A Method of Selecting Parent-shells of the Pearl oyster, <I>Pinctada fucata martensii</I>, for Use as Piece Oysters Based on the a-value of the Pearl Layer

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The a-value in the pearl layer of the pearl oyster <I>Pinctada fucata martensii</I>, which is used as an indicator for selecting parent-shells, was measured by colorimetry method in June, 2004, and selected parent-shells were used in seed production. Seeds were then used in culture experiments at Nagasaki Prefectural Institute of Fisheries from Nov. 2004 to Dec. 2006. The purpose was to establish a method of producing sacrificed pearl oysters for graft (piece oyster) that produce high-quality pearl. The a-values in pearl layers and pearl qualities produced from piece oysters with parents from the plus field a-value [a(+)] group were compared with those from the minus field a-value [a(-)] counterpart. The a-values in pearl layers of seeds produced from the a(+) group were higher than values obtained from those of the a(-) group. Rates of production of pearls with white object color and pink interference color were significantly higher in the a(+) groups than those in the a(-) groups. Commercial values of pearls produced from the a(+) groups were 1.38-1.52 times higher than those of pearls obtained from the a(-) groups. Above results suggest that the a-value in the pearl layer is an effective indicator and selecting parent oysters with plus field during seed production can result in improved pearl quality.
日本水産増殖学会の論文