their health becomes compromised and they eventually succumb and sink upon death,” said Amy Knowlton, senior scientist with the Aquarium’s Anderson Cabot Center for Ocean Life.

Read the full story at PHYS.org

Scientists Have Not Detected A Single Right Whale In The Bay Of Fundy This Year

October 15, 2020 — For the first time in four decades, marine scientists were unable to find any North Atlantic right whales in the Bay of Fundy this year.

“Always we would have a handful, even in recent years. So to have zero is certainly disturbing or frustrating,” says Amy Knowlton, a New England Aquarium whale researcher who has been tracking the endangered species from a base in Lubec every year since the early 1980s.

She says that for decades, anywhere from a 50-150 right whales showed up in the summer and fall to forage. The numbers started to drop off around 2010, as water temperatures in the Bay and Gulf of Maine began to rise at a rapid clip.

“It’s just a reflection of how the ocean is changing with climate change, and their food resource, plankton, they’re not blooming at the same time and in the same areas that they used to, so it’s a reflection that for them and for our oceans things are changing pretty dramatically,” Knowlton says.

Read the full story at Maine Public

In Changing Climate, Endangered Right Whales Find New Feeding Grounds

October 10, 2018 — Amy Knowlton pilots the 29-foot research vessel Nereid out of Lubec harbor and into the waters of the Bay of Fundy, off of easternmost Maine. A scientist with the New England Aquarium’s Anderson Cabot Center for Ocean Life Knowlton points to harbor porpoises chasing fish in the wind-swept waters on a recent morning.

Then something much larger appears off the stern.

“Whale behind us,” Knowlton says, steering closer. “It’s probably a humpback or fin whale, we’ll get a better look.”

It turns out to be two humpback whales — a cool sighting, but not the kind she is after.

Knowlton is hoping to find the endangered North Atlantic right whales that she and her colleagues have been studying in these waters since 1980.

Right whales are large cetaceans, with big heads and no dorsal fins. Researchers used to count as many as 200 foraging here in late summer. But the whales became scarce starting in 2010, and their range shifted dramatically. Many more are now summering hundreds of miles north, off Canadian shores in the Gulf of Saint Lawrence. More than 130 have been spotted there in recent months.

Marianna Hagbloom, a research assistant on Knowlton’s team, surveyed that area in August and said it was nothing like the Bay of Fundy.

“We had days where we were seeing about 50 individuals,” Hagbloom says. “Just right whales popping up left and right. It’s a beautiful thing to see.”

Read the full story at NPR

Can anyone save the North Atlantic right whale?

April 12, 2018 — By the time Mike Lane shoves off the Cohasset docks, it’s past 8 a.m. — practically lunch time for a lobsterman. But it’s early spring, and the South Shore fisheries are mostly closed, so Lane is keeping a somewhat relaxed schedule. Lobsters tend to hole up for the season several miles farther offshore, and Lane would like to be there, fishing his 800 traps. That area also happens to be a feeding area for North Atlantic right whales — one of our planet’s most endangered species. And so, four years ago, the federal government closed these grounds for much of the winter and spring. That means all Lane can do right now is set a few traps in a small area just outside Cohasset Harbor.

Lane knows he won’t catch much there. But he has two small kids and says he can’t afford not to go. He bundles up a couple of times a week and makes the trip, often returning with just a handful of lobsters.

As he motors out on this raw morning, Lane maintains a casual grip on the boat’s wheel, his hands chapped and bare. Standing next to him is Amy Knowlton, a senior scientist at the New England Aquarium. Together, the scientist and lobsterman have been working to study the impact of fishing gear on endangered whales. Their talk is sparse and familiar — about Lane’s mom, who has Alzheimer’s, and whether his dad, a lobsterman who taught his son the ropes, will be able to get out and fish his own traps this year. Their conversation soon turns to whales. “Virginia,” says Lane. He shakes his head. “Another one.”

Read the full story at the Boston Globe

 

Maine: Lobstermen pack meeting concerning right whales, possible gear changes

March 5, 2018 — Lobstermen from all over the state packed the Rockport Room at the Samoset Resort to overflowing Friday to hear about the potential for ropeless fishing and use of break-away lines to help save the endangered right whale.

The panel discussion March 2 at the annual Maine Fishermen’s Forum brought fishermen together with several experts including scientist Mark Baumgartner of Woods Hole Oceanographic Institute, Amy Knowlton of the New England Aquarium and Mike Asaro of NOAA Fisheries.

Right whales are endangered and on the brink of extinction. They are down to about 450 animals worldwide. In 2017 only five new whales were born to the species and 17 died. Scientists say the cause of their deaths is almost always human in origin, either ship strikes or entanglement in fishing gear.

“We have years, not decades to solve this problem,” Baumgartner said.

Knowlton said the increase in deaths of right whales is due in part to the fact that rope has become so much stronger over the years through technological improvements. She advocated using ropes with strength of no more than 1,700 pounds. One way to achieve this is to braid short lengths of weaker line, which she called “sleeves” because they are hollow, into the ropes, used at intervals of every 40 feet. A whale entangled in this gear could break out of it.

Read the full story at VillageSoup