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Washington Couple Sets Example with Whale Carcass "Experiment"

June 12, 2019

NOAA Fisheries seeks others to volunteer waterfront property for whale decomposition.

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The waterfront property that drew Mario Rivera and Stefanie Worwag to the Pacific Northwest about three years ago now has an extra special attraction: the 40-foot carcass of a stranded gray whale.

The whale did not end up on the couple’s rocky beach south of Port Townsend on its own. Rather, marine mammal stranding responders towed it there at the owners’ invitation. The couple volunteers for the Port Townsend Marine Science Center, responding to stranded marine mammals. They decided it would be interesting to see the whale decompose and be recycled back into the marine ecosystem.

“That’s the primary reason we did it,” Rivera said. “How many opportunities do you get to watch something like this happen right out in front of you?”

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A stranding response team measured the whale as part of an examination that found it to be skinny and malnourished, like many other gray whales that have stranded on the West Coast this year. Photo courtesy Mario Rivera.

NOAA Fisheries is seeking other waterfront landowners willing to follow the Washington couple’s example and volunteer their properties for the decomposition of other gray whale carcasses. They have been washing up at an unusual pace this year. About 30 gray whales have stranded in Washington so far in 2019, the most in about 20 years.

Several of the enormous animals have stranded in the inland waters of Puget Sound and the Salish Sea. This has exhausted most of the known locations where they can be left to decompose naturally. NOAA Fisheries works closely with local, state, and other federal agencies to identify suitable sites, but we are seeking additional options this year.

By volunteering sites, landowners can help support the natural processes of the marine environment. Skeletons remaining after decomposition may be used for educational purposes, but must be registered with NOAA Fisheries.

“We’re grateful to Mario and Stefanie for supporting our stranding network and helping us find a location that works for everyone,” said Kristin Wilkinson, Northwest Coordinator for the West Coast Marine Mammal Stranding Network.

NOAA Fisheries has declared the more than 70 gray whale strandings on the West Coast this year an Unusual Mortality Event (UME), prompting a scientific investigation into the cause. Many of the whales have been skinny and malnourished, suggesting some may not have consumed enough food during their last summer feeding season in the Arctic.

The whale decomposing on Rivera’s and Worwag’s beachfront was emaciated, so it fit that pattern. Worwag is a veterinarian and assisted with a necropsy on the animal.

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Landowners Stefanie Worwag and Mario Rivera volunteered their waterfront property south of Port Townsend, Washington, as a site where the whale can decompose. Stefanie Worwag, a veterinarian, assisted with the necropsy of the gray whale. Photo courtesy Mario Rivera.

The gray whale population last estimated at about 27,000 animals remains strong, but an earlier UME in 1999-2000 lasted two years.  Strandings continued throughout that period.

While the UME designation helps provide funding to investigate the gray whale strandings, it does not pay for handling or disposing of carcasses that can weigh up to 40 tons. That is typically the responsibility of landowners where the carcasses end up. In the absence of alternative locations, the stranding network will have little choice but to leave carcasses where they land. This can create local concerns about smell and related impacts.

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The whale first drifted ashore in front of houses north of Port Ludlow, Washington, before a stranding response crew towed it to the site where it will be left to decompose. Photo courtesy Mario Rivera.

The 40-foot male gray whale that Rivera and Worwag agreed to take had first drifted ashore in front of three beachfront homes near Port Ludlow. They understand the reluctance of some homeowners to have a decomposing carcass nearby, but they have found the smell less than they expected.

“Actually, it’s not too bad,” said Rivera, a retired police officer. The stranding network is testing the use of hydrated lime to speed decomposition and mask the smell, but it’s too early to tell if it’s working, he said.

He is not sure how long the whale will take to decompose, but he is interested to find out. The couple has already noticed eagles in the area, possibly scouting for food.

“This is all a big experiment for us,” he said.

Willing landowners should contact Michael Milstein at michael.milstein@noaa.gov or (503) 231-6268.

Understanding Marine Mammal Unusual Mortality Events

Scientists study and investigate unusual mortality events (UME) to understand the health of marine mammal populations. UMEs can serve as indicators of ocean health.

marine mammal unusual mortality events logo

Last updated by West Coast Regional Office on November 12, 2021

Unusual Mortality Event