Abstract
In the present experiment, the pearls were cultivated by operations of different subdivisional mantle pieces. The mantle pieces used for this experiment were the anterior, the middle and the posterior ones on both mantles (Fig. 1) of Pinctada martensii, which was obtained at Hiwasa, Tokushima Prefecture. The results of the experiment are shown in Table 1 and Fig. 2. The socalled thin-layered pearls may often be originated from cultures by the anterior and the posterior pieces on both sides. At least, one of the factors forming thin-layered pearls seems to be caused by the operated piece itself. Therefore, the piece, sectioned off near the middle regions in the mantle line on both sides, must be employed to produce the pearl of good quality.
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