Puerto Azul Expands Coral Nursery Amid Bleaching Fears

The Bah??a Verde Marine Cooperative announced this week that it will triple the number of underwater planting frames anchored off Costa Mar's central reef shelf, bringing the total to roughly 1,200 frames by the end of the rainy season. The expansion follows a federal grant of 340,000 zandor from the Ministry of Coastal Resilience in Meridian, matched by a regional allocation from the Costa Mar Environmental Fund. It is the largest single investment in the nursery program since its founding eleven years ago.

The timing is deliberate. Oceanographers at the Instituto de Ciencias Marinas in Puerto Azul recorded mean surface temperatures of 29.4 degrees Celsius across the central reef shelf last month, a reading that sits just below the bleaching threshold for the dominant Acropora and Orbicella species that anchor the ecosystem. A similar warm anomaly last May preceded a bleaching event that damaged an estimated 18 percent of monitored reef area before cooler upwellings arrived in August.

Cooperative director Lena Fuentes said the nursery expansion is not a substitute for reducing the thermal stress that drives bleaching, but it does shorten the recovery window when damage occurs. Fragments grown in the nursery frames reach transplant size in eight to fourteen months, compared with the three to five years required for natural recruitment on a healthy reef. The cooperative currently maintains about 40,000 live coral fragments across its existing network, and the expanded program is projected to hold 120,000 fragments at peak capacity.

What remains unresolved is whether the transplanted corals carry enough genetic diversity to withstand conditions that are, by most projections, only going to intensify. A study submitted last month to the Zandoria Journal of Marine Science raises pointed questions about the cooperative's sourcing strategy ??? and its lead author will speak to the Herald this week.