The coral reefs off Tortuga Island in the Gulf of Nicoya are experiencing a remarkable revival, thanks to an innovative coral garden project spearheaded by local institutions and communities. Launched in August 2024, this initiative has made significant strides in restoring ecosystems devastated by both natural and human-induced degradation, offering hope amidst a global coral bleaching crisis.
The project, a collaborative effort led by the State Distance University (UNED) Puntarenas branch, the Nautical Fishing Nucleus of the National Learning Institute (INA), the PROLAB laboratory, and Bay Island Cruises, has transplanted 1,050 coral fragments from June to September 2024, with an additional 300 corals added in early 2025. This builds on earlier efforts, bringing the total volume of cultivated coral to approximately 9,745.51 cm³, a promising indicator of recovery for the region’s coral and fish populations.
The initiative employs advanced coral gardening techniques, including “coral trees” — multi-level frames where coral fragments are suspended — and “clotheslines,” which allow corals to grow in optimal conditions with ample light, oxygenation, and protection from predators. These structures are anchored to the seabed, floating about 5 meters below the surface. Rodolfo Vargas Ugalde, a coral reef gardening specialist at INA’s Nautical Fishing Nucleus, explained that these methods, introduced by INA in 2013, accelerate coral growth, enabling maturity in just one year compared to the natural rate of 2.5 cm annually. “In the Pacific, three coral species adapt well to these structures, thriving under the favorable conditions they provide,” Vargas noted.
The project was born out of necessity following a diagnosis that revealed Tortuga Island’s reefs were completely degraded due to sedimentation, pollution, and overexploitation. “Corals are the tropical forests of the ocean,” Vargas emphasized, highlighting their role as ecosystems that support at least 25% of marine life and 33% of fish diversity, while also driving tourism, a key economic pillar for the region.
Sindy Scafidi, a representative from UNED, underscored the project’s broader impact: “Research in this area allows us to rescue, produce, and multiply corals, contributing to the sustainable development of the region so that these species, a major tourist attraction, are preserved.” The initiative actively involves local communities, fostering a sense of stewardship and ensuring long-term conservation.
This local success story contrasts with a grim global outlook. A recent report by the International Coral Reef Initiative (ICRI) revealed that 84% of the world’s coral reefs have been affected by the most intense bleaching event on record, driven by warming oceans. Since January 2023, 82 countries have reported damage, with the crisis ongoing. In Costa Rica, 77% of coral reef ecosystems face serious threats, primarily from human activities like sedimentation, pollution, and resource overexploitation.
Despite these challenges, the Tortuga Island project demonstrates resilience. By focusing on species suited to the Gulf of Nicoya’s conditions and leveraging innovative cultivation techniques, the initiative is rebuilding reefs that can withstand environmental stressors. The collaboration with Bay Island Cruises has also facilitated logistical support, enabling divers and researchers to access the site efficiently.
The project aligns with broader coral restoration efforts across Costa Rica, such as the Samara Project, which planted 2,000 corals by January and aims for 3,000 by year-end. Together, these initiatives highlight Costa Rica’s commitment to marine conservation, offering a model for other regions grappling with reef degradation.
As global temperatures continue to rise, with oceans absorbing much of the excess heat, experts stress the urgency of combining restoration with climate action. The Tortuga Island coral garden project stands as a ray of hope, proving that targeted, community-driven efforts can revive vital ecosystems even in the face of unprecedented challenges.
