Finalized Report on Euthanized Oregon Coast Whale in Nov: Many Diseases

Published 04/06/26 at 5:55 p.m.
By Oregon Coast Beach Connection Staff

(Newport, Oregon) – A range of scientists around the world worked on a problem that originated on the Oregon coast in November, a stranded whale incident that became an incredibly heated argument among members of the public. (Photos OSU)

Now, the hot-button issue should be settled for many, as the final necropsy report for the young humpback whale that stranded near Yachats in November concludes that multiple chronic diseases played a major role in the animal’s decline and eventual beaching. Oregon State University’s Oregon Veterinary Diagnostic Laboratory just released the results.

After consulting with marine mammal pathologists and scientists around the world, lead pathologist Dr. Kurt Williams said the findings point to long-standing health problems that predated the whale’s entanglement and stranding.

“When I look at all the results in the context of what we know about the whale, there are many signs it was having problems long before the stranding,” said Williams, director of the laboratory at OSU’s Gary R. Carlson, MD, College of Veterinary Medicine. “My interpretation of events is that the animal’s pre-existing disease challenges contributed to the whale's entanglement and then to the live stranding.”

The male humpback, estimated to be 1 to 2 years old, was found to have significant chronic disease across multiple organ systems. The report cites evidence of spinal cord disease likely caused by infection, as well as severe, widespread inflammatory disease in the intestine and colon, likely linked to intestinal parasites.

The whale’s stomach and intestines were empty, indicating it had not eaten for weeks. Its fat reserves were minimal, and the necropsy also documented signs of chronic congestive heart failure, along with acute heart failure associated with the stress of stranding. Responders attempting to assist the whale would not have been aware of these underlying conditions.

“Significant chronic disease processes in multiple organ systems likely contributed to the stranding independent of entanglement,” the report said. Latest on Oregon Coast Humpback Whale: Rescue Fails, Euthanized - Officials: stay away from this site in north Yachats

Williams said he hopes the case will help broaden scientific understanding of whale health. “We hope the findings from this case expand our understanding of whale diseases and spur future investigations to understand and improve the health of whales and the oceans around the globe,” the report noted.

Dr. Leigh Torres with the Hatfield Marine Science Center in Newport said the whale was not emaciated like the grays the Oregon and Washington coast has seen lately.

"We don’t know how much the entanglement played in the death," she told Oregon Coast Beach Connection. " It certainly didn’t help and likely impaired the whale in some way."

At the time of the incident, there was a small army that had gathered in the middle of the night at the remote beach on the central Oregon coast. A large group had endangered themselves by trying to push the creature back out to sea (which is also illegal under federal law). One last attempt was made by whale experts from Washington to use a complex pulley system and yank the juvenile back into the waters but it did not work.

As many scientists said then, the animal was too sick to survive much longer. Authorities opted to humanely euthanize the struggling whale.

A microscopic image of tissue from the whale’s lung shows evidence of edema (E) where fluid has leaked out of small blood vessels from blood backing up in the lungs. Increased collagen (C) has formed around pulmonary blood vessels (BV). Photo by Jens Odegaard/Oregon State University.

The fact it had already stranded showed the whale was doomed.

"Typically large whales do not strand unless sick or injured in some way," Torres said.

The online arguments between those who supported the fishing industry, supporters of locals trying to free the whale and factions from out-of-state who were simply viewing from social media was intense. Much of the ire was pointed at scientists trying to assess the situation, and even resulted in releasing personal information online and some threats to media who wrote about the possibility of entanglement from fishing gear.

The Oregon Marine Mammal Stranding Network, coordinated by Oregon State University’s Marine Mammal Institute in Newport, responded to the incident with support from partner agencies. The program covers strandings along the central and southern Oregon coast as part of the West Coast Marine Mammal Stranding Network.

Currently happening: Washington Coast Dealing with Three Dead Gray Whales and How They Died

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