RRFB Carrys Out Successful Coral Spawning Event

RRFB Chief Operating Officer Ernst Noyons checks on mixtures of coral sperm and egg during the fertilization process. (Image credit: RRFB)
In a major success for coral restoration on Bonaire, Reef Renewal Foundation Bonaire (RRFB) observed grooved brain coral spawning on Friday night and collected eggs and sperm from 14 colonies across four sites. From these, the team produced over 236,000 genetically unique coral larvae in a temporary land-based lab setup.

This event comes as a glimmer of hope after two years of unprecedented coral bleaching and SCTLD (Stony Coral Tissue Loss Disease) pushed many coral species to the brink. With fewer healthy colonies remaining—and many now too far apart to reproduce naturally—the chances of fertilization in the wild have dropped dramatically.

Freshly collected bundles of sperm and egg from 14 colonies of grooved brain coral across four sites on Bonaire. (Image credit: RRFB)

“Every spawning event is a critical and unique opportunity to boost the genetic diversity of Bonaire’s declining coral populations,” said Sanne Tuijten, RRFB’s Science Officer. “And with that diversity comes greater resilience.”

Active restoration plays a vital role in reversing coral reef decline, strengthening struggling populations by boosting genetic diversity, and rebuilding abundance. In fact, research shows that young corals produced through this method show a high tolerance to heat stress. RRFB’s breeding results are highly encouraging, showing that vulnerable coral populations still have the capacity to reproduce—and that targeted breeding can greatly amplify year-round restoration efforts and significantly accelerate natural recovery.

Coral larvae glow green under UV light as they settle on star-shaped “seeding units”, a tool used to encourage the settlement of young coral larvae on the reef. (Image credit: RRFB)

This month’s spawning event is the program’s first of the year, with more work planned for endangered species, including pillar, elkhorn, staghorn, and other brain corals. RRFB’s coral breeding program has been developed in close collaboration with SECORE International. It’s made possible with support from Openbaar Lichaam Bonaire (OLB) and the Dutch Ministry of Agriculture, Fisheries, Food Quality, and Nature (LVVN) through the Nos ta Biba di Naturalesa project.

RRFB Science Officer Sanne Tuijten counts coral embryos in petri dishes to estimate fertilization success. (Image credit: RRFB)
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