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The study on fresh water pearl culture is growing as a source of employment and income in many
countries including India. A pearl has structural and chemical properties similar to the pearl nacre
of the shell interior. Its shape is determined by the irritant foreign body and its quality by the nature
of secretion of pearl sac thus the outer epithelium of the mantel tissue is the keynote in the
“orchestra” of bio-mineralization of pearl (Simkiss and Wada 1980). Fresh water mollusks like,
Lamellidens marginalis, Lamellidens corrianus produce pearl. The species Parreysia corrugata is
also commonly found abundantly in fresh water resources of Nanded, Maharashtra. It also secret
nacre and able to produce pearl. Considering the importance of pearl in human life the species,
Parrysia corrugata selected for the study.
Key words: Parreysia corrugata, Nacre secretion, temperature.