The program of research and development on the reconstruction support from the Great East Japan Earthquake on the base of the collaboration of college of technology was conducted using micro bubble technology for the water purification and the recovery of oyster culture in Ofunato Bay. The compact, lightweight and energy-saving devices having instrumentation system of 104 micro bubble generators were developed to carry out the purification and the culture. The micro bubbles in Takonoura water area of Ofunato Bay were supplied continuously during 8 months. Oyster growth-promoting was achieved by the supply of micro bubbles in Ofunato Bay and a new cultivation method of the oyster using micro bubble technology was found by the growth.