In French Polynesia, a narrow channel in the Fakarava Atoll has become a focus of scientific interest for its role in supporting a large population of grey reef sharks. This area, less than a mile long, serves as a central hub for around 500 sharks, providing space for mating, giving birth, feeding, and cleaning.
Yannis Papastamatiou, associate professor of biological sciences at Florida International University (FIU) and marine researcher in the Institute of Environment, explained that traditional conservation strategies often struggle to protect animals like sharks that move across vast ocean areas. However, he suggests that focusing on “super-habitats” such as the Fakarava channel may be more effective. According to Papastamatiou: “By safeguarding these unique corridors, we could protect a disproportionately large number of sharks and ensure the continuity of their entire life cycle in a relatively small area.”
Researchers used underwater observation and biologgers—tracking devices attached to the animals—to study how the sharks use the channel. They found that nearly all critical behaviors occur within this stretch: feeding, resting in tidal currents, mating (evidenced by females with fresh wounds), and even giving birth. The team captured rare footage of a shark pup being born and observed many sharks visiting cleaning stations where smaller fish remove parasites. Some tagged individuals spent up to 90% of their time within the channel.
Papastamatiou noted: “We don’t know how rare these super-habitats are. Fakarava channel may be unique, but I suspect there are others. Super-habitats are never going to replace the need for large protected areas, but they should definitely be included in conservation planning and efforts.”
The Fakarava channel forms part of a broader protected zone and is included in a UNESCO World Heritage Biosphere Reserve. Its effectiveness as shark habitat is linked to abundant prey fish populations, oxygen-rich water from tidal currents, and suitable resting spots for sharks. Researchers recommend searching for similar habitats elsewhere as part of future conservation efforts.
