Studies on the Relationship between the Qualities of Cultured Pearls and Culture-II

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Continued from the former experiments, the authors studied the relationship between the qualities of cultured pearls and the culture depth in Hamajima Bay, Matoya Bay and Kagami Ura, Mie Prefecture, the hydrographical conditions of which differ remarkably with one another (Figure 1). After nucleusinsertion pearl oysters, Pinctaaa martensii (DUNKER), were transported to those three bays and cultured for 4 months from August, 1953, at the depth of 1, 2, 3, 4, 5, and 6 meters below the sea surface. On December, 1953, pearls were harvested and their qualities were examined by visual inspection. The results were as follows. 1) In all the three bays, the rate of appearance of yellowish pearls was larger in shallower zones (1, 2 and 3 meters), that of pinkish and splendidly lustered pearls being larger in deeper zones (4, 5, and 6 meters). (Table 1, 2 and 3). 2) The results agree fairly well with those of the former experiments. 3) The light intensity is stronger and water temperature is higher in the shallower zones in which the former seems especially to affect the pearl oysters to produce yellow pigment more, consequently yellowish pearls more than in the deeper zones. 4) Less variations of water temperature and specific gravity may be the causes of forming pinkish and splendidly lustered pearls in the deeper zones.
社団法人日本水産学会の論文