挿核施術に使用する外套膜片(ピース)の採取部位によるアコヤガイの養殖真珠の品質の相違について

抄録

In pearl culture, a graft tissue cut from the mantle of a pearl oyster is inserted into the body of the oyster together with a nucleus. The aim of the present experiments was to examine whether or not anatomical parts of the mantle from which graft tissues had been taken would have any effect on the quality of the pearl developed later in the body.
In the experiments the graft tissue was obtained from different sides of the mantle, the right and the left, each side divided into series of A, B, and C, with subdivisions I, II, and III (Fig. 1). The operated oysters were cultured in an area of Ago Bay for about four months till December 1954. The subsequent inspection, comparing the developed pearls in association with the graft tissues from the specific areas revealed:
1. In producing thicker layers of the pearl in term of weight, the graft tissues from the right side of the mantle was better than the ones from the left; A series of the tissue were as good as B series and better than C, the tissues from area III were the best followed by the tissues from areas II and I in this order (Table 1).
2. The occurring frequency of colored pearls differed between the graft tissues from each other side of the mantle, but did not among the tissues from other subdivisions of the mantle (Table 3).
3. The occurring frequency of lustrous pearls varied between these tissues compared with each other: A and C, III and II, III and I; but no differences was apparent between any other pair of the comparison.