Bringing Back the Zebra Shark: Indonesia’s Groundbreaking Rewilding Effort

In the turquoise waters of Raja Ampat, Indonesia, a bold conservation experiment is rewriting the rules of marine recovery. For the first time in history, scientists and conservationists are attempting to “rewild” an endangered shark species, moving beyond simple protection to actively restoring populations that have all but vanished from their native reefs.

What is the ReShark Project?

The StAR (Stegostoma tigrinum Augmentation and Recovery) project, better known as ReShark, is the world’s first rewilding program dedicated to endangered sharks. Its primary goal is to restore the Indo-Pacific leopard shark—also known as the zebra shark (Stegostoma tigrinum)—to reefs where they have disappeared.

Unlike traditional conservation efforts that focus solely on habitat protection, ReShark uses a proactive approach to repopulate the ocean. This involves a global collaboration between the IUCN Shark Specialist Group, Conservation International, the Association of Zoos and Aquariums and 105 partner institutions across 20 countries.

A Fresh Model for Marine Conservation

Rewilding has been a successful strategy on land for decades—seen in the recovery of wolves in Yellowstone or the California condor—but it is a first for sharks in the ocean. The ReShark initiative employs a unique scientific process to ensure the survival of the species:

• Aquarium Partnerships: The project repurposes surplus eggs from aquariums.
• International Translocation: For the first time, sharks bred in aquaria are translocated internationally to support wild recovery.
• Local Hatcheries: Eggs are transported across oceans and reared in locally managed hatcheries.
• Community Stewardship: The project relies on a community of Indonesian conservationists, including students, villagers, and trained “shark nannies,” to ensure long-term sustainability.

Success in Raja Ampat: The Misool Marine Reserve

The Misool Marine Reserve was selected as the first release site for the project due to its exceptional protection levels. The 300,000-acre reserve is managed by the Misool Foundation and the Misool Ranger Patrol, who conducted 1,200 patrol trips in 2024 alone.

The reserve has already proven that nature can rebound when given the chance. Since 2012, shark numbers within the reserve have increased by 190%, and fish biomass in No-Capture Zones has surged by 250%. To date, seven endangered leopard sharks have been reintroduced into the wild through the ReShark program.

The Broader Impact: Ecology and Economy

The restoration of zebra sharks isn’t just a win for biodiversity; it’s a strategic move for the region’s economy. George Yarangga, Acting Mayor of Sorong, has noted that increasing the shark population in West Papua waters is expected to create a “domino effect,” attracting more tourists to Raja Ampat and improving the economy for local people involved in the tourism sector.

Key Takeaways: ReShark Project at a Glance

Looking Forward

By blending genetics, local stewardship, and international collaboration, ReShark is attempting to create a scalable model for reversing extinction in the ocean. As more leopard sharks are released and the Misool Marine Reserve continues to thrive, this project may serve as the blueprint for restoring other lost marine species across the globe.