Sea Otter Awareness Week

Rescued sea otter pup shows challenges single sea otter moms and pups face in the wild

a sea otter on a beach in shallow water.

Southern sea otter 918, named “Earle” by the Oregon Coast Aquarium, was found as a stranded pup at Asilomar State Marine Reserve in Pacific Grove, California. Photo courtesy of the Oregon Coast Aquarium


By Oregon Coast Aquarium, Turtles Fly Too, Monterey Bay Aquarium and the U.S. Fish and Wildlife Service
September 21, 2021

A stranded southern sea otter pup found at Asilomar State Marine Reserve in Pacific Grove, California this May has found a new permanent home at Oregon Coast Aquarium. The young pup was cold and lethargic, and his mother could not be located.

two sea otter eating.

Sea otter mom and pup feed on a brittle star and purple sea urchin. Pup rearing and provisioning impose high energetic costs on females, requiring them to increase foraging effort during this period and leaving them highly susceptible to stressors, including human disturbance. Photo courtesy of Joan Tisdale/Sea Otter Savvy

“A sea otter pup’s mother is the sole caregiver for the first six months of life, which can take a toll on a single parent,” said Lilian Carswell, southern sea otter recovery and marine conservation coordinator for the U.S. Fish and Wildlife Service. “Feeding and caring for a pup can deplete the mother’s energy resources.”

While the cause of Southern Sea Otter 918’s stranding is unknown, at just three weeks old and weighing about 6.5 pounds, the pup would have been unable to survive on his own.

The young pup was taken to Monterey Bay Aquarium where he received treatment and ongoing care. While surrogate sea otter mothers have been used to rear and prepare stranded pups for eventual release to the wild, there were no surrogates available to care for the pup at the time. As such, he was deemed non-releasable by the Service.

Once it was determined that the Oregon Coast Aquarium would be 918’s new home, Turtles Fly Too volunteered to transport the precious cargo from California to Oregon. Turtles Fly Too coordinates the use of general aviation to transport endangered species and critical response teams and to educate the community on marine life conservation.

an airplane.

“Turtle Flier” Peter T. Lewis, who hails from Santa Barbara, California, contributed his time, talent and Daher TBM 700 aircraft to fly the pup to his new home. Photo courtesy of Turtles Fly Too

“We specialize in transporting endangered species, yet [this otter] challenged us with lower temperature needs, medical team support during the flight and securing a high-speed aircraft to reduce the risk for our special passenger,” said Leslie Weinstein, President of Turtles Fly Too.

“Safe transport of the pup from California to Oregon would not have been possible without the donation of time and talent from Turtles Fly Too,” Carswell said. “This transport is making room for the next stranded pup that comes into Monterey Bay Aquarium, potentially freeing personnel to care for a pup that has a chance to be released.”

Oregon Coast Aquarium’s Curator of Marine Mammals Brittany Blades, along with Willamette Veterinary Hospital’s Dr. Dan Lewer, assisted in the transport of 918 from California to Oregon. They closely monitored his health and took measures to make the flight as comfortable as possible for the pup.

a sea otter being dried with a towl.

Southern sea otter 918 is groomed by a mammologist upon arrival at his new home in Oregon. Photo courtesy of Oregon Coast Aquarium

“We are so excited to welcome Earle [SSO 918] to the Aquarium,” said Blades. 918 was named Earle after oceanographer and explorer Sylvia Earle. “Earle will act as an ambassador for his species, connecting guests with ocean life and inspiring conservation. That connection is crucial to the protection and preservation of sea otters and other endangered species.” Watch Earle live at the Oregon Coast Aquarium.

two sea otters in water.

Sea otter mom and pup groom in coastal California waters. Sea otters keep important elements of nearshore marine ecosystems, like kelp forests and seagrass beds, thriving. Photo courtesy of Joan Tisdale/Sea Otter Savvy

Southern sea otters are protected by the federal Endangered Species Act, Marine Mammal Protection Act and California law. Hunted to near extinction, they have since returned to West Coast waters; however, they continue to face serious threats, from bites by great white sharks to changing ocean conditions as a result of climate change.

“Southern sea otters are essentially at carrying capacity based on available food supplies in the central portion of their mainland range, and they continue to face high levels of shark-bite mortality in the northern and southern peripheries,” Carswell said. “That’s hemming them in to a small area that’s just a fraction of their historical range.”

In California alone, the carrying capacity—the maximum number of sea otters the habitat is able to support—is about 17,000. Today the southern sea otter population hovers around 3,000, up from around 50 in the early 1900s. Scientists say expanding their range is a key component for their recovery, as well as for the restoration of coastal ecosystems.

Sea otters keep important elements of nearshore marine ecosystems, like kelp forests and seagrass beds, thriving. Kelp and seagrass provide habitat for thousands of other species. They also capture carbon dioxide from the atmosphere and store it where it can't contribute to climate change. Sea otters help maintain kelp by preying on sea urchins, which can clear-cut kelp forests when left unchecked. And they enhance the resilience of seagrass by consuming crabs, which prey on the surface grazers—like sea slugs—that clean fouling organisms off the seagrass blades.

mulitple kayakers on water looking a multiple sea otters.

Kayakers observe sea otters from a safe distance along the central California coast. Kayakers should avoid disturbing resting sea otters by keeping a sufficient distance (at least 60 feet away is recommended), passing by parallel to the sea otters rather than pointing directly at them and moving slowly, but steadily past them. Photo by Lilian Carswell/USFWS

Because they live and feed along shorelines, southern sea otters can also help humans detect pollutants and pathogens washed down from coastlands.

“SSO 918 will help make people aware of the challenges that face southern sea otters in the wild and the critical role they play in the marine environment along the West Coast,” Carswell said.