Marine Protected Areas — Why They Work
Quick Fact
Well-managed Marine Protected Areas can increase fish biomass by up to 600% — and the benefits spill over into surrounding unprotected waters.
About This Species
Marine Protected Areas (MPAs) are designated zones where human activities — fishing, mining, development — are restricted or prohibited to allow marine ecosystems to recover. Well-managed MPAs can increase fish biomass by up to 600% within their boundaries, with spillover benefits for surrounding fisheries. Currently, only about 8% of the world's oceans are protected, and a fraction of that is fully protected. The global target is 30% protection by 2030 — the so-called '30x30' goal.
Why It Matters
MPAs are among the most cost-effective conservation investments available. Protecting 30% of the ocean by 2030 could safeguard biodiversity, support fisheries, and help the ocean absorb carbon — but only with genuine enforcement.
Transcript
We've agreed, as a global community, to protect 30% of the world's oceans by 2030. It's called the 30x30 target. And it's one of the most important conservation commitments ever made. But here's where we are right now: only about 8% of the ocean is protected. And a fraction of that is fully protected — meaning no fishing, no mining, no extraction of any kind. The science on Marine Protected Areas is unambiguous. Well-managed, fully protected MPAs work. Fish biomass inside them can increase by up to 600%. Species diversity recovers. Coral cover increases. And the benefits spill over into surrounding unprotected waters — fish populations grow large enough that they naturally expand beyond the MPA boundaries, benefiting fisheries outside. MPAs also protect carbon stores — seagrass meadows, mangroves, and deep-sea sediments that, if disturbed, release enormous quantities of stored carbon. The problem is enforcement. A protected area on paper that isn't monitored or enforced is called a paper park. And the ocean is full of them. Illegal fishing inside MPAs is widespread. Without patrol vessels, satellite monitoring, and genuine political will, protection means nothing. The 30x30 target is achievable. The science tells us exactly where to protect — the areas of highest biodiversity, the critical spawning grounds, the migration corridors. What's needed is the political courage to do it. And the funding to enforce it. The ocean can recover. It just needs the chance.