The first farms established in the region relied on collecting adult and juvenile oysters from the reefs. This approach quickly failed due to the lack of adequate natural resources.

The First Hatcheries and Their Challenges

A private hatchery operated in Majuro (Marshall Islands) from 1998 to 2001, temporarily supplying two commercial pearl farms. However, technical problems — both in the hatchery and in the nursery — soon compromised its success.

Following this setback, the governments of the Federated States of Micronesia and the Marshall Islands established three hatcheries of various sizes and objectives, some with a research focus. These hatcheries are located at the College of Micronesia – Land Grant Program (Ponape), the College of the Marshall Islands (Majuro), and Kailua-Kona, where a commercial and experimental facility still operates today. Another hatchery dedicated exclusively to research operates at the University of Hawaii-Hilo.

The problems encountered were not solely due to infrastructure or basic technique but also to the consistency and reliability of production.

The Collaborative Alliance: A Collective Response

To address these challenges, the Collaborative Alliance — a network of aquaculture professionals — launched a project entitled “Filling the Gaps to Ensure the Viability of Small-Scale Tropical Mariculture Enterprises in Hawaii and the U.S.-Affiliated Islands.” Its objective: to analyze hatchery techniques on a regional scale and identify the main obstacles limiting production success.

Project partners are simultaneously conducting research to design new methods to overcome existing problems.

A Technique Now Operational but Still Being Refined

The basic hatchery technique for Pinctada margaritifera is now well established and supports the development of pearl farming across the Pacific. However, some challenges remain: researchers are working to improve larval rearing and nursery grow-out methods in order to increase profitability and production reliability.

They are also studying the seasonality of black-lipped oyster spawning to make spawning induction more reliable.

Biological and Economic Challenges

Oyster metamorphosis remains a long and unpredictable process, while early mortalities continue to occur sporadically and are poorly understood. The grow-out period requires significant labor and suffers heavy losses, particularly due to predation by Cymatium snails.

Researchers are currently exploring solutions to improve both sea-based and land-based grow-out. At the same time, a bioeconomic study of Micronesian farms and hatcheries is evaluating the cost-effectiveness of each step, from hatchery to nursery. The first results of this research will be published soon.