3D-printed sea lion pelvis could expand marine mammal training: full analysis

A UNLV-led team has built a 3D-printed synthetic California sea lion pelvis that could give marine mammal veterinarians a more practical way to train for blood collection during a period of repeated sea lion stranding events. The model, described in a January 21, 2026, Scientific Reports paper, reproduces both bone and soft tissue around the caudal gluteal region, allowing trainees to practice on a physical model that is meant to look and feel like the real anatomy. UNLV framed the work as a response to the ongoing care demands created by toxic algal bloom-related beachings along the Southern California coast. (nature.com)

The backdrop is a marine mammal system under strain. NOAA Fisheries reported in March 2025 that an early harmful algal bloom off Southern California had sickened hundreds of sea lions and dolphins, with stranding network partners fielding more than 100 calls a day and rescue teams forced into beach triage. NOAA also called 2025 the fourth straight year of bloom activity affecting Southern California marine life, following another major event in 2024. Those outbreaks are driven by domoic acid, a neurotoxin produced by Pseudo-nitzschia, and they’ve increased the pressure on rehabilitation facilities that provide fluids, anti-seizure treatment, monitoring, and repeated diagnostics for salvageable animals. (fisheries.noaa.gov)

That context helps explain why a training phantom matters. In otariids, blood is commonly collected from the caudal gluteal vein, located just lateral to the sacral vertebrae and partway between the femoral trochanter and the base of the tail. Merck notes that marine mammal blood collection can be challenging because of species-specific vascular anatomy and sampling considerations. The Scientific Reports authors say current training often depends heavily on tactile recognition of bony landmarks, a skill that takes time to develop and is difficult to teach consistently without repeated hands-on practice. (merckvetmanual.com)

The UNLV team used CT and MRI datasets supplied by the U.S. Navy Marine Mammal Program, then segmented the anatomy into separate printable layers for skin, blubber, muscle, and bone. According to the paper, the fabrication process yields a scalable phantom that can be produced in roughly three days and resized depending on training goals, printer capacity, and cost constraints. The authors describe the project as a proof of concept for blood collection training, but they also point to broader uses in soft robotics, bioinspired engineering, and eventually implant or device development. (nature.com)

Public commentary so far has come mainly from the research team rather than outside clinicians. Lead author Daniel Fisher said the project is meant to lay groundwork for future procedures and implants, while senior author Kwang J. Kim said the value of the model is in giving surgeons and veterinarians a lifelike structure for procedural training instead of relying on carcasses or cadavers. I didn’t find independent veterinary reaction published yet, which suggests the article is still early in its dissemination cycle. But the rationale aligns with a broader trend in both human and veterinary medicine toward simulation-based training with anatomically realistic phantoms. (unlv.edu)

Why it matters: For veterinary teams, especially those in wildlife rehabilitation, zoological medicine, and marine mammal programs, this is a practical capacity story. During domoic acid events, clinicians need repeatable, low-risk ways to train staff on species-specific procedures before those skills are needed in volume. A realistic sea lion phantom won’t solve staffing shortages or surge capacity on its own, but it could shorten the learning curve for venipuncture, support standardization across institutions, and reduce the need to use deceased animals for teaching. That’s particularly relevant when outbreaks are becoming more frequent and less predictable. (fisheries.noaa.gov)

There’s also a translational angle. The paper emphasizes that the workflow is scalable and adaptable to other anatomies if imaging data are available. That means the real long-term value may be less about one sea lion pelvis and more about establishing a repeatable pipeline for building species-specific training tools in areas where live-animal teaching opportunities are limited, ethically constrained, or operationally risky. That inference is supported by the authors’ discussion of future model libraries, sensor integration, and broader engineering applications. (nature.com)

What to watch: The next milestones are likely to be validation in real training environments, refinement of artificial blood-flow properties, and integration of sensing materials that can give trainees immediate feedback on needle placement. If rehabilitation centers or marine mammal programs begin using the phantom routinely, that would be the clearest sign this moves from an interesting engineering paper to a durable clinical training tool. (nature.com)