Cambodia's coastal waters are bouncing back—at least in one corner where fishers and conservationists decided to try something straightforward: blocking the boats that destroy everything.
A new seafloor survey spanning 62,146 hectares across the Gulf of Thailand has mapped what's working and what's not. Researchers from Marine Conservation Cambodia documented seagrass beds, coral, shellfish, and sediment type across four zones, sending divers down every 250 meters and using aerial photos in shallower waters where boats couldn't navigate. The result is the first detailed picture of what lives on Cambodia's seafloor—and proof that you don't need expensive technology to fix it.
What the data revealed
The numbers tell a sobering story. Seagrass cover in Kampot province dropped 39% between 2013 and 2023. Destructive trawling—boats dragging weighted nets across the seafloor—is the immediate culprit, though warming seas and sediment from new ports and economic zones pile on the pressure. For fishing communities in Kep, this matters viscerally. Seagrass meadows are nurseries for fish and shellfish. When they disappear, so do the catches that feed families.
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The study, published in Frontiers in Marine Science, was a partnership between Marine Conservation Cambodia, Cambodian authorities, and the fishing communities themselves. That matters. The people whose livelihoods depend on healthy waters weren't consulted after the fact—they were part of designing the solution from the start.
Seagrass recovery doesn't happen overnight. But the survey shows it's possible without waiting for global agreements or massive funding. A few thousand dollars in concrete blocks, combined with enforcement that keeps trawlers out, can reverse a decade of decline. That's the kind of practical progress that keeps communities invested in conservation rather than resigned to loss.
