Nacre characterization of pearl oysters Pinctada margaritifera from Arakan waters, North Sulawesi, Indonesia

Mother of pearl inside the pearl oyster Pinctada margaritifera was studied to provide information on the diversity of the aragonite microtablets and their biomineral compositions. This information can be used to reveal the specific characters of the nacre of the oyster from North Sulawesi coastal waters and as a basis for the oyster size selection in pearl culture. Thirty samples of oysters from Arakan waters had been prepared for their shells and then the nacre layer was analyzed using Scanning Electron Microscope and Energy Dispersive X-Ray Spectroscope. Results showed that the nacre-composing microtablets varied with shell size, with thickness of 0.36-0.90 μm. The maximum thickness was found in P. margaritifera of 80-90 mm shell length. The biomineral composition contained in the tablet is Ca>Mo>Na>Al>Mg>Se>Fe>Mn>Cr.

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