Formation of the Pearl Layer on Pearls in Triploid Japanese Pearl Oyster, Pinctada fucata martensii

Abstract

This study compared formation of the pearl layer on pearls in diploid and triploid Japanese pearl oyster, Pinctada fucata martensii. Triploid oysters had lower enzyme activities, number of hemocyto and high concentration of dissolved oxygen in serum but higher formation of the pearl layer on pearls in autumn, coinciding with the period of growth arrest and sexual maturation of diploids.