Study on environmental restoration in enclosed water using the pearl oyster, Pinctada fucata martensii: Laboratry study of the oyster's feeding and shell activities
2008
Kawai, H.(Nagasaki-ken. Inst. of Public Health and Environmental Sciences (Japan)) | Uchida, H. | Kasuya, T. | Yamaguchi, H.
The coexistence of both the environmental restoration in bay and the pearl production of high quality with performing the aeration from the bottom of the sea in pearl farming is the main object of our study. The quality of the pearl is decided by the synthesis of each element, and the size of the pearl and the thickness of the nacreous layer are elements of the pearl quality together. The size of the pearl and the thickness of the nacreous layer are affected by feeding activity of the pearl shell. Therefore, in this study, we examined a change of feeding activity of a pearl shell under the varied DO (dissolved oxygen) concentration, because the DO concentration is influenced by aeration directly. On the other hand, it is known that shell activity of the pearl shell changes with an environmental change. We examined the change of shell activity as well as the change of feeding activity under the varied DO (dissolved oxygen) concentration to consider whether the change of shell activity was possible for an index of feeding activity. As a result, we were able to clarify relations of DO concentration, feeding activity and shell activity, especially there were a threshold of shell activity between 0.5 to 1.5 mg/L DO.
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