The perverse arithmetic of coral reef recovery
Coral reefs could sustainably yield 9,000 additional meals per square kilometer — but only if communities dependent on fishing accept decades of reduced catch. A stark example of governance as temporal negotiation.
Coral reef fisheries could produce enough fish to feed millions in malnourished regions, according to research published in PNAS that modeled 2,000 reef sites worldwide. The arithmetic is stark: properly managed reefs could yield 9,000 additional meals per square kilometer. In Indonesia alone, 1.4 million people could meet recommended fish consumption levels. In the Philippines, 800,000. In Tanzania, over 500,000.
But the path from potential to reality reveals governance as a temporal dilemma that must be felt, not merely calculated. To reach sustainable yields, overfished reefs — where biomass now averages 32% below what could exist at maximum sustainable harvest — need 6 to 70 years of reduced fishing pressure. In Kenya, Mauritius, and Oman, some reefs retain less than 10% of their baseline biomass. “To reduce fishing pressure for more fish protein in the long term, we need ways to make up for nutritional shortfalls in the short term,” notes ecologist Sean Connolly of the Smithsonian Tropical Research Institute. “That’s the biggest challenge.”
The study used 150 unfished sites as baselines and applied a widely-used threshold: fisheries should not reduce biomass below 50% of pristine levels. What emerges is not a technical problem but a distributive one across time — asking communities with no margin to sacrifice now for a future they may not live to see. The researchers don’t propose specific reforms, acknowledging that reduced fishing must pair with alternative food production, imported food, or other protein sources. In small island nations with limited arable land, such options may not exist. Climate change compounds the challenge: marine heatwaves threaten most of the world’s coral even as restoration efforts begin.
This is governance as negotiation between generations, between immediate need and future capacity — precisely the kind of temporal distribution that formal institutions struggle to enact but communities must somehow navigate. The 9,000 meals per square kilometer are real. So is the hunger between now and then.