The Hawaiian black-lipped pearl oyster (Pinctada margaritifera galtsoffi) is a unique subspecies, distinct from the famous Tahitian pearl oyster. Once abundant, it was traditionally used by Native Hawaiians to make fishhooks, lures, ornaments, and various tools.

Since the arrival of settlers, this oyster has been subjected to heavy commercial fishing pressure, leading to a dramatic decline in its populations. The last significant stocks, located in the reefs of Pearl and Hermes, disappeared in the 1920s after more than 100 tons of shells were harvested.

Recent observations are alarming: eighteen hours of diving yielded only 30 adult oysters, all more than 20 cm in diameter — a sign of virtually nonexistent recruitment.

Persistent Threats Despite Protection

Despite their protected status, the remaining stocks continue to dwindle, particularly in Kaneohe Bay. Population recovery is hindered by:

• Increased reef predation
• Poaching by divers
• Pollution of reef and lagoon areas
• Short viability of larvae in open culture systems

The oysters remain vulnerable to fish, octopuses, and predators such as Cymatium. Even protective cages have not been sufficient to safeguard them effectively.

A Natural and Innovative “Breeding Center”

The best strategy to replenish stocks would be to create breeding reserves bringing together large adult oysters to synchronize spawning and achieve high fertilization rates. The resulting larvae could then be carried by currents and naturally settle throughout the archipelago.

Interestingly, a commercial pearl farm can serve this role as a breeding center. With this goal in mind, Black Pearls Inc. (BPI) is developing the first Hawaiian pearl farm combining commercial production with a conservation tool.

A Historic Success

After participating in the revision of legislation on marine concessions, BPI obtained a 30-hectare concession near Honolulu International Airport. In 2003, the company harvested the first authentic Hawaiian Pearls™.

Today, a distinctive local range of pearls and mother-of-pearl jewelry is offered, giving Native artisans the opportunity to once again work with their ancestral material and adding a unique romantic charm to the islands.