Laila Shaaban stood on the shore of the Farasan Islands as Prince al-Dhiwaini’s call rang out—"Al Dhiwaini!"—and hundreds surged into the Red Sea, nets in hand, chasing parrotfish that seemed to swim willingly into their grasp. In that moment, the line between scientist and participant blurred. As a Saudi marine biology Ph.D. student, Shaaban had spent six years studying ocean decline, yet here, amid the annual hareed festival, she felt the pull of tradition as powerfully as the tide. Each fisher hauled in up to 78 kilograms (172 pounds) of longnose parrotfish (Hipposcarus harid), a spectacle rooted in lunar cycles and centuries of cultural memory.
The hareed aggregation—occurring just after the full moon and lasting five days, typically between late March and early April—has no known scientific parallel. While reef fish rarely migrate more than a few hundred kilometers, some Farasan elders insist these fish journey all the way from India. Science says otherwise: marine ecologist Dr. Renato Morais notes that such a trek would span over 4,500 kilometers (2,800 miles) of shallow coastline, a distance no parrotfish species is known to cover. Dissections of 10 festival-caught fish revealed no signs of migratory stress, deepening the mystery. Yet it’s in this space—between local knowledge and scientific skepticism—that the most vital insights emerge.
The festival itself has evolved. Once an open harvest, it’s now managed by municipal authorities who herd the fish into holding cages for four days before releasing them for the public event. This shift, in place for just 22 years, raises urgent questions. Could the aggregation’s predictability be masking a deeper crisis? Dr. Morais warns of "hyperstability"—a phenomenon where fish continue gathering densely even as overall populations decline, giving a false impression of abundance. Without long-term data, it’s impossible to know how much the hareed population has changed, but the risk is real.
Still, the festival endures as a rare bridge between ecological knowledge systems. The people of Farasan have tracked the hareed by moonlight for generations, long before Western science mapped the Red Sea. Now, as marine ecosystems face unprecedented stress, their wisdom offers more than cultural richness—it offers clues. By weaving together elders’ observations, lunar calendars, and modern marine biology, researchers may finally unravel the hareed’s secrets. And in doing so, they might just find better ways to protect not only this fish, but the many other species whose lives remain partly hidden from science.
The answer may not lie in a lab or a legend, but in the space where both meet—on the shore, under the full moon, where tradition and curiosity dive into the same sea.