Defenders of Wildlife and numerous partners are working toward a sea otter reintroduction to expand the animal’s currently limited range and restore its role as a keystone species in degraded coastal habitats. As part of this effort, we are exploring the ethics of reintroducing these animals to ensure their greatest chance of individual release success and survival.
Defenders’ California Representative Andy Johnson is part of a team of long-time sea otter experts taking a keen look at these ethical aspects. The team includes state and federal agency biologists, aquarium caregivers and veterinarians, specialists from environmental nonprofits and an academic mentor. This complex enterprise must also consider the social, cultural, economic and ethical implications of a sea otter reintroduction program for coastal Tribes, commercial and recreational fisheries and coastal communities.
Learn more about what it means to reintroduce a species ethically and why this is important in this Q&A with Andy.
What have past sea otter reintroductions looked like?
Past programs from the 1960s through the 1980s reestablished sea otter populations in Southeast Alaska, British Columbia, Washington and San Nicolas Island, California. These programs were all translocations, meaning program personnel moved large numbers of otters from existing isolated populations to areas where fur traders had hunted them to extinction.
The managers of these programs focused on how to transport and care for the animals, but they never formally assessed the ethical implications of subjecting sea otters to the disruption, stress, suffering and possible death that might accompany capture and relocation to unfamiliar areas. A pattern emerged with these translocations as a result: large numbers of sea otters were released over short periods and few survived at the new locations.
A more recent reintroduction project involved the Monterey Bay Aquarium’s 15-year-long program to release juvenile southern sea otters who were stranded as orphaned pups and raised by surrogate mothers. About 75% of the released animals survived to independence in Elkhorn Slough, an estuary extending inland from Monterey Bay, and integrated into a small established population. These sea otters went on to reproduce and fulfill their keystone role.
These results give us confidence that we can accomplish an ethical reintroduction elsewhere and reestablish sea otters in areas where they have remained absent since the 1800s.
How do you determine if a reintroduction or translocation is ethical?
An ethical inquiry asks a simple question: is the action right or wrong and how much harm does it do?
To consider a sea otter reintroduction ethical, we have to discuss: Will the proposed action cause adverse consequences for individual animals? Will the potential to cause stress, suffering and death exceed the potential positive outcomes?
An ethical reintroduction would necessarily have to employ measures to minimize and mitigate these harms. Given the life-and-death consequences of wildlife reintroduction programs, discussing how to reduce negative outcomes and improve survival has remained at the forefront of the ethics group’s agenda.
Our ethics team has spent two years addressing the ethical aspects of releasing sea otters into historical coastal regions. We have examined ways to reduce negative consequences and improve survival. For example, we believe releasing small numbers of sea otters over an extended period with intensive monitoring will yield higher survival rates and fewer adverse impacts.
What would an ethical sea otter reintroduction look like?
We will use the Monterey Bay Aquarium’s surrogacy program as a model for an ethical reintroduction framework. To improve animal welfare outcomes and programmatic results we must:
- Refine transportation protocols to reduce stress levels for each sea otter;
- Devote more resources to post-release monitoring using new tracking technologies;
- Increase the time tracking teams spend monitoring and collecting data on released sea otters; and
- Ensure rapid response staff can recapture and care for any sea otters who do not demonstrate adequate survival behavior.
These enhancements, and many others, will help define an ethical sea otter reintroduction program.
What hurdles do you anticipate?
Reintroducing wildlife is not a simple exercise, and it has taken time to understand the nuances of an ethical inquiry and develop the framework for our ethical discussions.
Our biggest hurdle so far has stemmed from weighing the cost to individual animal welfare — stress from capture, complications during transportation and release, failure of released animals to find sufficient food, or early death — against the potential benefits to the ecosystem and the southern sea otter population as a whole. That’s why we have placed such a high emphasis on ethics. A reintroduction program grounded in ethics will surmount these hurdles and achieve a more successful reintroduction.
Another hurdle stems from how the current administration has limited what government agencies can do to protect key habitats and help recover wildlife under the Endangered Species Act, which lists the southern sea otter as threatened. We have organized teams of experts to address the scientific and logistical elements of a sea otter reintroduction, but we still must follow formal federal procedures that could impose delays and unforeseen roadblocks.
Why is this important to you, Andy?
I have worked on the care and conservation of sea otters for more than 40 years. The southern sea otter population made a remarkable comeback from virtual extinction throughout the 20th century. Over the past 25 years, however, the population has neither increased nor expanded its range enough to achieve true recovery under the ESA.
I believe reintroducing southern sea otters to their historical habitat in Northern California will allow the population to recover and help restore damaged nearshore habitats. I would be very pleased to see this happen in my lifetime.
Where can people learn more about this work and other reintroduction efforts?
Defenders and Sea Otter Savvy will host a presentation about the ethics of sea otter reintroduction on Saturday, September 26, at 3 p.m. ET/noon PT! You can also learn more about California’s sea otters and their valuable role as a resilient and vital species at multiple in-person and virtual events throughout Sea Otter Awareness Week 2026.
Any final thoughts?
Like all the world’s wildlife, sea otters possess a worth and significance independent of their value to people or the environment. But they also contribute immense value to nearshore habitats through their keystone predator activities. The biodiversity and resilience of ocean systems benefit from them. And they help promote the economies of shared-shore communities.
I also find solace in the idea that a sea otter reintroduction program could help right some wrongs caused by a human history of unconstrained hunting and environmental degradation. So, let’s proceed with the goal of giving each sea otter our best effort.
Author
Andrew Johnson
