A 55-foot female fin whale, likely a juvenile and weighing more than 58,000 pounds, stranded in the surf at Cowell Beach in Santa Cruz on Thursday morning and died about two hours later, The Marine Mammal Center reported with its response partners.
The whale was first reported around 8 a.m. Thursday, and marine mammal experts pronounced it dead at about 10:15 a.m., the center said. The Mercury News, citing Long Marine Lab stranding network director Robin Dunkin, reported the same timeline and said experts on the beach believed the animal had suffered a long-term illness over weeks or months, given how emaciated it appeared when it washed up.
City of Santa Cruz crews moved the whale off the beach overnight, allowing a necropsy to be performed. The Marine Mammal Center said the examination took place Friday morning at the city's Resource Recovery Facility, led by experts from UC Santa Cruz's Long Marine Laboratory, the California Academy of Sciences and The Marine Mammal Center. The Los Angeles Times also reported that scientists described the whale as "severely emaciated and exhibited signs of long-term illness," quoting a city release.
The postmortem exam confirmed that the whale was "severely underweight and emaciated, consistent with a prolonged period of poor nutritional condition," the partners said. The underlying cause of death remains undetermined. Researchers collected tissue and other samples for further diagnostic testing, including histopathology, with results expected to take weeks to months.
Fin whales are the second-largest whale species, after blue whales, and are listed as endangered after decades of commercial whaling, the partners and the Los Angeles Times noted, citing NOAA. Ship strikes remain a threat. Santa Cruz Mayor Fred Keeley said in a statement quoted by the Times, "Whales are such a magnificent part of what makes Monterey Bay special, and it's heartbreaking to see one of these incredible animals on our shores in this condition." He thanked marine mammal experts and first responders "working to manage this difficult situation with care and respect."
Cowell Beach had already been closed after the stranding, a fact noted in weekend high-surf coverage as a separate, earlier closure from Saturday's dangerous swell. The Times also reported that Santa Cruz County was dealing with other grim shoreline news, including an E. coli outbreak that closed Capitola Beach earlier in the week.
Officials said the removal and necropsy required close coordination among city crews and the three scientific partners. Additional lab work, they said, will be needed before anyone can say what made a young fin whale so sick that it came ashore already wasted and died in the surf in two hours.