After more than ten years of negotiations, Peru’s Council of Ministers approved the creation of the Grau Tropical Sea National Reserve — a 115,675-hectare stretch of ocean off the northern departments of Piura and Tumbes that the IUCN ranks among the 70 most important places on Earth for marine biodiversity conservation.
At a glance
- Marine protected area: The new reserve covers just over 115,675 hectares (285,840 acres) of the Grau Sea, protecting a stretch of coastline where two major ocean systems converge.
- Biodiversity hotspot: Humpback whales, manta rays, hammerhead sharks, all species of sea turtles, and dozens of species new to science are found within the reserve’s four sectors.
- Artisanal fishing communities: Of the 35 main fish species landed by Peru’s artisanal fishing fleet, 24 originate from Piura or Tumbes — meaning local fishers have a direct stake in the reserve’s health.
Where two oceans meet
The Grau Sea sits at a rare convergence point. Warm tropical waters from the Eastern Pacific, stretching down from Mexico, meet the cold, nutrient-rich upwellings of the Humboldt Current. That collision of systems creates extraordinary productivity.
Humpback whales come here to give birth. Critically endangered hammerhead sharks patrol the reefs. Corals, anemones, and crustaceans found nowhere else on Earth populate the seafloor. Scientists have described dozens of species new to science from the reserve’s four sectors alone — Punta Sal reefs, Cabo Blanco–El Ñuro, Foca Island, and Máncora Bank.
Máncora Bank, an underwater ravine roughly 250 kilometers long, deserves particular attention. Deep moving currents collide with its submerged slopes and push nutrient-rich water toward the surface, feeding migratory species including whale sharks and sea turtles. It is a kind of underwater crossroads — and one of the least studied parts of the reserve.
A decade in the making
Scientists and artisanal fishers first called for protected status around 2010. The Grau Sea’s richness was well documented, but so were the competing interests: hydrocarbon extraction operations already held rights in the area, and industrial fishing fleets worked its deeper waters.
Those overlapping claims stalled the process for years. Daniel Cáceres, a representative of the Sustainable Ocean Alliance in Latin America, notes that illegal trawling was occurring in the area regularly, with limited oversight. Gaining National Reserve status changes the legal landscape — it creates a framework for monitoring and enforcement that simply did not exist before.
For Peru’s National Service of Natural Protected Areas (SERNANP), the reserve also advances the country’s commitments under international conservation frameworks, including the global 30×30 goal — protecting 30% of marine habitat by 2030.
What the reserve does and doesn’t protect
The approval is a genuine milestone. It is also incomplete, and conservationists are clear-eyed about that.
The Supreme Decree that created the reserve recognizes previously acquired rights — which means industrial fishing, including trawling, will continue in portions of the protected area, particularly on Máncora Bank. Oceana’s science director Juan Carlos Riveros has noted that IUCN directives explicitly state industrial-scale fishing is incompatible with protected area status, because the volumes extracted work against the core purpose of protection.
Maximiliano Bello, an ocean policy expert and executive advisor to Mission Blue, puts it plainly: Peru has used the ocean intensively for decades and benefited greatly from that wealth. What it needs now are genuine no-fishing zones — not a protected designation that preserves the status quo.
Those concerns are real. But the legal framework does require that previously acquired rights be adapted to the reserve’s objectives, not exercised without limit. Silvana Baldovino of the Peruvian Society of Environmental Law explains that all activities within the reserve will face constraints aligned with its conservation purposes. The fight to define those constraints — and enforce them — is now the next chapter.
What comes next
Including the Grau Tropical Sea National Reserve, Peru has now protected less than 10% of its marine territory. The gap between that figure and the 30×30 target is large. Cáceres is direct about what closing it requires: significant funding and international support.
He points to the Dorsal de Nasca National Reserve as a cautionary example. That reserve permits industrial fishing, and international funders have largely declined to invest, questioning what exactly it protects. The Grau reserve faces a similar credibility test.
For artisanal fishing communities in Piura and Tumbes, the stakes are immediate. The waters they have fished for generations are more productive when healthy — and less productive when trawlers and pollution go unchecked. The reserve gives those communities a legal tool they did not have before. Whether it translates into real protection depends on enforcement, funding, and the political will to treat the Grau Sea as the irreplaceable place that science says it is.
Read more
For more on this story, see: Mongabay
For more from Good News for Humankind, see:
- Ghana creates a new marine protected area at Cape Three Points
- Indigenous land rights: 160 million hectares recognized ahead of COP30
- The Good News for Humankind archive on marine conservation
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