At the Summit 2025 of the Foro Mar de Cortés in Los Cabos, organizers presented results from a Shell Nurse reef deployed in 2022 off San Juan de la Costa, La Paz. The system uses simple, stackable cages filled with recycled mollusk shells. Fish arrived within weeks, according to state reporting, with meaningful jumps in biomass soon after. In two years, monitoring recorded 38 fish species and 205 invertebrates, with more than 24,000 individual organisms counted at the site—numbers consistent with a thriving nursery effect.
Shell Nurse modules address a local problem—shell waste from mollusk fishing—while creating structure on the bare seabed. That matters in the Gulf of California, where much of the bottom lacks natural relief. The design is intentionally simple so fishers can assemble and install units themselves, tying stewardship to livelihoods instead of treating conservation as an outside mandate. Los Cabos marine farm backers say that the community role is core to scaling responsibly.
In Los Cabos, the new project is framed as a “ranch” or farm: clusters of artificial reefs managed as a single area with rules for use, maintenance, and study. The agreement signed this week calls for expanding deployments and formalizing governance so the area functions like a prosperity zone for marine life. Officials and partners describe a near-term push to move from pilot to a network of modules, aiming at a four-figure total over time if early results hold.
The La Paz pilot did not happen in isolation. Baja California Sur has been adding modules across its coast with Japanese cooperation, including a plan for 81 additional artificial reefs as part of a broader restoration push. State bulletins say the goal is more biodiversity, safer fishing grounds, and better carbon capture through benthic communities. Those claims will need continued, transparent monitoring, but they set a benchmark Los Cabos can now try to meet.
Beyond the modules, the region already knows what long-term protection can do. Cabo Pulmo National Park—less than a day’s drive up the peninsula—saw fish biomass rebound by roughly 460% after years of strict protection, becoming a global case study in marine recovery. That success came from patience, rules, and science—elements Los Cabos will need to embed from the start if the “farm” is to deliver durable gains.
The promise is clear: structure brings life back. But not all artificial reefs work, and poorly sited projects can cause harm. Best-practice guidance rooted in Mexico’s own restoration experience stresses rigorous site selection, purpose-built materials, and long-horizon monitoring. Those basics—and clear, public data—separate robust recovery from feel-good infrastructure at the bottom of the sea. ICRI
What comes next for fishers and reefs
Three questions will define this project’s credibility. First, where and how the modules go in. That means current, depth, and seabed checks; avoiding navigation and fishing conflicts; and ensuring designs match local hydrodynamics so structures don’t scour or move during storms. Second, who measures outcomes? Independent survey methods, regular species counts, and open data can confirm whether gains persist or plateau. Third, how fishers are included. The Shell Nurse model envisions fishers as co-builders and stewards—a practical way to align conservation with income instead of against it.
There is momentum to build on. The La Paz site shows that simple modules can kick-start habitat on sterile sand and pull a food web back together. If Los Cabos can replicate that arc—while publishing data, honoring permits, and locking in community roles—the Los Cabos marine farm could become Mexico’s most visible test of reef-based recovery at scale. The science won’t be instant, and the ocean never offers guarantees. But with disciplined execution, this project can move from hopeful headline to living, breathing reef.
